I don't think it is quite so simple as yay or nay.
Cardio IS good for you, and should be part of any good exercise program.
However, there is some truth underlying the article in that very long cardio sessions can be muscle wasting - as the muscle use up their glycogen reserves, the body goes looking for alternative sources of energy, including cannibalizing muscle to free up protein. As muscle burns calories even at rest, over time this lost muscle can slow your metabolism, and make your longer term weight loss efforts harder.
So, how to square this circle?
* Include strength training in your program as well as just cardio. ST helps maintain your existing muscle mass.
* Unless you are training for a specific endurance event, avoid long duration cardio, and keep your cardio workouts to30-40 minutes. Focus on adding intensity rather than time - basically, aim to run faster, rather than further. The added advantage of this is that working out more intensely gets your heart rate higher and creates additional health and fitness benefits.
* Eat appropriately for your level of activity, and ensure your protein intake is well within the recommended range.
If you love running, don't stop. But there are some tweaks you can make to your program to avoid the worst muscle wasting effects.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
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