By monitoring how many calories, fat or carbohydrates you take in each day you can begin to decrease these amounts and lose weight. By recording what you eat it helps you decide what food groups you are missing. Many people don't eat the recommended fruits and vegetables to meet a healthy diet. Writing down the foods you eat helps you see what you are missing and meet those requirements.Creating a record of your daily food intake and exercise program can be very beneficial to your physician if he prescribes a special diet for you.Many people can suffer with medical problems based on their diet. By recording what you eat helps you discover problem foods and what you should avoid. Recording your food intake makes you realize just how much food you are eating each day.