Working out with a full stomach vs. empty stomach?!


Question: Working out with a full stomach vs. empty stomach?
I heard that if you work out (cardio, interval training and weight lifting) on an empty stomach you'll burn more fat than if you work out when you've eaten. But I also heard that the a drawback of this method is that muscle will also burn away. My question is, is this true?

BONUS QUESTION: Will weight lifting stunt my growth? (I'm only 14 and about 5'6, 5'7)

Answers:

Your body needs to make ATP through aerobic respiration to contract muscles during exercise and maintain body temp, it does many other things too but they're less important to this answer. For aerobic respiration to occur your cells need glucose, and this comes from the food you have eaten (especially carbohydrates) being broken down by enzymes in the stomach and small intestine. If there is no food but the body needs to respire the body will start to eat itself, breaking down first fat (which exists mostly for this reason) and then as a last resort muscle. However, unless you properly starve yourself for 2 days and are very thin it's very unlikely that an average workout will start tapping into your muscles for glucose, it will just burn fat. The only time muscles might be broken down is during something like a marathon, and runners call this point 'the wall'.

No weight training will not stunt your growth but it might damage your joins because they are still growing.



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1) its better on a semi full stomach. not full and not hungry either. so that you dont get cramps, or burn away muscle.
2) if the weights are heavy enough, they will. just dont lift things that seem impossible to lift, like 50-100 lb. weights.

experience, well atleast with number one. hhaha



The best thing to do is work out on an empty stomach, and eat after. When you eat right after exercising, your body immediately uses all the protein to go to your muscles.

Weight lifting does not stunt your growth, it is an old wives' tale.



well i was told to never work out when you're hungry...so if it's been a while since you've eaten and you're going to exercise have something to eat first, even if its a small glass of a smoothie, or a nutri-grain bar or something.




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