It's really not that crazy to me, weight gain distribution is often localized rather than spread across the whole body. I've weighed around 145 for several years, but this year I somehow put on about 5 pounds. Since I'm ~6'1" I'm still skinny even at 150. But those 5 pounds all went to my waist, which means all the pants I have that used to fit well on the 32" waist I had 145 are now a bit snug on the 33" waist I have at 150.
i was not posting in reference to his specific post (i too will feel my pants getting tight if i gain 5 lbs), but rather the general attitude as expressed through his many posts about his weight.