My grandmother is trying to gain a little weight -- she is 83, very active and on a no-cholesterol diet due to heart disease in the family. Her doctor suggested drinking an energy drink called Boost but she would rather try to gain weight with regular food. Her normal diet consists of oatmeal, lots of fruit and vegetables, salmon, yogurt, etc. Beyond consuming larger quantities of what she normally eats, do you guys have any suggestions? The best thing I could think of was nuts (10 large walnuts have 300 calories!). She's not really into cooking much anymore, so the easier the better.