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How to gain weight from eating almost exclusively bread and potatoes?
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Peanuts are a good way to slam calories cheaply, though you should make sure you get unsalted or lightly salted. If you continue your current diet but add a half cup of peanuts each day, you'll be adding 3000 calories per week which should be enough to at least stop you from losing more weight if not gain some back slowly. You'll be getting some protein from them too which will help a lot. When I was really underweight, I snacked on peanuts all day in addition to what I was already eating.