[anenefan]

I don't think fructose is the one shot answer for carrying more fat than is healthy -- but it's consumption or ratio in food consumed by the general population, IMO plays an important role in higher rates of over weight people in a given population nonetheless [1]. Basic foods grown haven't changed that much, but manufactured foods certainly have changed over the last half a century. So too I guess, have our habits of how we eat changed with devices like microwaves that make frozen one serve portions a practical reality for a fast life.

There will of course be a small percentage of people who carry more fat, for different reasons entirely, not directly related to diet or exercise even.

Interesting experiment you're running. Funny thing, one of those years where I never lost much weight push bike riding and other ideas, I landed a 15kg box of dark chocolate buttons - unintentional but I indulged and started bagging up about 3/4 to a full cup in a bag to take with me for the day's travel ... by end of box I'd lost a bit over a kilo (2 pounds) which seemed odd to me.

[1] https://www.ncbi.nlm.nih.gov/books/NBK576428/#_article-14058...