Many athletes are concerned about their body image and composition. Here is a paper on body composition methods put forth by the working group on Body Composition Health and Performance under the International Olympic Committee Medical Commission.
Paper: Current Status of Body Composition Assessment in Sport, https://link.springer.com/article/10...00000000-00000
Diets are the way people seek to change their body composition. There are many different types of diets and it is often confusing for the general public and practitioners to determine their appropriateness. This paper provides the scientific evidence in a systematic way on several of the more popular diets.
Paper: International Society of Sports Nutrition Position Stand: Diets and Body Composition, https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5470183/