You can add additional fat to your diet for extra calories to gain weight, such as, extra margarine on your toast or sandwich or extra oil in your salad. Use polyunsaturated (omega 3, corn oil, nuts, margarine, etc) fats and monounsaturated (olive oil, canola oil, peanut oil, etc) fats, no saturated fats (high fat snack foods, butter, fat spreads) and no trans fats if you are still on a low potassium diet. Hoped this helped you.
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