I've messed around with a carnivore diet. Mostly I'm on a slighty modified version of Paleo, but I tend to go back and forth messing with more extreme diets.
So when you get, generally, less than 50 grams of carbs a day, you are going to enter into a metoblic state known as ketosis. To simplify what this means; your body is going to use fat instead of carbs as it's energy source. When you first enter this state, you are going to be very tired and lack any kind of energy. Your breath and urine are going to smell kinda strange. After a few days though, you will get your energy levels back, as your body will get used to using fat as its energy source.
Now, most healthy people can totally live off just meat. There have been studies of this and the people were fine. In fact, in some health tests, they scored better than others who had a more normal diet with fruits and vegetables. It will, over time, have some negative affects on your liver, as digesting massive amounts of protien will do this.
The question though is will an all meat diet be healthier than meat, vegetables and some fruit? I dunno. My experience was that I had great energy levels, but I lost tremendous amounts of body fat....like, too much. I'm already always lean from eating Paleo all the time, but I reach a good body fat ratio. On the carnivore diet, i couldn't stop losing weight.
Now, I totally support you doing this. It's fun to figure out which diets have the best result. But two things; firstly, only eat GOOD meat. If you are eating shitty hamburgers and meat from some shitty grocery store, than it WILL be bad for you. Only eat grass-fed and finished beef and fish. Good stuff, man. Second, I saw you refer to lions and tigers eating only meat....we aren't lions and tigers. Don't base any of your "we should do this cause they do" ideas off of other animals. They have totally different digestive systems and evolved to eat totally different things.
Overall, I found eating like 80% meat and then the rest of my diet being vegetables was the best, for me. I have great energy. Can build muscle when working out. Can keep some weight on. This ratio allows me to stay in ketosis (as I don't eat enough carbs via vegetables to get over 50 grams) and still get the vitamins and nutrients from veggies, which are important.
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