body weight

nouns

the weight of a person's body
body weight
is a type of (narrower)
the vertical force exerted by a mass as a result of gravity
weight
is an attribute of
having an (over)abundance of flesh
"he hadn't remembered how fat she was"
fat
is an attribute of
lacking excess flesh
"you can't be too rich or too thin"; "Yon Cassius has a lean and hungry look"-Shakespeare
lean, thin