If our OP has not already seen this, I thought I would post a similar argument as posed at the Ancestral Health Symposium in 2011: "Ancestral nutrition: An alternative approach" by Don Matesz, MA, MS on Vimeo
The presenter went very high in meat and then said he felt lousy. He doesn't posit the lousy feeling on a lack of carbs, a lack of starch or anything that most people would consider the traditional argument for "why high fat diets are bad." He seems to base his arguement on the fact that he was lacking certain key nutrients and he was extremely low in antioxidants. Adding back vegetables in large quantities, eating leafy greens, fruits, flowers, nuts, ect. he says raised his levels of these key compounds in his body which reversed a lot of bad symptoms he was experiencing.
It sounds like he went almost totally vegan for a while but then slowly, added back a (very) minimal amount of animal products. The drastic increase in vegetable and plant matter consumption, he says, allowed him to add these animal products back because within the context of a diet low in antioxidants, animal products cause a lot of damaging oxidative stress, but in the context of a very high antioxidant and nutrient rich diet, animal products can be minimally incorporated for their beneficial amino acid profiles. But without this high level of antioxidants in the diet, animal products do more harm than good.
I hope I am interpreting this right. He uses, as most vegans and vegetarians would, apes as his primary evidence to support his argument. He talks about eating meat because chimps DO eat meat, but of course they eat very little of it and only in times where plant matter is more difficult to come by. This is probably why he decided to reincorporate some small amount of animal foods.