It's arguably impossible to eat what we would have eaten as cavemen given how essentially every food has been subject to thousands of years of domestication and

It's arguably impossible to eat what we would have eaten as cavemen given how essentially every food has been subject to thousands of years of domestication and cultivation, rendering it relatively distinct from its distant wild ancestor. The gas beans give you is likely due to an inappropriately low amount of gut bacteria required for their digestion. It would be a better idea to try to re-cultivate this bacteria than to exclude beans, however.