I agree that 2100 calories seems a bit high. As far as how to get more calories in a healthy way, I use sugar-free oatmeal for breakfast with fruit, soup with added vegetables alot for lunch and I eat alot of vegetables-fresh, steamed and roasted. i have recently started roasting eggplant, mushrooms, zucchini, small red potatoes and red peppers and I love them. I don't do it every night, and this would not apply to you, but I do use the Lean Cuisine bag meals sometimes. Everyone says they are bad for you, but I find them convenient and I like them.