Persistent Organic PollutantsNO-POPsNCT02675101
Nuts and Olestra for Persistent Organic Pollutant Reduction (NO-POPs) Trial
A study testing Whole Nuts, Olestra: Fat Free Pringles and Vegetable Oil: Original Pringles in people with Persistent Organic Pollutants and Endocrine Disrupting Chemicals, run by University of California, San Diego at 1 site in United States.
Trial summary
Persistent organic pollutants (POPs) are mostly fat-soluble halogenated chemicals with very long half-lives. POPs are endocrine disruptors, associated with increased risk for diabetes, alterations in thyroid function, and cardiovascular disease in humans. Read more about this study
- Who is it for?
- Ages 45 to 70 yearsHealthy volunteers can take part
- Conditions the study is for
- Persistent Organic Pollutants, Endocrine Disrupting Chemicals, Endocrine Disruptor Effects
- What is being tested?
- Whole Nuts, Olestra: Fat Free Pringles and Vegetable Oil: Original Pringles
- Could I receive a placebo?
- Yes, some participants may receive a placebo
- How many people
- 45 participants
- Where
- 1 siteUnited States
- Study dates
- Mar 2016to 1 Apr 2019
- Phase
- Interventional
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 45 to 70 years
- All sexes
- Healthy volunteers accepted
- Adult, Older adult
Who may be able to join
- Reside in the San Diego area
- BMI ≥18.0 kg/m2 and ≤30 kg/m2
- Non-smoker
- Willing and able to participate in clinic visits, bi-monthly supply pick-up, telephone and Internet communications at specified intervals
- Able to provide data through questionnaires and by telephone
- Willing to maintain contact with the investigators for 6 months
Show all 10Show fewer
- Willing to allow blood collections
- Willing to provide stool samples
- No known allergy to tree nuts
- No digestive issues with olestra, chips, or nuts
Who cannot join
- Nut allergies
- Smoker
- Diabetes, kidney disease or liver disease
- Concurrent acute or chronic gastro-intestinal conditions (e.g. inflammatory bowel disease, irritable bowel syndrome, concurrent diarrhea from any cause)
- Familial hypercholesterolemia
- Clotting problems or use of Coumadin,
Show all 11Show fewer
- Inability to participate in physical activity because of severe disability
- History or presence of a co-morbid diseases for which diet modification may be contraindicated
- Self-reported pregnancy or breastfeeding or planning a pregnancy within the next year
- Currently actively involved in another diet intervention study or a weight loss program
- A history or presence of a significant psychiatric disorder or any other condition that, in the investigator's judgement, would interfere with participation in the trial
Trial locations and contacts
1 site in 1 country.
United States1 site
UCSD Moores Cancer Center
La Jolla, California, 92093
About this study
Official title: Nuts and Olestra for Persistent Organic Pollutant Reduction (NO-POPs) Trial: A Pilot Investigation
Persistent organic pollutants (POPs) are mostly fat-soluble halogenated chemicals with very long half-lives. POPs are endocrine disruptors, associated with increased risk for diabetes, alterations in thyroid function, and cardiovascular disease in humans. POPs concentrations increase with age because of their persistence, bioaccumulation and poor excretion. The almost ubiquitous presence of endocrine disrupting POPs in US adults is a substantial public health concern, particularly because there is no established treatment to reduce body concentrations of POPs. Most POPs are excreted in bile due to their lipophilic nature. However, a substantial amount is reabsorbed in the small intestine and returns to the blood stream (entero-hepatic circulation). The objective of this pilot study is to conduct a 6-month randomized controlled trial of Nuts and Olestra to enhance the excretion of POPs among 45 healthy adults aged 45 to 70 years with BMIs between 18-30 kg/m2. This study has 3 treatment arms: A) Whole nuts with high fat content (almonds and walnuts; 110g total/day, n=15), B) Olestra: Fat Free PringlesTM potato chips (≈29 crisps, 18g of Olestra/day; n=15), C) Vegetable oil: Original PringlesTM potato chips (≈29 crisps, 17.4g of oil/day; n=15). The investigators aim to measure change in concentrations of 24 POPs in feces after 4 days of treatment and in blood at 6 months.
Read the detailed description
Persistent organic pollutants (POPs) are mostly fat-soluble halogenated chemicals with very long half-lives. POPs are endocrine disruptors, and have been associated with increased risk for diabetes, alterations in thyroid function, hypertension, dyslipidemia and neurobehavioral alterations in studies of children, and adults including the elderly. Some of the most prevalent POPs include organochlorine pesticides, polychlorinated biphenyls (PCBs) and polybrominated diphenyl ethers (PBDEs).
Most POPs are excreted in bile due to their lipophilic nature. However, a substantial amount is reabsorbed in the small intestine and returns to the blood stream (entero-hepatic circulation). Two small clinical trials found that bile acid sequestrants (cholestyramine, cholestimide) enhanced the fecal excretion of organochlorines after 2-3 days of treatment and significantly lowered their blood concentrations at 6 months. One pilot trial reported decreases in blood PCB concentrations in adults after a 1 year treatment with fat-free potato crisps made with olestra, a non-absorbable synthetic fat, versus standard potato crisps. POPs were thought to bind to olestra and be excreted in the feces. Replication of this finding is needed. Nuts, could yield similar effects. Nuts are foods with high-fat content which are incompletely absorbed in the intestine (21-24% of calorie not absorbed).
As people age, the body burdens of POPs increase. The almost ubiquitous presence of endocrine disrupting POPs in US adults is a substantial public health concern, particularly because there is no established treatment to reduce body concentrations of POPs. There is potential for dietary interventions to have an important role in the reduction of POPs at a population level due to their and low cost and wide use.
The investigators aim to measure 24 POPs (9 OC pesticides, 10 PCBs, 5 PBDEs) in blood (all participants) and in stool samples (only in a subset of 10 participants per treatment arm) before and during the treatment period. The specific aims of this pilot study are to:
- Assess the effectiveness of recruitment strategies, acceptance and compliance of the treatment arms, and establishing the feasibility of conducting a larger trial.
- Conduct preliminary testing of the hypotheses: Consumption of olestra (fat free Pringles): A) increases the fecal content (excretion) of POPs, and B) decreases blood levels of POPs, compared to the control arm (standard crisps).
- Conduct preliminary testing of the hypotheses: Consumption of nuts: A) increases the fecal content (excretion) of POPs, and B) decreases blood levels of POPs, compared to the control arm (standard crisps).
- Conditions
- Persistent Organic Pollutants, Endocrine Disrupting Chemicals, Endocrine Disruptor Effects
- Being tested
- Whole Nuts, Olestra: Fat Free Pringles, Vegetable Oil: Original Pringles
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Whole NutsOther
Participants will be advised on maintaining an iso-caloric diet. Aside consuming nuts, the remaining composition of the prescribed diet will be based on individual preferences. During the 6-month intervention, study subjects will meet with study staff every 2-3 weeks to weigh in, pick up food supplies and complete a questionnaire on compliance. All participants will have contact with the project coordinator/study dietitian a minimum of every 1-2 weeks either in-person, telephone, email and text message contacts for support, behavioral guidance and strategies. Both walnuts and almonds will be provided to participants in the whole nut study arm.
Olestra: Fat Free PringlesOther
Participants will be advised on maintaining an iso-caloric diet. Aside consuming fat free potato crisps, the remaining composition of the prescribed diet will be based on individual preferences. During the 6-month intervention, study subjects will meet with study staff every 2-3 weeks to weigh in, pick up food supplies and complete a questionnaire on compliance. All participants will have contact with the project coordinator/study dietitian a minimum of every 1-2 weeks either in-person, telephone, email and text message contacts for support, behavioral guidance and strategies. Fat Free Pringles will be provided to participants in the olestra study arm.
Vegetable Oil: Original PringlesOther
Participants will be advised on maintaining an iso-caloric diet. Aside consuming potato crisps, the remaining composition of the prescribed diet will be based on individual preferences. During the 6-month intervention, study subjects will meet with study staff every 2-3 weeks to weigh in, pick up food supplies and complete a questionnaire on compliance. All participants will have contact with the project coordinator/study dietitian a minimum of every 1-2 weeks either in-person, telephone, email and text message contacts for support, behavioral guidance and strategies. Original Pringles will be provided to participants in the vegetable oil study arm.
| Study group | Role | What they receive |
|---|---|---|
| Whole nuts | Active comparator | Participants will be advised on maintaining an iso-caloric diet by a Registered Dietitian. During the 6-month intervention, study subjects will consume a combination of whole almonds and walnut pieces, a total of 110 g per day. Participants will pick up supplies and be weighed 1-2 times per month for six months. Participants will also maintain a diary of their intake using an automated system. Walnuts and almonds will be provided to participants for the duration of the study. Receives: Other: Whole Nuts |
| Olestra: Fat Free Pringles | Experimental | Participants will be advised on maintaining an iso-caloric diet by a Registered Dietitian. During the 6-month intervention, study subjects will consume 29 potato crisps per day, which is approximately 18 g olestra/day. Participants will pick up supplies and be weighed 1-2 times per month for six months. Participants will also maintain a diary of their intake using an automated system. Fat free Pringles will be provided to participants for the duration of the study. Receives: Other: Olestra: Fat Free Pringles |
| Vegetable Oil: Original Pringles | Placebo comparator | Participants will be advised on maintaining an iso-caloric diet by a Registered Dietitian. During the 6-month intervention, study subjects will consume 29 potato crisps per day, which is approximately 17.4 g oil/day. Participants will pick up supplies and be weighed 1-2 times per month for six months. Participants will also maintain a diary of their intake using an automated system. Original Pringles will be provided to participants for the duration of the study. Receives: Other: Vegetable Oil: Original Pringles |
What is being measured
The primary outcome is the main question the study is designed to answer.
Change in blood levels of persistent organic pollutants (POPS) in response to being assigned an olestra -enriched diet (fat-free Pringles) compared to a diet enriched with vegetable oil (original Pringles) over a 6-month period
Measured: 6 months
Change in fecal excretion of persistent organic pollutants (POPS) in response to being assigned an olestra -enriched diet (fat-free Pringles) compared to a diet enriched with vegetable oil (original Pringles) over a 6-month period
Measured: 6 months
Secondary outcomes (2)
Change in blood levels of persistent organic pollutants (POPS) in response to being assigned a nut-enriched diet compared to a diet enriched with vegetable oil (original Pringles) over a 6-month period
Measured: 6 months
Change in fecal excretion of persistent organic pollutants (POPS) in response to being assigned a nut-enriched diet compared to a diet enriched with vegetable oil (original Pringles) over a 6-month period
Measured: 6 months
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted5 Feb 2016 (estimated)
- Study startMar 2016
- Primary completionFeb 2017
- Study completion1 Apr 2019
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (59)Papers the sponsor has linked to this study.
- Other trials for Persistent Organic PollutantsStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase N/A
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- None (open label)
- Enrolment
- 45 participants (actual)
Sponsor and investigators
- Lead sponsor
- University of California, San Diego
- Sponsor type
- University, hospital or other
- Collaborators
- San Diego State University
- Responsible party
- Principal investigator, Jose R Suarez, University of California, San Diego
- Investigators
- Jose R Suarez, MPH, MD, PhD, Principal investigator, University of California, San Diego
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT02675101
- Sponsor's protocol ID
- 160096
- Acronym
- NO-POPs
- Status last verified
- Jul 2019
- First submitted
- 28 Jan 2016
- Last updated
- 5 Jul 2019
- Results posted
- No
- Data monitoring committee
- No
- Individual data sharing
- No
Publications
Contreras Lopez MC. Determination of potentially bioaccumulating complex mixtures of organochlorine compounds in wastewater: a review. Environ Int. 2003 Mar;28(8):751-9. doi: 10.1016/S0160-4120(02)00120-4.
PubMed 12605924Hinck JE, Norstrom RJ, Orazio CE, Schmitt CJ, Tillitt DE. Persistence of organochlorine chemical residues in fish from the Tombigbee River (Alabama, USA): Continuing risk to wildlife from a former DDT manufacturing facility. Environ Pollut. 2009 Feb;157(2):582-91. doi: 10.1016/j.envpol.2008.08.021. Epub 2008 Oct 11.
PubMed 18851891Dougherty CP, Henricks Holtz S, Reinert JC, Panyacosit L, Axelrad DA, Woodruff TJ. Dietary exposures to food contaminants across the United States. Environ Res. 2000 Oct;84(2):170-85. doi: 10.1006/enrs.2000.4027.
PubMed 11068931Schafer KS, Kegley SE. Persistent toxic chemicals in the US food supply. J Epidemiol Community Health. 2002 Nov;56(11):813-7. doi: 10.1136/jech.56.11.813.
PubMed 12388566Schecter A, Colacino J, Haffner D, Patel K, Opel M, Papke O, Birnbaum L. Perfluorinated compounds, polychlorinated biphenyls, and organochlorine pesticide contamination in composite food samples from Dallas, Texas, USA. Environ Health Perspect. 2010 Jun;118(6):796-802. doi: 10.1289/ehp.0901347. Epub 2010 Feb 10.
PubMed 20146964Schecter A, Haffner D, Colacino J, Patel K, Papke O, Opel M, Birnbaum L. Polybrominated diphenyl ethers (PBDEs) and hexabromocyclodecane (HBCD) in composite U.S. food samples. Environ Health Perspect. 2010 Mar;118(3):357-62. doi: 10.1289/ehp.0901345. Epub 2009 Oct 28.
PubMed 20064778Lee DH, Steffes MW, Sjodin A, Jones RS, Needham LL, Jacobs DR Jr. Low dose of some persistent organic pollutants predicts type 2 diabetes: a nested case-control study. Environ Health Perspect. 2010 Sep;118(9):1235-42. doi: 10.1289/ehp.0901480. Epub 2010 May 5.
PubMed 20444671Lee DH, Lee IK, Jin SH, Steffes M, Jacobs DR Jr. Association between serum concentrations of persistent organic pollutants and insulin resistance among nondiabetic adults: results from the National Health and Nutrition Examination Survey 1999-2002. Diabetes Care. 2007 Mar;30(3):622-8. doi: 10.2337/dc06-2190.
PubMed 17327331Patterson DG Jr, Wong LY, Turner WE, Caudill SP, Dipietro ES, McClure PC, Cash TP, Osterloh JD, Pirkle JL, Sampson EJ, Needham LL. Levels in the U.S. population of those persistent organic pollutants (2003-2004) included in the Stockholm Convention or in other long range transboundary air pollution agreements. Environ Sci Technol. 2009 Feb 15;43(4):1211-8. doi: 10.1021/es801966w.
PubMed 19320182Smith D. Worldwide trends in DDT levels in human breast milk. Int J Epidemiol. 1999 Apr;28(2):179-88. doi: 10.1093/ije/28.2.179.
PubMed 10342677Centers for Disease Control and Prevention. Fourth National Report on Human Exposure to Environmental Chemicals. Atlanta, GA: Centers for Disease Control and Prevention; 2009. Available at: http://www.cdc.gov/exposurereport/pdf/FourthReport.pdf.
Eskenazi B, Chevrier J, Rauch SA, Kogut K, Harley KG, Johnson C, Trujillo C, Sjodin A, Bradman A. In utero and childhood polybrominated diphenyl ether (PBDE) exposures and neurodevelopment in the CHAMACOS study. Environ Health Perspect. 2013 Feb;121(2):257-62. doi: 10.1289/ehp.1205597. Epub 2012 Nov 15.
PubMed 23154064Hsu MS, Hsu KY, Wang SM, Chou U, Chen SY, Huang NC, Liao CY, Yu TP, Ling YC. A total diet study to estimate PCDD/Fs and dioxin-like PCBs intake from food in Taiwan. Chemosphere. 2007 Apr;67(9):S65-70. doi: 10.1016/j.chemosphere.2006.05.116. Epub 2007 Jan 9.
PubMed 17215025Tsutsumi T, Yanagi T, Nakamura M, Kono Y, Uchibe H, Iida T, Hori T, Nakagawa R, Tobiishi K, Matsuda R, Sasaki K, Toyoda M. Update of daily intake of PCDDs, PCDFs, and dioxin-like PCBs from food in Japan. Chemosphere. 2001 Dec;45(8):1129-37. doi: 10.1016/s0045-6535(01)00151-5.
PubMed 11695626Li J, Zhang L, Wu Y, Liu Y, Zhou P, Wen S, Liu J, Zhao Y, Li X. A national survey of polychlorinated dioxins, furans (PCDD/Fs) and dioxin-like polychlorinated biphenyls (dl-PCBs) in human milk in China. Chemosphere. 2009 May;75(9):1236-42. doi: 10.1016/j.chemosphere.2009.01.073. Epub 2009 Feb 28.
PubMed 19251302
Study at a glance
From the registry record, last updated by the sponsor on 5 Jul 2019. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Nuts and Olestra for Persistent Organic Pollutant Reduction (NO-POPs) Trial: A Pilot Investigation
- ClinicalTrials.gov ID
- NCT02675101
- Acronym / sponsor ID
- NO-POPs / 160096
- Conditions
- Persistent Organic Pollutants, Endocrine Disrupting Chemicals, Endocrine Disruptor Effects
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 45 participants (actual)
- Lead sponsor
- University of California, San DiegoUniversity, hospital or other
- Collaborators
- San Diego State University
- Study start
- Mar 2016 (actual)
- Primary completion
- Feb 2017 (actual)
- Study completion
- 1 Apr 2019 (actual)
- First posted
- 5 Feb 2016 (estimated)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
Persistent organic pollutants (POPs) are mostly fat-soluble halogenated chemicals with very long half-lives. POPs are endocrine disruptors, associated with increased risk for diabetes, alterations in thyroid function, and cardiovascular disease in humans. POPs concentrations increase with age because of their persistence, bioaccumulation and poor excretion. The almost ubiquitous presence of endocrine disrupting POPs in US adults is a substantial public health concern, particularly because there is no established treatment to reduce body concentrations of POPs. Most POPs are excreted in bile due to their lipophilic nature. However, a substantial amount is reabsorbed in the small intestine and returns to the blood stream (entero-hepatic circulation). The objective of this pilot study is to conduct a 6-month randomized controlled trial of Nuts and Olestra to enhance the excretion of POPs among 45 healthy adults aged 45 to 70 years with BMIs between 18-30 kg/m2. This study has 3 treatment arms: A) Whole nuts with high fat content (almonds and walnuts; 110g total/day, n=15), B) Olestra: Fat Free PringlesTM potato chips (≈29 crisps, 18g of Olestra/day; n=15), C) Vegetable oil: Original PringlesTM potato chips (≈29 crisps, 17.4g of oil/day; n=15). The investigators aim to measure change in concentrations of 24 POPs in feces after 4 days of treatment and in blood at 6 months.
Detailed description
Persistent organic pollutants (POPs) are mostly fat-soluble halogenated chemicals with very long half-lives. POPs are endocrine disruptors, and have been associated with increased risk for diabetes, alterations in thyroid function, hypertension, dyslipidemia and neurobehavioral alterations in studies of children, and adults including the elderly. Some of the most prevalent POPs include organochlorine pesticides, polychlorinated biphenyls (PCBs) and polybrominated diphenyl ethers (PBDEs).
Most POPs are excreted in bile due to their lipophilic nature. However, a substantial amount is reabsorbed in the small intestine and returns to the blood stream (entero-hepatic circulation). Two small clinical trials found that bile acid sequestrants (cholestyramine, cholestimide) enhanced the fecal excretion of organochlorines after 2-3 days of treatment and significantly lowered their blood concentrations at 6 months. One pilot trial reported decreases in blood PCB concentrations in adults after a 1 year treatment with fat-free potato crisps made with olestra, a non-absorbable synthetic fat, versus standard potato crisps. POPs were thought to bind to olestra and be excreted in the feces. Replication of this finding is needed. Nuts, could yield similar effects. Nuts are foods with high-fat content which are incompletely absorbed in the intestine (21-24% of calorie not absorbed).
As people age, the body burdens of POPs increase. The almost ubiquitous presence of endocrine disrupting POPs in US adults is a substantial public health concern, particularly because there is no established treatment to reduce body concentrations of POPs. There is potential for dietary interventions to have an important role in the reduction of POPs at a population level due to their and low cost and wide use.
The investigators aim to measure 24 POPs (9 OC pesticides, 10 PCBs, 5 PBDEs) in blood (all participants) and in stool samples (only in a subset of 10 participants per treatment arm) before and during the treatment period. The specific aims of this pilot study are to:
- Assess the effectiveness of recruitment strategies, acceptance and compliance of the treatment arms, and establishing the feasibility of conducting a larger trial.
- Conduct preliminary testing of the hypotheses: Consumption of olestra (fat free Pringles): A) increases the fecal content (excretion) of POPs, and B) decreases blood levels of POPs, compared to the control arm (standard crisps).
- Conduct preliminary testing of the hypotheses: Consumption of nuts: A) increases the fecal content (excretion) of POPs, and B) decreases blood levels of POPs, compared to the control arm (standard crisps).
Study design
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- None (open label)
- Number of arms
- 3
| Arm | Type | Receives |
|---|---|---|
| Whole nuts | Active comparator | Other: Whole NutsParticipants will be advised on maintaining an iso-caloric diet by a Registered Dietitian. During the 6-month intervention, study subjects will consume a combination of whole almonds and walnut pieces, a total of 110 g per day. Participants will pick up supplies and be weighed 1-2 times per month for six months. Participants will also maintain a diary of their intake using an automated system. Walnuts and almonds will be provided to participants for the duration of the study. |
| Olestra: Fat Free Pringles | Experimental | Other: Olestra: Fat Free PringlesParticipants will be advised on maintaining an iso-caloric diet by a Registered Dietitian. During the 6-month intervention, study subjects will consume 29 potato crisps per day, which is approximately 18 g olestra/day. Participants will pick up supplies and be weighed 1-2 times per month for six months. Participants will also maintain a diary of their intake using an automated system. Fat free Pringles will be provided to participants for the duration of the study. |
| Vegetable Oil: Original Pringles | Placebo comparator | Other: Vegetable Oil: Original PringlesParticipants will be advised on maintaining an iso-caloric diet by a Registered Dietitian. During the 6-month intervention, study subjects will consume 29 potato crisps per day, which is approximately 17.4 g oil/day. Participants will pick up supplies and be weighed 1-2 times per month for six months. Participants will also maintain a diary of their intake using an automated system. Original Pringles will be provided to participants for the duration of the study. |
Who may qualify
- Ages
- 45 to 70 years
- Sex
- All
- Healthy volunteers
- Accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (10 listed)
- Reside in the San Diego area
- BMI ≥18.0 kg/m2 and ≤30 kg/m2
- Non-smoker
- Willing and able to participate in clinic visits, bi-monthly supply pick-up, telephone and Internet communications at specified intervals
- Able to provide data through questionnaires and by telephone
Key exclusion criteria (11 listed)
- Nut allergies
- Smoker
- Diabetes, kidney disease or liver disease
- Concurrent acute or chronic gastro-intestinal conditions (e.g. inflammatory bowel disease, irritable bowel syndrome, concurrent diarrhea from any cause)
- Familial hypercholesterolemia
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Whole NutsParticipants will be advised on maintaining an iso-caloric diet. Aside consuming nuts, the remaining composition of the prescribed diet will be based on individual preferences. During the 6-month intervention, study subjects will meet with study staff every 2-3 weeks to weigh in, pick up food supplies and complete a questionnaire on compliance. All participants will have contact with the project coordinator/study dietitian a minimum of every 1-2 weeks either in-person, telephone, email and text message contacts for support, behavioral guidance and strategies. Both walnuts and almonds will be provided to participants in the whole nut study arm. | Other | Whole nuts |
| Olestra: Fat Free PringlesParticipants will be advised on maintaining an iso-caloric diet. Aside consuming fat free potato crisps, the remaining composition of the prescribed diet will be based on individual preferences. During the 6-month intervention, study subjects will meet with study staff every 2-3 weeks to weigh in, pick up food supplies and complete a questionnaire on compliance. All participants will have contact with the project coordinator/study dietitian a minimum of every 1-2 weeks either in-person, telephone, email and text message contacts for support, behavioral guidance and strategies. Fat Free Pringles will be provided to participants in the olestra study arm. | Other | Olestra: Fat Free Pringles |
| Vegetable Oil: Original PringlesParticipants will be advised on maintaining an iso-caloric diet. Aside consuming potato crisps, the remaining composition of the prescribed diet will be based on individual preferences. During the 6-month intervention, study subjects will meet with study staff every 2-3 weeks to weigh in, pick up food supplies and complete a questionnaire on compliance. All participants will have contact with the project coordinator/study dietitian a minimum of every 1-2 weeks either in-person, telephone, email and text message contacts for support, behavioral guidance and strategies. Original Pringles will be provided to participants in the vegetable oil study arm. | Other | Vegetable Oil: Original Pringles |
Primary outcome
Change in blood levels of persistent organic pollutants (POPS) in response to being assigned an olestra -enriched diet (fat-free Pringles) compared to a diet enriched with vegetable oil (original Pringles) over a 6-month period
Time frame: 6 months
Change in fecal excretion of persistent organic pollutants (POPS) in response to being assigned an olestra -enriched diet (fat-free Pringles) compared to a diet enriched with vegetable oil (original Pringles) over a 6-month period
Time frame: 6 months
2 secondary outcomes
Change in blood levels of persistent organic pollutants (POPS) in response to being assigned a nut-enriched diet compared to a diet enriched with vegetable oil (original Pringles) over a 6-month period
Time frame: 6 months
Change in fecal excretion of persistent organic pollutants (POPS) in response to being assigned a nut-enriched diet compared to a diet enriched with vegetable oil (original Pringles) over a 6-month period
Time frame: 6 months
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 5 Jul 2019.
- Background: PubMed 12605924Contreras Lopez MC. Determination of potentially bioaccumulating complex mixtures of organochlorine compounds in wastewater: a review. Environ Int. 2003 Mar;28(8):751-9. doi: 10.1016/S0160-4120(02)00120-4.
- Background: PubMed 18851891Hinck JE, Norstrom RJ, Orazio CE, Schmitt CJ, Tillitt DE. Persistence of organochlorine chemical residues in fish from the Tombigbee River (Alabama, USA): Continuing risk to wildlife from a former DDT manufacturing facility. Environ Pollut. 2009 Feb;157(2):582-91. doi: 10.1016/j.envpol.2008.08.021. Epub 2008 Oct 11.
- Background: PubMed 11068931Dougherty CP, Henricks Holtz S, Reinert JC, Panyacosit L, Axelrad DA, Woodruff TJ. Dietary exposures to food contaminants across the United States. Environ Res. 2000 Oct;84(2):170-85. doi: 10.1006/enrs.2000.4027.
- Background: PubMed 12388566Schafer KS, Kegley SE. Persistent toxic chemicals in the US food supply. J Epidemiol Community Health. 2002 Nov;56(11):813-7. doi: 10.1136/jech.56.11.813.
- Background: PubMed 20146964Schecter A, Colacino J, Haffner D, Patel K, Opel M, Papke O, Birnbaum L. Perfluorinated compounds, polychlorinated biphenyls, and organochlorine pesticide contamination in composite food samples from Dallas, Texas, USA. Environ Health Perspect. 2010 Jun;118(6):796-802. doi: 10.1289/ehp.0901347. Epub 2010 Feb 10.
- Background: PubMed 20064778Schecter A, Haffner D, Colacino J, Patel K, Papke O, Opel M, Birnbaum L. Polybrominated diphenyl ethers (PBDEs) and hexabromocyclodecane (HBCD) in composite U.S. food samples. Environ Health Perspect. 2010 Mar;118(3):357-62. doi: 10.1289/ehp.0901345. Epub 2009 Oct 28.
- Background: PubMed 20444671Lee DH, Steffes MW, Sjodin A, Jones RS, Needham LL, Jacobs DR Jr. Low dose of some persistent organic pollutants predicts type 2 diabetes: a nested case-control study. Environ Health Perspect. 2010 Sep;118(9):1235-42. doi: 10.1289/ehp.0901480. Epub 2010 May 5.
- Background: PubMed 17327331Lee DH, Lee IK, Jin SH, Steffes M, Jacobs DR Jr. Association between serum concentrations of persistent organic pollutants and insulin resistance among nondiabetic adults: results from the National Health and Nutrition Examination Survey 1999-2002. Diabetes Care. 2007 Mar;30(3):622-8. doi: 10.2337/dc06-2190.
- Background: PubMed 19320182Patterson DG Jr, Wong LY, Turner WE, Caudill SP, Dipietro ES, McClure PC, Cash TP, Osterloh JD, Pirkle JL, Sampson EJ, Needham LL. Levels in the U.S. population of those persistent organic pollutants (2003-2004) included in the Stockholm Convention or in other long range transboundary air pollution agreements. Environ Sci Technol. 2009 Feb 15;43(4):1211-8. doi: 10.1021/es801966w.
- Background: PubMed 10342677Smith D. Worldwide trends in DDT levels in human breast milk. Int J Epidemiol. 1999 Apr;28(2):179-88. doi: 10.1093/ije/28.2.179.
- BackgroundCenters for Disease Control and Prevention. Fourth National Report on Human Exposure to Environmental Chemicals. Atlanta, GA: Centers for Disease Control and Prevention; 2009. Available at: http://www.cdc.gov/exposurereport/pdf/FourthReport.pdf.
- Background: PubMed 23154064Eskenazi B, Chevrier J, Rauch SA, Kogut K, Harley KG, Johnson C, Trujillo C, Sjodin A, Bradman A. In utero and childhood polybrominated diphenyl ether (PBDE) exposures and neurodevelopment in the CHAMACOS study. Environ Health Perspect. 2013 Feb;121(2):257-62. doi: 10.1289/ehp.1205597. Epub 2012 Nov 15.
- Individual participant dataSharing planned: No
Related trials for Persistent Organic Pollutants
Not yet recruitingObservational study
Exposure to Persistent Organic Pollutants and Severity of Endometriosis in the ComPaRe-Endometriosis Cohort
Endometriosis
RecruitingObservational study
Exposure to Organochlorine Pollutants and Impact on Development in the Peripubertal Age in Guadeloupe
Prenatal Exposure, Postnatal Exposure
Recruiting
Persistent Organic Pollutants and Mechanical Discharge: Limiting the Impact of Bariatric Surgery Through Personalized Adapted Physical Activity
Obesity, Bariatric Surgery Candidate
Recruiting
Exploratory Evaluation of the Effect of Cholestyramine on Serum Levels of POPs in Obese Female Patients
Obesity, Abdominal, Diabetes
Active, not recruiting
Persistent Organic Pollutants and Breast Cancers (POPCASE)
Breast Cancer
Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Jose R Suarez, MPH, MD, PhD principal investigator
University of California, San Diego
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing Whole Nuts, Olestra: Fat Free Pringles and Vegetable Oil: Original Pringles in people with Persistent Organic Pollutants and Endocrine Disrupting Chemicals, run by University of California, San Diego at 1 site in United States.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 10 inclusion and 11 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 5 Jul 2019. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in United States. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. Some participants in this study may receive a placebo. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Change in blood levels of persistent organic pollutants (POPS) in response to being assigned an olestra -enriched diet (fat-free Pringles) compared to a diet enriched with vegetable oil (original Pringles) over a 6-month period (time frame: 6 months). The study lists 2 primary outcomes in all. It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT02675101, which also lists 59 linked publications.
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 5 Jul 2019.