A 1600-calorie diet will include all of the food groups in the correct proportions. Figure out how much of each food group you’ll need with theuseful tips provided by a licensed dietitian in this free video on a 1600-calorie diet plan. Expert: Charlotte Lawson Bio: Charlotte Lawson is a licensed and registered dietitian and nutritionist who graduated from Michigan State University with a Bachelor of Science in dietetics and health promotion specialization. Filmmaker: Christopher Rokosz Series Description: The best way to stay on a diet is to not think of it as a restrictive thing. Choose the right elements for your diet with the useful tips provided by a licensed dietitian in this free video series on healthy eating diet tips.