So i went hardcore paleo for about 2 months, while juicing with a NutriNinja extractor twice a day. I also only ate chicken or fish meat every other day. For breakfast i would rotate every other day between either an egg breakfast or a breakfast of something i baked with coconut flour such as pancakes. For lunch everyday still, i eat a good size salad with a handful of nuts and my homemade ranch dressing. Then for supper i will maybe have chicken or fish with a crap load of sauteed veggies such as broccoli, carrots, onions, tomatoes, sweet potatoes, or like zucchini and chicken spaghetti. My acne started to instantly clear up, i still got some tiny and random breakouts here and there for unknown reasons, and still have a very black-headed nose, but i havent had one extremely deep and painful pimple like i use to always get. And it wasnt just my face that cleared, my back, chest, and buttocks all cleared. Then i started to run into some problems, such as very easy lightheaded from getting up to a higher position from a lower position, always cold when others were warm along with a runny nose sometimes. I figured it had to be a lack of either carbs, protein, calories, or iron or something. So ive been doing research and recording my daily intakes of nutrients, and sure enough i was lacking carbs, iron, and calories. So i decided to start re-introducing some grains, only gluten/wheat free whole grains, such as oats and brown rice. I eat one type every two days and wait to see if i breakout. So far oats and brown rice did not break me out, and i am going to try others and some yogurt. I wanted to know though, is it possible to build a tolerance to foods after not eating them for a long time? Cause i feel like that is my case.