What is body fat? Solution Body fat is the total fat content in the body . Biochemically body fat is adipose tissue, coposed of adipocytes. Humans have two kinds of adipose tissues, White adipose tissue and Brown adipose tissue White adipose tissue is mainly composed of Lipids, i.e triglycerides. Brown tissue is generally negligible. and are major store houses or energy dumps, provide cushions to your internal organs, and insulation to the body from heat and cold..