We have no idea what hunter-gatherer diets were like except for those that have been observed by literate people and recorded. 10% of the traditional diet of the San people in Botswana is bugs, and basically all they do is look for something to eat. Given the opportunity to walk into a supermarket and fill a basket with foods that they like in 10 minutes, no one would live that way. Even off-grid people occaisionally visit Costco.