Excessive cardio will strip muscle and body fat. This is definitely not the most efficient method to lose body fat. Once you begin stripping muscle tissue, your body becomes less efficient at burning body fat. Muscle is metabolically active, which simply means it stimulates the metabolism.
For each pound of muscle you put on your body, you will burn up to 50 additional calories per day. If you strip muscle tissue, all you accomplish is sabotaging your efforts to efficiently reduce body fat. The PROPER amount of cardio to accomplish your goal is what’s necessary.