What people believed in the past to be fat, is actually gaining weight

province

In reality, you gain weight only with fat.

Very difficult, just drink oil

There is a hole in the stomach or you vomit, but you do not gain weight.

actually gaining weight

refined carbohydrates

You can eat as much as you eat

Even non-refined products are stewed.

Eating 3 donuts vs. eating 3 bowls of mixed grain rice

Of course the former is easier

Yes

If it tastes good, steam it.

For reference, oil + refined carbon dioxide definitely steams.