I'm more Paleo than keto with a little bit of trying to be raw. I think keto is great for losing weight. But I think the body runs on sugar and fat as a reserve. When your body goes thru ketosis it burns for energy stuff that your body should get rid of which is why fasting is great for you but to have that process going for years I don't think is good. Because if you think about it fat is scarce in nature we run best off fructose like what's in fruit as long as we don't overdo it. Fat is meant to be a back up fuel for when there is no food. There are very few fatty plants besides olives and avacados nuts and seeds and animals in the wild have little fat because of it