OverweightNCT00305097
Effects of Caffeinated and Decaffeinated Coffee on Body Weight and Glucose Tolerance
A study testing Decaffeinated coffee, Caffeinated coffee and No coffee in people with Overweight, run by National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) at 1 site in United States.
Trial summary
Habitual consumption of coffee may have substantial beneficial effects on glucose metabolism according to recent findings of epidemiological studies in the U.S., Europe, and Japan. However, data from longer-term human intervention studies with appropriate outcome measures are lacking. Read more about this study
- Who is it for?
- Ages 18 years and olderHealthy volunteers can take part
- Conditions the study is for
- Overweight
- What is being tested?
- Decaffeinated coffee, Caffeinated coffee and No coffee
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 45 participants
- Where
- 1 siteUnited States
- Study dates
- May 2006to Sep 2008
- 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 18 years and older
- All sexes
- Healthy volunteers accepted
- Adult, Older adult
Who may be able to join
- Aged at least 18 years with an ability and willingness to give written informed consent.
- Body mass index 25-35 kg/m2
- Users of at least 2 cups of caffeinated coffee per day who are willing to be randomized to any of the interventions.
- Non-smoking
Who cannot join
- Any condition/illness that may affect the study outcomes or would make participation potentially harmful such as pregnancy or breastfeeding, diabetes mellitus, heart disease, stroke, hypertension, malabsorption syndromes, Gastroesophageal reflux disease GERD, a history of ulcer, according to a detailed medical history.
- Abnormal hepatic function (liver function test > twice the normal range), abnormal renal function (creatinine > 1.1 mg/dl), fasting plasma glucose in the diabetic range (>/= 126 mg/dl), or blood pressure > 140/90 mmHg.
- Present alcoholism or drug abuse or use of medications that could interfere with the treatment including bronchodilators, quinolone antibiotics, monoamine oxidase inhibitors, anxiolytics, ranitidine, corticosteroids, growth hormone, antihypertensives.
Trial locations and contacts
1 site in 1 country.
United States1 site
Beth Israel Deaconess Medical Center
Boston, Massachusetts, 02215
About this study
Habitual consumption of coffee may have substantial beneficial effects on glucose metabolism according to recent findings of epidemiological studies in the U.S., Europe, and Japan. However, data from longer-term human intervention studies with appropriate outcome measures are lacking. We will study the effects of caffeinated and decaffeinated coffee consumption on body fatness, insulin sensitivity and glucose tolerance that may underlie the observed associations with a lower risk of type 2 diabetes in a randomized controlled trial. We hypothesize that both caffeinated and decaffeinated coffee will improve insulin sensitivity and glucose tolerance. Before starting a larger, long-term intervention study, we will conduct a pilot study to test the feasibility of such a trial. The pilot study will be an 8-week parallel trial in 45 overweight individuals, who will be randomized to drinking 5 cups per day of 1) caffeinated coffee (n=15), 2) decaffeinated coffee (n=15), or 3) water (n=15). Body fatness (weight, waist circumference, bioelectrical impedance), insulin sensitivity (HOMA model), and glucose tolerance (oral glucose tolerance test) will be the primary outcomes. We will assess the adherence of participants to their assigned treatment by measuring serum caffeine concentrations, documentation of coffee use in diaries by the participants, and counting unused coffee packets. We will also obtain feedback from participants on how to improve compliance in a future trial. If successful, this study will form the basis for a definitive trial of coffee consumption, body fatness, and glucose tolerance. Given the extensive use of coffee and the rapidly increasing health burden of type 2 diabetes, such a trial would have important public health implications.
Read the detailed description
Habitual consumption of coffee may have substantial beneficial effects on glucose metabolism according to recent findings of epidemiological studies in the U.S., Europe, and Japan. However, data from longer-term human intervention studies with appropriate outcome measures are lacking. We will study the effects of caffeinated and decaffeinated coffee consumption on body fatness, insulin sensitivity and glucose tolerance that may underlie the observed associations with a lower risk of type 2 diabetes in a randomized controlled trial. We hypothesize that both caffeinated and decaffeinated coffee will improve insulin sensitivity and glucose tolerance. Before starting a larger, long-term intervention study, we will conduct a pilot study to test the feasibility of such a trial. The pilot study will be an 8-week parallel trial in 45 overweight individuals, who will be randomized to drinking 5 cups per day of 1) caffeinated coffee (n=15), 2) decaffeinated coffee (n=15), or 3) water (n=15). Body fatness (weight, waist circumference, bioelectrical impedance), insulin sensitivity (HOMA model), and glucose tolerance (oral glucose tolerance test) will be the primary outcomes. We will assess the adherence of participants to their assigned treatment by measuring serum caffeine concentrations, documentation of coffee use in diaries by the participants, and counting unused coffee packets. We will also obtain feedback from participants on how to improve compliance in a future trial. If successful, this study will form the basis for a definitive trial of coffee consumption, body fatness, and glucose tolerance. Given the extensive use of coffee and the rapidly increasing health burden of type 2 diabetes, such a trial would have important public health implications.
- Conditions
- Overweight
- Being tested
- Decaffeinated coffee, Caffeinated coffee, No coffee
- Keywords
- coffee, caffeine, glucose tolerance, body weight, insulin sensitivity, randomized controlled trial
- Medical subject headings
- Overweight, Body Weight, Insulin Resistance
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Decaffeinated coffeeDietary supplement
Also called Instant Nestle decaffeinated coffee
5 cups per day for 8 weeks
Caffeinated coffeeDietary supplement
Also called Instant Nestle caffeinated coffee
5 cups per day for 8 weeks
No coffeeDietary supplement
| Study group | Role | What they receive |
|---|---|---|
| Caffeinated coffee | Experimental | Caffeinated coffee Receives: Dietary Supplement: Caffeinated coffee |
| Decaffeinated coffee | Experimental | Decaffeinated coffee Receives: Dietary Supplement: Decaffeinated coffee |
| No coffee | Active comparator | Not described Receives: Dietary Supplement: No coffee |
What is being measured
The primary outcome is the main question the study is designed to answer.
glucose tolerance / insulin sensitivity
Measured: 4 and 8 weeks
Secondary outcomes (1)
body weight/fatness, blood pressure, concentrations of blood lipids, adipokines, inflammatory markers
Measured: 4 and 8 weeks
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted21 Mar 2006 (estimated)
- Study startMay 2006
- Primary completionSep 2008
- Study completionSep 2008
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (3)Papers the sponsor has linked to this study.
- Other trials for OverweightStudies of the same condition, open and under way.
- More trials run by National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)The sponsor's other registered studies.
- 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
- Prevention
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Single blind
- Who is masked
- Investigator
- Enrolment
- 45 participants (actual)
Sponsor and investigators
- Sponsor type
- US National Institutes of Health
- Collaborators
- Harvard School of Public Health (HSPH), Beth Israel Deaconess Medical Center
- Responsible party
- Sponsor
- Investigators
- Rob M van Dam, PhD, Principal investigator, Harvard School of Public Health (HSPH)Christos Mantzoros, MD, Principal investigator, Beth Israel Deaconess Medical Center
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT00305097
- Sponsor's protocol ID
- DK46200 (completed)
- Other IDs
- P30DK046200
- Status last verified
- Mar 2018
- First submitted
- 20 Mar 2006
- Last updated
- 6 Mar 2018
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
Publications
Wedick NM, Brennan AM, Sun Q, Hu FB, Mantzoros CS, van Dam RM. Effects of caffeinated and decaffeinated coffee on biological risk factors for type 2 diabetes: a randomized controlled trial. Nutr J. 2011 Sep 13;10:93. doi: 10.1186/1475-2891-10-93.
PubMed 21914162Peter PR, Park KH, Huh JY, Wedick NM, Mantzoros CS. Circulating irisin levels are not affected by coffee intake: a randomized controlled trial. PLoS One. 2014 Apr 11;9(4):e94463. doi: 10.1371/journal.pone.0094463. eCollection 2014.
PubMed 24728416Wedick NM, Mantzoros CS, Ding EL, Brennan AM, Rosner B, Rimm EB, Hu FB, van Dam RM. The effects of caffeinated and decaffeinated coffee on sex hormone-binding globulin and endogenous sex hormone levels: a randomized controlled trial. Nutr J. 2012 Oct 19;11:86. doi: 10.1186/1475-2891-11-86.
PubMed 23078574
Study at a glance
From the registry record, last updated by the sponsor on 6 Mar 2018. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Effects of Caffeinated and Decaffeinated Coffee on Body Weight and Glucose Tolerance
- ClinicalTrials.gov ID
- NCT00305097
- Acronym / sponsor ID
- DK46200 (completed)
- Conditions
- Overweight
- Keywords
- coffee, caffeine, glucose tolerance, body weight, insulin sensitivity, randomized controlled trial
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 45 participants (actual)
- Lead sponsor
- National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)US National Institutes of Health
- Collaborators
- Harvard School of Public Health (HSPH), Beth Israel Deaconess Medical Center
- Study start
- May 2006 (actual)
- Primary completion
- Sep 2008 (actual)
- Study completion
- Sep 2008 (actual)
- First posted
- 21 Mar 2006 (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.
Habitual consumption of coffee may have substantial beneficial effects on glucose metabolism according to recent findings of epidemiological studies in the U.S., Europe, and Japan. However, data from longer-term human intervention studies with appropriate outcome measures are lacking. We will study the effects of caffeinated and decaffeinated coffee consumption on body fatness, insulin sensitivity and glucose tolerance that may underlie the observed associations with a lower risk of type 2 diabetes in a randomized controlled trial. We hypothesize that both caffeinated and decaffeinated coffee will improve insulin sensitivity and glucose tolerance. Before starting a larger, long-term intervention study, we will conduct a pilot study to test the feasibility of such a trial. The pilot study will be an 8-week parallel trial in 45 overweight individuals, who will be randomized to drinking 5 cups per day of 1) caffeinated coffee (n=15), 2) decaffeinated coffee (n=15), or 3) water (n=15). Body fatness (weight, waist circumference, bioelectrical impedance), insulin sensitivity (HOMA model), and glucose tolerance (oral glucose tolerance test) will be the primary outcomes. We will assess the adherence of participants to their assigned treatment by measuring serum caffeine concentrations, documentation of coffee use in diaries by the participants, and counting unused coffee packets. We will also obtain feedback from participants on how to improve compliance in a future trial. If successful, this study will form the basis for a definitive trial of coffee consumption, body fatness, and glucose tolerance. Given the extensive use of coffee and the rapidly increasing health burden of type 2 diabetes, such a trial would have important public health implications.
Detailed description
Habitual consumption of coffee may have substantial beneficial effects on glucose metabolism according to recent findings of epidemiological studies in the U.S., Europe, and Japan. However, data from longer-term human intervention studies with appropriate outcome measures are lacking. We will study the effects of caffeinated and decaffeinated coffee consumption on body fatness, insulin sensitivity and glucose tolerance that may underlie the observed associations with a lower risk of type 2 diabetes in a randomized controlled trial. We hypothesize that both caffeinated and decaffeinated coffee will improve insulin sensitivity and glucose tolerance. Before starting a larger, long-term intervention study, we will conduct a pilot study to test the feasibility of such a trial. The pilot study will be an 8-week parallel trial in 45 overweight individuals, who will be randomized to drinking 5 cups per day of 1) caffeinated coffee (n=15), 2) decaffeinated coffee (n=15), or 3) water (n=15). Body fatness (weight, waist circumference, bioelectrical impedance), insulin sensitivity (HOMA model), and glucose tolerance (oral glucose tolerance test) will be the primary outcomes. We will assess the adherence of participants to their assigned treatment by measuring serum caffeine concentrations, documentation of coffee use in diaries by the participants, and counting unused coffee packets. We will also obtain feedback from participants on how to improve compliance in a future trial. If successful, this study will form the basis for a definitive trial of coffee consumption, body fatness, and glucose tolerance. Given the extensive use of coffee and the rapidly increasing health burden of type 2 diabetes, such a trial would have important public health implications.
Study design
- Primary purpose
- Prevention
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Single blind (investigator)
- Number of arms
- 3
| Arm | Type | Receives |
|---|---|---|
| Caffeinated coffee | Experimental | Dietary Supplement: Caffeinated coffeeCaffeinated coffee |
| Decaffeinated coffee | Experimental | Dietary Supplement: Decaffeinated coffeeDecaffeinated coffee |
| No coffee | Active comparator | Dietary Supplement: No coffee |
Who may qualify
- Ages
- 18 years and older
- Sex
- All
- Healthy volunteers
- Accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (4 listed)
- Aged at least 18 years with an ability and willingness to give written informed consent.
- Body mass index 25-35 kg/m2
- Users of at least 2 cups of caffeinated coffee per day who are willing to be randomized to any of the interventions.
- Non-smoking
Key exclusion criteria (3 listed)
- Any condition/illness that may affect the study outcomes or would make participation potentially harmful such as pregnancy or breastfeeding, diabetes mellitus, heart disease, stroke, hypertension, malabsorption syndromes, Gastroesophageal reflux disease GERD, a history of ulcer, according to a detailed medical history.
- Abnormal hepatic function (liver function test > twice the normal range), abnormal renal function (creatinine > 1.1 mg/dl), fasting plasma glucose in the diabetic range (>/= 126 mg/dl), or blood pressure > 140/90 mmHg.
- Present alcoholism or drug abuse or use of medications that could interfere with the treatment including bronchodilators, quinolone antibiotics, monoamine oxidase inhibitors, anxiolytics, ranitidine, corticosteroids, growth hormone, antihypertensives.
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 |
|---|---|---|
| Decaffeinated coffeeAlso: Instant Nestle decaffeinated coffee5 cups per day for 8 weeks | Dietary supplement | Decaffeinated coffee |
| Caffeinated coffeeAlso: Instant Nestle caffeinated coffee5 cups per day for 8 weeks | Dietary supplement | Caffeinated coffee |
| No coffee | Dietary supplement | No coffee |
Primary outcome
glucose tolerance / insulin sensitivity
Time frame: 4 and 8 weeks
1 secondary outcome
body weight/fatness, blood pressure, concentrations of blood lipids, adipokines, inflammatory markers
Time frame: 4 and 8 weeks
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 6 Mar 2018.
- Results publication: PubMed 21914162Wedick NM, Brennan AM, Sun Q, Hu FB, Mantzoros CS, van Dam RM. Effects of caffeinated and decaffeinated coffee on biological risk factors for type 2 diabetes: a randomized controlled trial. Nutr J. 2011 Sep 13;10:93. doi: 10.1186/1475-2891-10-93.
- Derived from this study: PubMed 24728416Peter PR, Park KH, Huh JY, Wedick NM, Mantzoros CS. Circulating irisin levels are not affected by coffee intake: a randomized controlled trial. PLoS One. 2014 Apr 11;9(4):e94463. doi: 10.1371/journal.pone.0094463. eCollection 2014.
- Derived from this study: PubMed 23078574Wedick NM, Mantzoros CS, Ding EL, Brennan AM, Rosner B, Rimm EB, Hu FB, van Dam RM. The effects of caffeinated and decaffeinated coffee on sex hormone-binding globulin and endogenous sex hormone levels: a randomized controlled trial. Nutr J. 2012 Oct 19;11:86. doi: 10.1186/1475-2891-11-86.
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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.
Rob M van Dam, PhD principal investigator
Harvard School of Public Health (HSPH)
Christos Mantzoros, MD principal investigator
Beth Israel Deaconess Medical Center
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing Decaffeinated coffee, Caffeinated coffee and No coffee in people with Overweight, run by National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) 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 4 inclusion and 3 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 6 Mar 2018. 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. 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?
glucose tolerance / insulin sensitivity (time frame: 4 and 8 weeks). 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 NCT00305097, which also lists 3 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 6 Mar 2018.