But it doesn’t matter a thing if we cut of nutritious food groups… It only matters if we still get all what we need… 
Fruits are actually sugary water to me with extremely tasty things and some micronutrients I don’t need as I get them from my better food (for vitamin C, fruits bring some while single-handedly raise my needs too… skipping them is fine)… Mmmm, fruits, never will give them up but I don’t consider them particularly healthy for me… Sugar just isn’t great for me. But I can tolerate some.
I can’t imagine what good grains would do.
Legumes are great, if I had to, I would eat them. I don’t have to and it’s good as starches are still pretty useless things though less problematic than quick sugars if you ask my body. But I have complete animal protein. If I was a vegan, I had to combine them with tons of gluten and IDK if that is healthy for me, I never had problems with gluten (I tried some gluten-free years and felt the same) but still. I eat just 100g gluten on most days and maybe it’s not good? No idea, actually…
And for people who get a bit crazy, craving and hungry in presence of carbs… Maybe it’s not super healthy to do it and being slaves of food, moody and obese…
I easily believe some people thrive on much carbs, I am living with such a person, after all.
But I suspect that for very many people it is different. I don’t care what statistics say, I live with my own individual body… But even in general, I believe keto would be better than eating sugars…
And nutrients? If we just consider macronutrients, 2 of them are essential. Why to eat stuff full with the third? When many items low at it are super nutritious? Meat is the only group that has everything we need… Of course meat isn’t necessarily needed at all (it kind of IS for me due to my body preferring very low-carb but I could stay healthy without any meat as I did in the past. I just wouldn’t feel quite as great, only almost and that’s not good enough for me :D). But it can be very, very useful. I don’t like to worry about nutrients. I eat enough meat and this and that and I can chill as it works. Carbs would just mess things up.
Nice point! (But pandas did, by the way. They digest their natural food very poorly I’ve heard. Sometimes stupid things happen evolution wise. Well we need lots of energy since ages so what pandas and koalas and sloths did, that wouldn’t work so well for us. They sacrificed so much to be able to live on too low energy food. We wouldn’t be humans with tiny brains and weak muscles and just eating all day…)
And now I’ve read the article. No wonder people strayed from keto afterwards, I quit keto after 2 months myself and I had several low-carb years under the belt at some point. Many of us need to do things gradually. And many of us feel quite fine on mere low-carb. And there are the siren song of the old carby favs too… IDK how people were selected but it’s different when one is determined and basically need keto for health benefits… I didn’t have that, keto gave me zero benefits over low-carb except fat adaptation. But eventually I found my benefits when I went lower than ever with my carbs…
They gave everyone a certain keto style anyway. Just a carb limit (that allowed a too high carb intake for ketosis, mind you. when I still had an educated and pretty sure guess about my ketosis, I experienced that 50g net carbs is too high. 40g was okay but for many people it’s still way too much. and 40g totally messes with me, I just stay in ketosis and can’t lose any fat and probably wants sweets… <20g is very different especially without much plants if you ask me) and vegs 3 times a day… If that was all, there were quite a huge variety to choose from (even my carnivore-ish could fit - unless I can’t decide what servings is. it’s a stupid word I can’t interpret. one sorrel leaf is a serving to me. okay not that then) BUT not everyone knows right away what they prefer. I needed years to figure it out.
I think too much about it again, right?