Milk Fat Globule Membrane-Enhanced RUTF for Children With Severe Acute Malnutrition

Globally, approximately 15 million children are suffering from severe acute malnutrition (SAM) at any one time, a number that has not declined in recent decades despite significant technological advancements in agriculture and food science. SAM is a condition of total-body depletion of the nutrients required for health and development; without treatment, 50% of affected children will die. Whereas historically children with SAM were admitted to and treated within hospitals, the advent of ready-to-use therapeutic food (RUTF) and community-based management of acute malnutrition revolutionized SAM care by allowing it to occur safely and successfully by the child's caregiver in their own home.

RUTF was designed to provide the nutrients required for physical recovery in a safe, palatable format. It is equal parts peanut paste, sugar, vegetable oil, and skim milk powder, with added micronutrients and emulsifier. At inception, attention was not specifically paid to how RUTF's composition might impact neurodevelopmental recovery in children with SAM. Research over the past decade has revealed that even following successful treatment with RUTF, children diagnosed with SAM still score 1-3 standard deviations below age-based expectations on neurodevelopmental tests. This suggests that the nutrient profile of standard RUTF is not sufficient to recover the developmental damage incurred by SAM.

Recently, progress has been made toward improving the developmental trajectory of children with SAM by altering RUTF. A randomized, blinded trial in Malawi including 2,500 children with SAM showed that improving the polyunsaturated fatty acid (PUFA) profile of RUTF by reducing linoleic acid and adding docosahexaenoic acid (DHA) yields superior neurodevelopment 6 months after treatment, by 0.19 standard deviations on a standardized, culturally adapted neurodevelopmental test. This demonstrates that neurodevelopmental recovery in SAM is sensitive to the lipid profile of RUTF. Despite the benefits of improved PUFA RUTF, however, children with SAM remained 1 standard deviation below expectations in neurodevelopment.

The milk fat globule membrane (MFGM) in mammalian milk contains a host of nutrients and bioactive compounds supportive of physical health and brain development. Bovine MFGM added to infant formula has been tested in several clinical trials and has demonstrated a reduction in infectious episodes, such as diarrhea and ear infections, as well as improvement in cognitive development, compared with infant formula not containing MFGM. In these trials and others, MFGM has been shown to be safe and well-tolerated. Currently, RUTF contains skim milk powder as its high-quality protein source, and peanut and vegetable oils as the primary sources of fat. These vegetable fat sources are deficient in the lipids provided by MFGM: sphingolipids, cholesterol, and other phospholipids such as phosphatidylcholine and phosphatidylethanolamine, all of which play roles in brain development. It is possible that the lipids contained in MFGM may further support neurodevelopmental recovery in SAM children.

By acting as a natural emulsifier, MFGM also offers a food formulation advantage that is relevant to children with SAM. Animal model studies have demonstrated that emulsifiers can compromise the gut barrier. Children with SAM have damaged small intestinal barrier function, which can lead to translocation of gut bacteria and resulting systemic infection. As RUTF will compose nearly 100% of a child's intake for the duration of treatment - up to 3 months - it is possible that inclusion of emulsifier may impede gut healing and recovery. Considering this concern, the Manary lab ran a clinical trial in 2018-2019 testing a novel formulation of RUTF designed with oat in place of some skim milk powder and peanut, and without hydrogenated vegetable oil (standard emulsifier), because oat acts as a natural emulsifier. In this trial, children with SAM receiving the oat-RUTF had 10% absolute higher recovery and a 33% relative reduction in the worst SAM outcomes (death, hospitalization, or remaining severely malnourished). Like oat, MFGM in RUTF allows for omission of emulsifier and may yield similar benefits.

Given (1) the repeated finding that adding MFGM to infant formulas improves neurodevelopment, (2) the impaired neurodevelopment of children with SAM, (3) the current RUTF formulation lacking neuro-supportive fats provided by MFGM, (4) MFGM's natural activity as an emulsifier, and (5), the reality that RUTF provides the sole source of nutrition for children with SAM, it is plausible that adding this high-quality source of lipids and protein to RUTF may also benefit children with SAM in both immediate and long-term physical and cognitive recovery.

This will be an individually randomized, investigator/outcomes assessors-blinded, controlled clinical trial designed to determine if treatment of severely malnourished Sierra Leonean children 6-59-months of age with an RUTF made with MFGM-containing whey protein/fat concentrate will (1) improve neurodevelopment and (2) reduce a composite of poor SAM outcomes (death, hospitalization, remaining severely malnourished), compared with standard RUTF (S-RUTF). This trial will be conducted at 20 rural sites in Sierra Leone. 1600 children will be randomized 1:1 to receive 2 sachets per day of either MFGM-RUTF or S-RUTF. Children will receive their allocated RUTF and return to clinic fortnightly for repeat anthropometric measurements, illness questions, and to receive more RUTF until they achieve a clinical outcome or for a maximum of 12 weeks, at which point they will undergo Malawi Developmental Assessment Tool (MDAT) testing. Participants will be asked to return to clinic 6 (5-7) months later for MDAT testing, the global z-score from which will be the trial's co-primary outcome. A subset of participants will undergo blood spot and/or stool sample collection at the end of SAM treatment.