@DramaticGloveSave your criticism of the all-meat case study are problematic,
1) You're not explaining why it might be working for this one person. It should be explained ideally. One possibility (for example) is that it is a glorified elimination diet. He may have had some undiagnosed allergies in the plant sector, so obviously he's going to be better on all meat-diet. Psychologist Jordan Peterson has said that he's doing a lot better on a diet that's just meat and greens, his auto-immune conditions have gone away.
I suspect that in general, a lot of people have a lot of undiagnosed micro-allergies causing them problems. Since we mix foods these can be hard to identify.
2) You say that one can't get vitamin C from meat. That's incorrect. What's true is that the typical meat that typical consumers eat contains negligible vitamin C, however, someone on all-meat diet is more likely to consume organ meat which can be very rich in vitamin C, as offal as that sounds.
3) You discuss the lack of fibre but that's plausibly a moot point. Fiber is necessary for high-carb diets for two reasons. First, it slows down digestion, within nature fructose is always coupled to fiber which is not the case in processed foods. Scientists have measured that fiber indeed reduces the insulin charge from carb-rich food. Second, your digestive system converts dietary fiber into ... wait for it ... wait for it ... saturated fatty acids. Thus, someone like yourself who is on a plant-based diet is getting a lot of the saturated fatty acids necessary for life since you are eating fiber. However, that's not going to be as critical if you're already getting saturated fatty acids from food.
. Albeit, an hour a day is probably asking too much as i generally don't have that regardless. 45min a few days a week is doable though.
