I don't recall fat recruits either in basic training. Sure there were awkward, uncoordinated recruits, but not overweight.
I was super skinny in basic. Weighed 125 lbs and the guys ahead of me and behind me in my squad were both about 15 lbs overweight. Every single meal the DI’s would short them and give me their share. Ended up gaining 15 lbs in basic and then had a late growth spurt at about 19 where I finally filled out. Went in with 37 chest and 27 waist. 2 years later I had 41 chest and 29 waist.
Most young men now have been fed ADD meds because of feminist anti-boy teaching practices. Military won’t take kids with a history of psychoactive drugs.