So many people start out here and then disappear after a few weeks. Many, many! We don't know what happens to them. Maybe they gave up on trying to lose weight after a short time, but we can't say for sure.
We don't track the highly successful ones who stop posting, but I do know a couple of them.
Of course, what I said was "TEND to." We do have successful people who have stuck around, and many who are trying again and again. But as you said, bonnnie, eventually other things in our life besides weight loss get our attention again.
In my mind there's a difference between saying humans are unable to control natural processes (which wasn't my phrase anyway), and implying that the goal of learning about a natural process would be to control it.
I didn't have to learn everything there was to know about alcoholism to decide not to drink anymore.

All I had to do was observe that if it looks like a duck, and quacks like a duck, and swims like a duck....
Gosh, no food is on my "nothing" list. (Well, except for clams, oysters, and scallops, because I'm violently allergic to them! And also to soy protein, though it's not so severe. But that's a different matter.) So it's not that my partner brings "personally forbidden" food into the house, it's that at times I am unable to restrain myself with portions of certain foods.
Portion control is often successful for me. (Lately, not so much.

) One of my strategies involves pre-portioning out foods, so that a container has a single unit serving in it. That way I tend to avoid going over the portion I want to eat. When the container is empty, I'm done. Lately... well... I go beyond one container... and then the strategy can backfire, because it's too tempting to eat the entire second container with some sort of "round number" notion.
Some foods just don't come into my house, with my partner's agreement. One of these is ice cream. We just go out for it if we want it, rather than having it sitting there in the freezer. It sings a siren song to me, but not to my partner.
I like what you said, Jessica (paperclippy), about social conditioning. If you watch TV, there is at least one pizza ad every half hour. They always show happy, THIN people eating huge slabs of pizza dripping with cheese. And that's just the pizza ads--not to mention the fast food burgers, chicken, whipped ice cream drinks, upscale restaurant chains where a single plate of food may contain 1200 calories, and so on.
Also, snack time is definitely problematic for me, and I don't even work in an office with lots of coworkers bringing things in.
Jay