Too smart to lose weight?

"Christianity has not been tried and found wanting; it has been found difficult and not tried." -- G.K. Chesterson
Replace "Christianity" with "calorie counting," or any behavior change really, and I think the idea translates.

Considering most of America (by a significant margin) is overweight, I imagine almost everyone wants to consume more than needed to maintain a healthy weight. I personally want to consume more than I need to maintain. Evidently, the majority of us chooses to eat what we want. A minority chooses eating enough to maintain even though it's less than we want. Why? Personally, I'm persuaded by the present reward vs. the future reward explanation. People don't prioritize future reward. Self-discipline works but it takes time and effort to develop, so it's a future reward.

Also agree with comments upthread about online tools changing the game. I, too, had a dog eared calorie counter and notepad. But tracking when making a meal for five people.... with an old analog kitchen scale ... that doesn't register the weight of a tablespoon of oil, gives the same pot different weights each time, only goes to 1 lb, or (horrors) lacks a tare/negative number function? Truly, it WAS easier to have a rules based program with "free" and "forbidden" foods. It was much harder to track accurately. All my bananas were "small."