> I think America still has the highest level of obesity

Don't worry, most of the world is catching up fast

IMO it's mainly an exposure problem. Excessive exposure to food volume. Excessive exposure to low-fiber foods (fast food = food without fiber). Excessive exposure to fructose. Excessive exposure to pesticides. I personally highly distrust seed and vegetable oils but I don't have any hard evidence to back up my concerns.

All things considered these eventually add up to leptin resistance one way or another. The downstream consequences (obesity, constant hunger, never feeling full, CVD) stem from leptin resistance.

No its not that simple. Many cultures ie all South European ones have very different attitude to food. Savouring and ritual around it, discussion and not fast chop chop and back to treadmill. Quality of ingredients and overall taste experience. Organic whenever possible. Olive oil, cold pressed. Salads. ANd so on and on.

Agreed here. I'm from EU but moved to CA, and the attitude is different. When I visit family in the USA it feels even worse. The quality of food is usually quite bad here. And people eating out fast food just for lunch, or even going to {Fast food chain} in the morning for breakfast just seems crazy to me.

The variety of food is pretty good, I find a lot of different cuisines here. But actual quality food is much harder to find. (Quantity over quality I guess).

You are saying the same thing I did with different words