Soy, already reported to protect women from bone loss, may be protective in men as well, according to a new report.
Scientists from Oklahoma State University in Stillwater randomly assigned 64 healthy men to take either soy- or milk-based protein supplements for three months. The researchers compared the before and after supplement levels of IGF-I, an insulin like-growth factor found in blood that is associated with increased rates of bone formation.
IGF-I levels increased tremendously: 20% in men using the milk-based supplement and nearly 100% in those using soy protein. In the older men on soy protein, blood levels of IGF-I levels more than doubled. The soy-based protein also depressed an indicator of bone loss.
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