I believe its because you mentioned a number that was supposedly large and even a small child could eat more pizza than that. 1500 calories isnt a lot to shout about in calorie terms. Hence lightweight.
QUOTE=Mentally;64509863]I said it in a playful, joking kind of way. The guy that responded to it earlier obviously could tell. Keep your wig on fair enough I was just acting like a uncivilised savage accusing you of stuff