If I understand the 811 "diet" (as of its Latin definition of diet=lifestyle) it relies on the fact that the human body is extremely good at storing fat from foods but not very efficient at storing carbohydrates.
As such, I suspect that storing 1 calorie from fat (lipid) probably "costs" no more than 1 calorie (most likely in sugar) while breaking down 1 carbohydrate probably costs more than one calorie. This would explain homeostasis and why people on 811 look "better" than people on SAD. As such, this would also explain why overeating on 811 lvrf is simply not possible (assuming non-consumption of processed foods, like bread for instance which is 811 but not lvrf); same thing with fruits and fruitarians, whom, if this above statement is correct can not overeat.
Now if I may ask, do we have any document or study on how many calories are required to process and store fat vs. carbohydrates? I understand that this might be different based on the individuals' dna, but even a rough estimate would be useful.