the original humans in the African savanna or wherever might have been fructivores...but their descendants moved. How much fruit would there be in Norway in winter? In spring? Obviously they had to adapt to what was present for them. Those who could not adapt died. Simple. If you are a Norwegian, you probably won't make a great fructivore..but maybe so...one thing I have read repeatedly is that if you come from coastal stock, eat fish...lots of it..salmon especially if you are northern...they say that brains evolved based on a fish diet and we need those fish oils...think of how little fish we eat and how much depression, ADD etc. there is...also if your ancestors ate a lot of dairy, give it some good thought. If they didn't, then don't. Our ancestors co-evolved with certain food sources. You can bet the bank that we need what they needed. Of course, people are greatly ethnically and biologically mixed so it is more complicated.

mg