Yes. They think "big and strong", which only  refers to height, bone structure,  and muscle development, also refers to enormous sagging paunches and asses. Nadja Hermann , in her excellent book "Conquering Fat Logic" admits that this was the piece of fatlogic she most hated to part with : Her belief that at least her excess weight made her "strong". She was pleased and amazed to discover that when her BMI went to  a normal level, she GAINED strength, because her muscles were no longer atrophying under a layer of fat and flab.