50% of your daily food intake should come from complex carbohydrates. That means that a woman who is maintaining an 1800 calories per day food intake will be getting about 900 calories from carbs. Each gram of carbs contains 4 calories. Rather than taking 3 meals per day, you should eat every three waking hours. If you take in 6 meals per day, then, you will be taking in 150 carb calories per meal.