Hello Dr Yildiz. Most findings suggest that before widespread agriculture, the homo sapien diet was omnivorous. Our ancestors ate meat, plants, fruits, shrubs, insects, and anything else they could get their hands on. If you eat shrubs, vegetables or fruits, you are eating carbohydrates which the body breaks down into simple glucose. So there were no zero carbohydrate diets.

Obesity has been caused by the ready availability of calories, which has only come about in the last century or so.

I've heard and read the idea the humans thrived on zero carbohydrate diets a few times. It's ridiculous, because homo sapiens have only been around for 200,000 years, and survival was about as much as we managed until the last five thousand years or so.

I think it's sage to assume that there weren't any fat people for most of our history, not because of a lack of carbohydrates (they ate fruits, vegetables and shrubs) but becuase of a lack of calories.

The statement that calories have nothing to do with fat loss is nonsensical.