find new ways to enjoy or prepare fresh fruits and veggies, get cardiovascular exercise, bonus points if in the sun for vitamin d, avoid stress when possible, sleep 7 hours when possible, avoid smoking, alcohol in excess, and other substances that put strain on your body. take care of yourself emotionally and find time to be with people you love. drink water!

no one will be able to do all of these perfectly always and it is normal to struggle attain most or even any. but they are more precise and beneficial targets than “gain or lose weight” and they have much more immediate and noticeable outcomes :)

In addition to what others have said, cut back on the sugar.

I would say most comes from eating a healthy diet and not smoking or drinking.

Also at least some movement throughout the day definitely helps.