Gaining weight requires that you consume more calories each day than you burn. By consuming 250 calories per day more than you burn, you can expect to gain approximately 1/4 lb. per week. Though this may not seem like a great deal, keep in mind that it equates to 13 lbs. gained over the course of one year. By choosing ingredients that are nutritious and calorie-dense, you can use juicing to gain weight.
Incorporate fruits that contain high amounts of natural sugars in your juice. These natural sugars will provide the calories you need to gain weight. Bananas and mangoes are excellent choices, with a medium banana containing 105 calories and a mango containing 202 calories, according to the USDA National Nutrient Database.
Juice vegetables with a high sugar content. Though your options are fairly limited since most vegetables are low in sugar, a few options are available, such a carrots and peas. A medium carrot contains 25 calories and 1 cup of peas contains 117 calories, according to the USDA National Nutrient Database.
Add 1 tbsp. flaxseed oil to your juice. Flaxseed oil contains omega-3 and omega-6 fatty acids and 120 calories per tablespoon. When mixed with your juice, the flavor of the flaxseed oil will be masked by the flavors of the fruits and vegetables.