I managed to lose 40 pounds last year, using intermittent fasting. That impressed people, but what's impressed me is how easy it was to keep it off. I expected to have to do a lot more work than I have, I really seemed to have found a new 'set point', where I can simply let my body self-regulate eating and I won't gain weight. Sometimes it even goes down. I think a person's state of mind plays a huge role. I used IF…
Good point that laziness helps. Being busy helps. Eating only after exercising (I run ~3 miles daily) also helps.
Eating only once per day also helps to learn what food is good and bad for me. If hours after the meal I feel bad taste in my mouth - the food probably had a component that I should eat less. Sugar in big quantities is definitely once such bad component.