Milk helped improve some signs of intestinal damage in a 2016 study of protein- and calorie-restricted pigs. Milk enriched with human lactoferrin improved several additional intestinal measures in that experiment. The findings do not show that milk treats malnutrition in children or people: the study was conducted in animals, not in a human clinical trial.
What the study tested
Garas and colleagues published the study “Milk with and without lactoferrin can influence intestinal damage in a pig model of malnutrition” in Food & Function in 2016. They used weaned pigs as a model of malnutrition, restricting protein and calories in their diet for five weeks. During the final three weeks, some pigs received cow’s milk, some received milk from transgenic cows expressing human lactoferrin, and a comparison group received no milk supplementation. The lactoferrin was present at levels reported as similar to those in human milk. The study abstract and bibliographic record are available on PubMed.
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The researchers assessed growth, blood chemistry and intestinal structure and function. After three weeks on the restricted diet, they reported changes that included atrophy of intestinal villi, greater intestinal permeability measured outside the body, and lower expression of tight-junction proteins.
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Both milk-supplemented groups had increased growth rate and calcium and glucose levels, and the researchers reported that milk promoted intestinal epithelial growth. In the jejunum—the middle section of the small intestine—the human-lactoferrin milk group also showed restored tissue morphology, reduced permeability and increased expression of the anti-inflammatory cytokine IL-10.
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The study authors concluded that cow’s milk stimulated repair of intestinal epithelial damage caused by protein and calorie restriction in this pig model, and that human-lactoferrin milk improved recovery to a greater extent. That conclusion applies to the experiment’s animals and measured outcomes, not to treatment effectiveness in people.
What the results mean for children and adults
This was an animal experiment, not a trial in malnourished children or adults. The milk was added to the diet of pigs already receiving restricted nutrition; it was not tested as a substitute for adequate food or as a stand-alone treatment. The findings therefore do not establish that ordinary retail milk, specially enriched milk, or lactoferrin supplements can reverse malnutrition in humans.
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A 2016 Chemistry World report quoted bioactive dietary peptides expert Hannu Korhonen describing the approach as a potential contribution to alleviating child malnutrition, particularly in developing countries. That was a comment on possible future relevance, not evidence that the intervention had helped children. Read the contemporaneous report.
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Practical takeaway
The experiment offers a research lead: milk components, including lactoferrin, may affect intestinal recovery under nutritional stress. It does not justify using milk or lactoferrin products to treat malnutrition. A person who may be malnourished needs assessment and appropriate nutritional care; this pig study cannot determine what treatment is safe or effective for them.
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