Whey protein is commonly used to prevent muscle loss in older adults because it is easy to digest and provides high-quality protein. Researchers are now also exploring how whey protein may affect the gut microbiome, which plays an important role in overall health.
A study by Oregon State University explored whether taking whey protein regularly could help improve the balance and diversity of gut bacteria in older adults. To do this, researchers compared gut microbiome measurements taken before, during, and after whey protein supplementation.
What Did the Study Find?
The study found that whey protein supplementation led to changes in gut bacteria, especially in participants who started with lower gut diversity. In these individuals, overall bacterial diversity increased, and several bacteria commonly linked to gut health became more abundant, while some less favourable bacterial groups decreased. These changes appeared within days and, in some cases, lasted beyond the supplementation period. Despite these shifts in gut bacteria, participants did not experience clear changes in digestive symptoms.
These results suggest that whey protein isolate may help support a healthier gut microbiome in older adults, particularly for those with lower gut diversity to begin with.
If you are interested in further reading, you can read the full scientific article here.