New study suggests that soy protein relieves arthritis in men

In a new study reported by the Bastyr Center for Natural Health   it appears tgat isoflavones which are naturally orrurring proteins in soybeans, had a significantly positive role in reducing joint pain, stiffness, and inflammation.   

In medical circles, isoflavones are best known for their ability to modulate estrogenic activity in the body by binding to the surfaces of cells in the same places as estrogen (estrogen receptors). Laboratory and animal research have suggested that soy isoflavones can reduce inflammation, improve the condition of cartilage tissue, and reduce pain.

In the reported study, 135 people with known or presumed osteoarthritis of the knee were randomly assigned to receive either a milk protein supplement or a soy protein supplement twice a day for three months. The protein supplements provided 40 grams of protein, 1,400 mg of calcium, and 200 IU of vitamin D per day. The soy supplement provided 88 mg of isoflavones per day while the milk supplement had no isoflavones. Range of motion in both knees was measured and questionnaires to evaluate pain level, ability to function, and use of pain-relieving medications were answered at the beginning of the study and monthly during the study. Blood tests were performed at the beginning and end of the study.

In women, arthritis symptoms were similar in those using the soy protein and those using the milk protein, and there was little reduction in pain and no reduction in medication use with either supplement; in men, however, significant reductions in pain and medication use, as well as improvements in daily functioning, were observed in those who used the soy protein but not in those who used the milk protein.

The study suggests that the soy can come from a variety of sources from soy protein drinks, edamame (baby soybeans) or tofu.  It is the isoflavones that reduce the pain particularly in men.