The four carbohydrate approaches
Standard dietary guidelines recommend 45–55% of calories from carbohydrates, which is appropriate for most active adults. Low-carb protocols reduce this to 25–35%, producing modest metabolic changes and increased fat oxidation. Very-low-carb (ketogenic) diets restrict carbohydrates to below 10% of calories—typically under 50 g/day—to induce nutritional ketosis.
High-carb approaches (60–70%) are used by endurance athletes and those with high training volumes, where glycogen replenishment is a priority. The correct approach depends on individual health, training demands, and metabolic response rather than any single universal rule.