Прям в чистом виде? Или после переработки лактата печенью в глюкозу?

регулярная физическая нагрузка  - это необходимая часть

и в связи с этим переизбыток белка может привести к снижению или потере кетоза (= замедлению жиросжигания)

Угу. Жрать много белка, чтобы потом избытки утилизировать в процессе физнагрузки, а чтобы избытки утилизировать в процессе физнагрузки - жрать больше белка.

Ну, у тебя вообще все по другому, ты же особенный.   Лично я ем 10-30 гр. углеводов с день и мышам там фиг что достанется, учитывая тем более, физиологическую резистентность. У меня лично мышцы питаются кетоновыми телами.

Совершенно верно! Не люблю и не буду.

Insulin is not Needed for Glucose Uptake and Utilization in Humans
Contrary to popular belief supported by the leading physiology and biochemistry textbooks, there is sufficient population of glucose transporters in all cell membranes at all times to ensure enough glucose uptake to satisfy the cell's respiration, even in the absence of insulin [21]. Insulin can and does increase the number of these transporters in some cells but glucose uptake is never truly insulin dependent. Even under conditions of extreme ketoacidosis there is no significant membrane barrier to glucose uptake – the block occurs "lower down" in the metabolic pathway where the excess of ketones competitively blocks the metabolites of glucose entering the citric acid cycle. Thus, insulin is not needed for glucose uptake and utilization in man [21]. In fact, the process appears to be general for all polar (water-soluble) substrates, as transporters are the mechanism by which they are transported across the highly non-polar (lipid) cell membranes. When insulin is administered to people with diabetes who are fasting, blood glucose concentrations falls. It is generally assumed that this is because insulin increases glucose uptake into tissues. However, this is not the case and is just another metabolic legend arising from in vitro rat data. It has been shown that insulin at concentrations that are within the normal physiological range lowers blood glucose through inhibiting hepatic glucose production [21].

Мышечная работа бывает аэробная, и тогда - да кетоны, цикл Кребса...
И анаэробная. Это только использование глюкозы и гликогена. Увы  . И ахх  .

It has also been claimed that carbohydrate provides the only macronutrient substrate whose stored energy generates ATP non-aerobically. This is not the case, however, since several studies have shown that amino acid catabolism also provides a source of anaerobic energy production [23], Aspartate, for example, can be fermented to succinate or propionate [24]. Interestingly, Ivy et al. [25] and Saunders et al. [26], reported that the addition of protein to a carbohydrate supplement enhanced endurance performance above that which occurred with carbohydrate alone.