Bring up muscle to most people concerned with weightloss and they'll immediately say "muscle weighs more than fat." That's true, but the pound of muscle is more compact than a pound of fat, so you'll look better. A few might say "muscle helps burn fat." That's true too. A pound of muscle takes 50 calories a day to maintan. A pound of fat takes less than 5 calories a day to maintain. That means to maintain one pound of muscle for a year, your body needs 18250 calories just to keep that muscle - that's a lot of food. If you didn't have a pound of muscle demanding that food, your body would convert those 18250 calories into 5 pounds of fat! (And remember, your body is always worried about having energy available so it wants to store extra calories!) So if you were going to eat that food anyway, at the end of the year would you rather have that one pound of muscle or the five pounds of fat?
So why does our body convert extra calories into fat instead of muscle? Because our bodies are very efficient. They are always preparing for that time when the food is going to be scarse. Muscle is expensive to keep in caloric terms, 50 calories a day! And it doesn't provide much energy to the body. If the body needs energy, that pound of muscle will only give it 500 calories. On the other hand, fat is cheap storage. It costs very little a day to maintain and it stores a whopping 3500 calories! So your body would much rather store fat than muscle. It's concerned about you starving someday!
What does that mean to you? If you want to build or maintain muscle, you have to use it. Your body will keep around any muscle that it thinks you need. Anything else will be converted into energy to use and if you don't need that energy, it'll store it as fat. So while your body doesn't actually turn muscle into fat, it will get rid of any extra muscle and store any extra energy as fat, so it looks like muscle is being converted into fat. Your body will only keep muscle it thinks you need. Luckily it can't distinguish between chopping wood and lifting weights in the gym. So if you want to lose weight or keep it off, lifting weights will build muscle that will use a lot of those calories you eat to maintain itself.
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Type of tissue
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Calories to maintain for a day
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Calories it’s worth (if used to fuel exercise, for example)
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Muscle
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50
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500
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Fat
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5
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3500
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So you can see that your body would rather keep around extra fat than extra muscle because it's worried about starvation. However, if you want to lose weight, you'll want to keep around more muscle than fat and you'll have to trick the body into thinking you need that muscle by using it everyday. And each pound of muscle you have is five pounds less of fat you'll have at the end of the year!
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