You can eat up to 4 chapatis in a day, but you should not eat them in one meal. One medium-size chapati contains around 20 grams of carbs. If you eat 2 chapatis in one meal, you will get approx 40 grams of carbs. Your body can process this amount efficiently. Eating 2 chapatis in one meal will give you the energy your body requires without causing any weight gain.