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If you don't get enough protein in your diet, then your body starts using its own sources of protein for energy.
And guess where your body gets the protein from? It starts eating away at your muscles - slowing your metabolic rate, reducing your strength AND bringing muscle growth to a grinding halt. Protein also plays an important part of a fat loss programme. To lose weight you must restrict the number of calories you consume. However, when you cut down on what you eat, the body starts using muscle protein as energy - in other words, you are literally 'eating' yourself. You must get enough protein from your diet to cover these losses. If you fail to get enough protein on a daily basis, you'll quickly lose strength, get weaker and your metabolic rate will slow down.