Calculate keto macro ratios.
The classic ketogenic ratio expresses grams of fat against the combined grams of protein and carbohydrate, because both of those are ketogenic-suppressing in the therapeutic literature. A clinical epilepsy diet runs at 4:1 or 3:1; a well-formulated diet for weight or metabolic goals usually lands between 1.5:1 and 2.5:1, with protein deliberately kept adequate rather than minimised.
Ketogenic ratio
Fat g = calories x fat share / 9; ratio = fat g / (protein g + net carb g)
These figures are population-average estimates for general planning only and are not medical or dietetic advice. Individual energy and nutrient needs vary widely with body composition, activity, medication and health status. Consult a qualified health professional or registered dietitian before making significant changes to what you eat, and especially if you are pregnant or breastfeeding, are under 18, or have a medical condition or a history of disordered eating.
Therapeutic ketogenic diets for epilepsy use 3:1 or 4:1 under medical supervision. For general low-carb or metabolic goals, 1.5:1 to 2:1 is typical and much easier to sustain while keeping protein high enough to preserve muscle.
Fiber is a carbohydrate by analysis but is largely unabsorbed, so it has little effect on blood glucose or ketone production. Most ketogenic protocols therefore subtract fiber and count net carbohydrate.
Generally no. Protein at roughly 1.2-1.6 g per kg body weight protects lean mass, and the widely repeated claim that moderate protein blocks ketosis is not well supported outside therapeutic epilepsy diets.