Hello!
There are several factors that can determine a person's weight.
Their activity level is one of the biggest ones to talk about. When you are sedentary, or non active, your body isn't working off the fats that food provides us with, which can lead to the deteriation of many different muscles and weight gain.
In recent studies it has been said that weight can be a genetic factor, although it is only a small percentage of what attribute towards weight gain and issues.
Body composition is one of many different factors that affects our weight and how we hold it/show it. It's a combination of both fat and fat-free areas of the body.
So in conclusion, of the following, Heredity, Activity Level, and Body Composition are what affect a person's weight.
Hope this helps answer your question!
