i got some advice from some crazy guy that told me that my ball should be eating much bigger prey because of his length!!

i thought that you were supposed to feed something approximetly the size of the biggest part of their body.. correct me if im wrong.

i have a ball who was abandoned and is quite long 4.5 feet to be exact but hes really skinny, ive been getting him eating and gaining weight so do you think that i should give him prey that is WAYY bigger around than he is??

maby im wrong and this crazy person is right...
what are your thoughts?