08 Nov 2017 --- A component of dietary protein called phenylalanine can suppress appetite by affecting the release of appetite-regulating hormones in the gut, according to new research presented at the Society for Endocrinology annual conference in Harrogate, UK. The results of the study on mice show how phenylalanine reduces food intake by affecting the gut and the brain, and suggest that it may be used to prevent or treat obesity.