Examine.com is a great resource.<p>I coach myself and other bodybuilders&#x2F;figure athletes on the side, consider this anecdotal. Working with the extremes of muscle mass I&#x27;ve found that it can affect metabolism a great deal. Simply by the fact that you have so much more weight to carry around&#x2F;maintain. For example, I maintain weight at 205lb @ 5&#x27;7&quot; (relatively) lean at 3500 kcal, for a competition I have to be ~170lb, my maintenance intake at that weight is closer to 2000kcal. Note that exercise also increases closer to a competition, so that 2000kcal maintenance is with higher activity levels than offseason.