So how many extra calories do you need to gain weight fast? First, understand that everyone is different and things may be different for you. The basic idea is that to gain a Rapid Fast Keto Boost pound you need to add 7700 calories to your diet. So that is about 500 calories a day in a week. Let's say you are consuming exactly what you spend. That means you only need to add two cups of milk and two tablespoons of peanut butter to your diet every day and you get about half a pound a week!

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