Ketosis macros: protein by weight, carbs by level, fat fills the remaining calories
Classic keto: <20–30 g carbs; moderate low-carb — up to 50 g. Protein 1.2–2 g/kg — at least 1 g/kg to preserve muscle. Fat fills up to the calorie target — it is a balancing macro, not mandatory. First 1–2 weeks may bring keto flu — salt, water, electrolytes.