After College, the exercise for the day became the walk to and from the parking lot, and the 6 steps down to my “garden level” apartment. Suddenly I was 175 lbs, then 185 lbs and then… I started working out and slowed the weight gain, and was able to direct some of that into muscle. I topped out at 195 for a few years.
Then I got married and someone else was cooking. I got to eat real food, not just mac-n-cheese with hotdogs! However, the down side was I immediately ballooned to 225 lbs. Even after I got rid of the woman, the weight remained. When I remarried, I was more careful about my eating habits, and have managed to keep my weight stable.