Body fat percentage is a measure of how much body fat you have relative to your lean body mass. Many people think that lean body mass refers only to muscle tissue, but it includes everything in your body that is not fat. This includes your organs, skin, bone, fluid levels, food weight, and stored glycogen.
We use a measure of lean body mass rather than total weight to assess each individual’s starting point and to create their initial nutrition plan. This is because body fat and lean body tissues do not have the same energy and nutrient requirements.
We use measures of lean body mass to set a calorie goal that encourages fat loss. It is also an important benchmark for setting protein intake, which will help to minimise muscle loss during a diet.