[yodsanklai]

Usually, it happens insidiously. After 30-40, metabolism slows down and it's easy to very slowly gain weight, even for people who didn't have weight issues before. Losing weight can be quite hard. To me the solution is to monitor my weight and avoid junk food as much as possible. I never drink soda, avoid fries. Sometimes you have no choice (e.g. traveling and no easy healthy options), then I try to only eat once or twice a day.