It really is as "simple" as that. While there are many biological processes that try to maintain homeostasis and weight, if you ingest less calories you will e

It really is as "simple" as that. While there are many biological processes that try to maintain homeostasis and weight, if you ingest less calories you will eventually lose weight. Think of it this way ... if you were thrown in prison today and they gave you only essential nutrients to survive, you'd lose a lot of weight. Your body might go into starvation mode first and try to fight against it, but without any calories coming in, you will lose weight 100% of the time. I decided after years of wanting to lose weight, but doing nothing about it, I would just give up and do 1,000 calorie max / day for 3 months. I lost 20 pounds to bring my BMI in-range without any other changes, and I'm middle aged. That's not the healthiest way to go about this, but it does work.