I read something about the hormone leptin in muscle and fantasy a few years ago. It said that to keep levels of this hormone in the right spot, you should have a high calorie day every so often. The higher your bf, the less often (like 20% was something like every 14 days if i remember correctly). I think around 10% they suggested a person have a high calorie day every 5-7 days or thereabouts. Just something to look into, although muscle and fantasy is generally not a great source of solid info.
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