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Have there ever been any academic studies on how slowly increasing calories vs quickly increasing calories effects muscle gain and body fat for people who weight train / body build? By slowly increasing calories, I mean around 25 to 50 calories every 2 weeks.

Assuming that slowly increasing calories is an effective method of putting on lean mass, where should the extra calories be coming from (protein, or fats, or carbs) and how long will it take to put on 1 lbs of weight? Should cardio be limited if you're increasing calories this slowly?

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