That second part makes it harder. Losing weight was pretty simple for me, but maintaining that low weight was much harder. Someone said that it takes about half a year to form a habit. I maintained lower weight for about a year, then it came back.
The key insight is that your sensation of hunger is primarily driven by the weight of your stomach (not the caloric contents or volumetric fullness of it).
So the question is how do you increase the weight of your stomach (decrease sensation of hunger) without increasing caloric consumption. You just eat a lot of low caloric density foods!
Divide calories by grams on the nutrition label. Lower is better. Replace as many items as you can in your diet with the nearest alternative that is of lower caloric density.
Nonfat greek yogurt and seitan are the two biggest hacks ever. Adopting this mindset will also probably astound you how many calories modern engineering can fit into a gram. Would be a pretty great achievement if we had to trek long distances, but here we are munching on this stuff while sitting all day.
Yeah I instinctively did the same thing once I finally was able to bring myself to counting calories. Once you have a budget, you want to game the budget to feel full, so it makes veggies start looking a lot more attractive, and things like chocolate easier to avoid.
For me one of the big byproducts of this thinking is that my feeling of fullness was mis-calibrated a little bit. As a result, when I’m full according to my calorie counter, I think about how what I’m feeling is not hunger but the correct level of full. I’m recalibrating what full means to me, and believe it or not it actually helps me to not feel like I’m trying to overcome hunger.