Possibly, I don't know what he knows, just like you don't know what I know. Knowledge is a vast and almost unlimited field.
Weight or body composition has no relation to knowledge, I could weigh 200kg or 50kg, would rally have no affect what so ever about what I know. Generally knowledge and body composition are not related unless you can somehow show me how they relate.
I find from past experience food intake and amount of exercise as well as age may have an affect on body composition, but may be ask Layne