Humans have many adaptations to the 'modern' diet, consisting of large quantities of farmed animals products and cereal grains. Lactose tolerance is one of several well-known examples. In some cases these have only come about in the last 200-300 generations. The point is that evolution of large, complex polygenic adaptations may be slow but adaptive phenotypic change can occur very rapidly and it has likely accelerated in humans over the last 10k or so years.
> A human body during 200K years of evolution was not prepared to eating a lot.
We can't go back and ask detailed dieting questions of hunter-gatherer humans 200k years ago, but I'd guess the basic mechanisms of eating were similar to us: they ate when they were hungry and when food was available. For some groups, it seems likely that could often be several times per day.
What we do know about pre-agricultural humans is that there is no such thing as a 'typical' diet, and what was eaten and when could vary significantly by geography. Humans have thrived in every region and ecosystem on earth, and our body is highly adaptable and not designed to subsist on a single, perfect diet or eating cycle.
Pre-modern humans did one thing very differently to what we do today: when they wanted to eat, they had to move and work to get their food. It could very well be that the 'what' and 'when' of our modern eating is less of an issue compared to the high caloric intake and sedentary lifestyle.