For the first few months keep a record of everything you eat until you get a good feel for serving size and types of food you need. Write down the amount you ate, the calories, the fat, the protein, and the carbs. I used excel and made a spread sheet that kept a running tally of calories minus what I believed I burned in a day and was able to get a pretty accurate number of pounds lost by knowing 3500 calories equals a pound of fat. This tracking will help you see if you are getting enough protein, if you are eating to many calories, and believe it or not if you are eating to few calories. Eating to few calories will shut your body down and you won't lose anything.