I am also a registered dietitian. In most states in the US, one must be licensed to provide a “nutrition prescription,” i.e., % of food to be consumed as carbohydrate, protein, and fat, calorie level, vitamins, minerals, water, timing of meals, number of snacks or meals per day, etc. Many factors must be taken into consideration before providing a nutrition plan including age, gender, height, weight, personal goals, medical history including medications, herbals, and supplements, family medical history for risk factor assessment, daily activities, intentional exercise, weight/diet history, menstrual history, sleeping patterns, and more. As Ashley answered, “My Pyramid” is a good place to start. A new model we have is “My Plate,” located at www.choosemyplate.gov. I have been having trouble getting on the site lately — not sure why — may be my computer.