Isn’t it funny? I have to diet like a crazy person and exercise in order to be thin (I’ve fallen off the wagon and am now trying to crawl back on). And my husband can eat whatever and while I can’t say he never gains anything, he has had a modest weight gain over the past 33 years, and actually looks better at his current weight than he did at his younger weight.
I see more men with that metabolism than women tho. Not sure why, but likely something to do with child bearing.
I graduated high school 20 years ago, and at that time I weighed approximately 135 pounds. I pretty much stayed that way until just a few years ago when I had some modest weight gain where I “peaked” for most of the years at around 155 pounds. About 18 months ago, I quit smoking after nearly 19 years with the habit and within a week of quitting, I gained 5 more pounds. Those 5 pounds increased my waistline 3 inches. I went from a size 29 to a size 32.