I've read sooo many things on this and I was also, long ago, a believer in cardio on an empty stomach. Then I read an article about how doing cardio on an empty stomach will raise cortisol levels and causes catabolic effects on muscle. After reading that I've never purposely done cardio on an completely empty stomach. Reason I say purposely is because every once an awhile I'll for get and half way through the cardio it'll hit me.
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