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it starts to break down muscle
not on its own, you need to lift weights to break down muscle protein rebuilds the muscle once its broken
When working out, you stretch the muscle and break it down. Then by adding protein and amino acids the muscle will repair it self stronger than before.
muscle fibers
No, you need protease to break down meat.
The stomach contains enzymes that break down protein.
protein is important because it builds up muscle cells and is usedto repair them if they get damaged.
Yes, amylase can break down glycogen.
The stomach uses the enzymes to break down foods.
I don't think they are stored. Obviously they are used to make structures such as muscle. If there is a dietary shortage of protein muscle can be broken down to provide amino acids. I have been told that small amounts of muscle tissue may break down in the short period of overnight fasting, and that this has encouraged dieticians to stress the importance of breakfast. I cannot give references for this and frankly consider it should be treated with caution.
Lack of attention (maintenance) causes break downs.
Not really. A lack of calories helps weight loss, but a lack of protein will encourage muscle catabolism- the body will break down muscle for energy- not good when you want to be taking care of fat. Consuming sufficient, or even a little extra protein during caloric reduction, in addition to regular weight lifting, can help to preserve muscle mass while reducing body fat.