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I read about it here: http://ca.askmen.com/top_10/fitness/...ness_list.html

Eating too much protein
Why it's dangerous: In the off-season, bodybuilders typically eat 1.25 to 1.5 grams of protein per pound of body weight each day. Before competitions, many increase their protein intake to 1.75 to 2.0 g per pound. However, eating too much protein can have many negative effects. First, it may lead to higher levels of homocysteine, a by-product of protein metabolism and an independent risk factor for heart disease. Moreover, having too much protein in your body can cause irreversible kidney damage and increase your risk of osteoporosis.