To me, these extreme diet plans just never made intuitive sense. We survived as omnivores and are constructed to eat a wide variety of foods. Why would you want to cut out completely one of the macronutrients or one of the food groups? In my circle of family and friends, I have my share of health-conscious types that for some reason always like to advertise and post pics of the food they eat. Like they are so proud that they believe is so healthy. It's always some kind of vegetable or fruit salad affair so lovingly and attractively presented. Today it was a concoction of blueberries, pineapple and cantaloupes. The one thing that they all seem to have in common is that they lack protein and the presenters are all fat. When I look at food I automatically look at its macronutrient profile and not so much the actual food itself. So I look at that colorful bowl of fruit as a bowl of fructose.
Of course the same goes for those all, or mostly all, meat/protein diets like carnivore or keto. Anyway, finally, I saw a video that explained this all to me and though it deals with the carnivore diet it can be applied to all.
This Joe Dirt video doesn't explain anything. Looks like it was meant to be funny, but it wasn't.
The keto diet is not a protein diet, and it doesn't cut out completely any of the macronutrients. It has been used successfully since the 1920s by medical professionals and scientists in reversing many health issues. It's sustainable, and it's safe.
Is it extreme? Any lifestyle can be extreme to the person who doesn't follow it.
The standard western diet is very extreme, with very extreme results: Morbid obesity, heart disease, diabetes, fatty liver, cancer, acid reflux, kidney stones, leaky gut, autoimmune disease, mental illness, dementia, etc..
The main culprits are years of daily high blood glucose levels and consumption of "vegetable" oils (Canola oil, soybean oil, corn oil, cottonseed oil, sunflower oil, peanut oil, sesame oil, rice bran oil, etc.)
It's a gold mine for the food and pharmaceutical industries, the same ones who spend fortunes to fool people and make them believe the keto diet is extreme, unsustainable, and dangerous.
As for the carnivore diet, here is a video that actually explains things, with data to back it up: