They Instead, it promotes more protein or fat in the diet. There are certain versions, according to www.lowcarbbible.com, from a lower carb diet with fewer than 100 grams of carbs daily to a moderate low-carb diet with about 100 to 130 grams of carb intake a day. Some people also eat much fewer carbs, meaning 20 grams a day, but allow some more calories from fat.