It is perfectly reasonable to assume that more technically advanced civilizations have existed on this planet in the past. The sheer speed of current advancements is a clue to how thin the strata of evidence would be after it's collapse. In 200 years we've gone from horses to supersonic jets, from abacus to hand-held computers. Were our world to collapse today, most of our technological artifacts would be dissembled and lost in short order. We're just one bead on a long chain of rising and falling cultures. Men and women alike. We are together, doomed together, struggling together, different and the same. No part of our species is any better than another. Sure, one paranoid white guy might fare better in a society that favors white paranoia, and a relaxed black person will find social success in a more laid-back nation. But they are just different, and it's all going to be washed away regardless.
Steak, eggs, potatoes - fruits, nuts, berries and forage. Coconut milk and potent herbs and spices. Tea instead of coffee now and teeny amounts of kelp daily. Let's see how this does! Not really had dairy much, and gut seems better for it.