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Jupiter said..
You are right about diets and dieting, Vince68. One needs to ask "Why and how did a person gets to be so obese in the first place?" It is because of poor diets and bad lifestyle choices. The trouble is that once they get their weight more or less back on track, they thought everything is honky dory, and revert back to the trash they used to eat. That probably explained why participants in those "Biggest Losers" fake TV shows tend to pile it back on fast.
Another reason I believe is that our stomach has a predetermined volume. It means you can stuff in as much as you like, but no more, because the stomach linings/muscles can sense the stretch/tension created by the food in it. That is why you feel full. However, people who constantly overeat have stretched their stomach over and over again, causing it to enlarge. It means more tucker is needed to trigger the sense of fullness. That is why some obese people needed lap-band treatment as a last resort. It is unnatural, but a sad fact of a society with more than we need, but more of the wrong things !
There have been articles about the hormone that tells us we are full. Apparently skinnier people feel this sensation strongly, but the heavier you get the more damped down you feel it. So, you may not feel full, making the problem worse.
As for stomach size, I have an uncle that had stomach stapling, lost a lot of weight, but the piled it back on again. I can only think that he has adapted to the smaller stomach size and just ate more often. One of his daughters had the same procedure years before and has kept a healthy weight the whole time. In this case I think it comes down to lifestyle and moderating food intake.