Sep 26, 2024 · At Diet Doctor, we define keto and low carb diets by the following: Keto: Less than 20 grams of net carbs per day. Moderate low carb: Between 20 and 50 grams of net carbs per day. Liberal low carb: Between 50 and 100 grams of net carbs per day. On a keto diet, carbohydrates are minimized to achieve ketosis.