Humans have evolved as omnivores. I don’t think it was all steak salads for our ancestors. There were periods of steaks and periods of salads. This is a barbell, living at both ends of a spectrum, but not meddling in the middle.
At one end of the spectrum is the cow, who must eat salad (grass) all day, everyday to get enough calories for survival. Humans should sometimes eat only salads, but eat them constantly like cows do. This includes vegetables with very limited proteins and fats.
The other end of the spectrum is the lion. Lions eat much more infrequently that cows, but they benefit from the boring time cows spend eating salads, by eating the cows. This way they only have to eat one a day or even every few days. When they eat they eat only fats and proteins, no carbs. Because of the infrequency of eating, lions are sometimes starved. There is belief that when starved to a certain point, a lion’s eyesight will actually improve. Helping them hunt.
Throughout civilization, humans have always had religious rituals with periods of starvation and periods of feasting. Maybe this idea is something the ancients knew that has been lost in modernity.
Current research is showing the benefits of fasting, specifically due to the recent interest in intermittent fasting. While IF may not have the longevity increasing principals originally thought. I personally have become much more insulin sensitive during periods of IF and Bulletproof Intermittent Fasting (grass fed butter with coffee in the morning, with the first meal early afternoon.)
This barbell of being vegan sometimes and being carnivore other times is an interesting way to think about nutrition. The idea is from the book Antifragile by Nassim Taleb. I’m experimenting with this to see how it works. I will post updates with further thoughts and experiments.
Lioness hunting worthogs in the western corridor of the SerengetiPhoto cred: Schuyler Shepherd (wikimedia commons)