I find it hard to take advice from skinny people. I have a relative who told us that she legit has a metabolic issue and stays very thin no matter what she eats. She has a heavy daughter who definitely did not inherit this metabolism. Thin people only know about their own body, imo! Fat people can tell you about what they managed to stick to for a short while.

There is a national study where you have to have kept a large amount of weight off for a long period of time. Advice from there is probably reliable. I think they say regular exercise and tracking.