This review is aiming to review and analysis the Prader -Willi Syndrome. The present review was conducted by searching in Medline, Embase, Web of Science, Science Direct, BMJ journal and Google Scholar for, researches, review articles and reports, published over the past years. Books published on the Prader-Willi Syndrome. If several studies had similar findings, we randomly selected one or two to avoid repetitive results. Based on findings and results this review found. The studies provided evidence that absolute TEE, REE, SEE, and AEE are lower in individuals with PWS than in age-, sex-, and body mass index–matched individuals without the syndrome. Alterations in lean body mass and lower physical activity amounts appear to be responsible ...