Generally I tell people "the more cardio you do, the better" simply because most people will still never do enough to reach the goals they want to attain. However, it is possible to go overboard and cannibalize muscle tissue with cardio...
Some things to consider... If you are...
1.. Lifting/resistance training regularly
2...Consuming enough calories daily (specifically protein, if gaining/maintaining lean muscle tissue is a goal for you) to maintain your weight...
it is possible, although unlikely, that you are going to hurt yourself with too much cardio.
On the flip side, if you think you are going to lean up and drop weight fast by cutting your calorie intake way down (crash/fad dieting) AND doing massive/intense amounts of cardio, then yes you will send your body into a catabolic state and you will lose lean muscle mass...
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Who Ordered The Whoop Ass Fajitas?!?
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