Kinda remind me of the Anabolic Diet by Mauro Di Pascale.
He states in his book that this diet is the best for Natural Bodybuilder, where a High Carb, low fat diet is a disaster for Natural bodybuilder.
He said That high carb intake is only good if your on Gear.
Guys in the 1960-1970 were using this type of diet macronutrients, High Protein,High fat, low carb.
Kinda make sense since Fat are like natural steroids where carb is empty.
I know natural bodybuilders that compete on High fat, High Protein, low carb diet againts gear using bodybuilders and their hold their own
Seem like its the best possible way to eat for Having lean body composition while retaining muscle mass.
In precontest you usually have 2 type of diet, High fat, Protein low carb.
Or
High Carb, Protein, low fat.
Keep in mind that Omega 3 and Omega 6 fatty acids are Essential nutrients, most be in the diet at all time, so it kinda make sense that the High Fat diet, like palumbo for example is healthier than low fat diet since when you eat High Fat Protein(Meat,Eggs,fish salmon) They contain Omega 3, Omega 6 Fats.