If carbs are keept low(30-50g on rest days, 100-130g on workout days). What would happen if protein is lowered from like 300grams to 200 grams and fat increased to make upp for the kcal? Now the big part of the protein that is lowered will be from semi poor sources(like tuna, chicken(I assume chicken and tuna is of less quality then beef simply because mamals are closer related to humans then fish or fowl))I would still keep the better quality protein from beef, eggs and shakes.
Would it be more probable to lose muscle mass? Would it slow down fat burning and make the diet less effective? Im just wondering because
protein rich food=expensive
Flax and olive oil=cheap