Blame obesity on mass food production and the cost, in terms of time involved, to make meals:
Sayonara, Mr. Fatty! hinted at many of the same things, too — and these are things I've suspected for a while but found difficult to articulate. We've made it surpassingly easy to overeat, to surround ourselves with calorically-dense but nutritionally-meager food, and to assume that such things can be substitutes for more time-established eating habits. (My mother has a rule about meals: you can eat as much as you like when you're at the table, but forget about snacks unless it's something like crudities.)
Among the other things Vertical sent me recently — and which I didn't review if only because I didn't feel I was competent to speak about them at the time — were a series of cookbooks by celebrity chef Kentaro Kobayashi. He emphasizes ease of preparation, but even an "easy" self-prepared meal is still that much more work than something you pull out of the freezer and stick in the microwave. And probably better for you on all counts.