I'm wondering, if I got on a low carb diet, with fat/protein one, what will happen when I increase carb intake to normal levels (pre-diet)? Should I do it gradually to make adaptation to it again and not stress my body too much? Are carbs really needed at all? I mean, we lived for a few million years without cultivating rice, wheat etc. (we started growing crops @ ~10.000 BC) and our diet was based on meat, fish, various weeds, berries, fruits, vegetables... Do humans really need carbs to survive and grow? If we take a look @ japanese, they're a healthy bunch of people and their carb use is quite limited (except rice, they eat fish mostly and LOTS of veggies), ofc they are small due to limited usage of protein. So what ya think, do we really need all those oats, wheat, rice etc? Anyone tried bulking/dieting on fat/protein mostly? What's the results, feeling, impressions etc..