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Controlling weight
Obesity increases the chances of developing the disease--particularly in the knees--by putting extra stress on joints that bear much of the body's weight. For every pound gained, 3 pounds of pressure is exerted on the knees and even more pressure is added to the hips. In middle age, weight gain adds to the likelihood of developing OA in the next decade.
Likewise, weight loss reduces that likelihood. In one study, researchers concluded that the incidence of knee OA among elderly men would decrease by 22 percent if those who were obese (with a body mass index equal to or greater than 30) lost enough weight to fall into the overweight category (a BMI between 29.9 and 26) and those in the overweight category lost enough to move into the normal weight category (a BMI less than 26). Similar changes by women would result in a 33 percent decrease in knee OA. A number of studies have indicated that weight loss substantially reduces pain as well.
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