How many extra pounds increase your odds of getting a kidney stone? The risk is significantly higher in men who gain about 11 pounds and in women who gain about 25 pounds since around age 20 (compared to those who gain no weight).

The risk also rises if your waist measures at least 37 inches (men or younger women) or at least 31 inches (older women). Risk increases further as you add more pounds or inches.

What to do: Lose excess weight, but not too quickly. Rapid weight loss can increase the risk of kidney stones.

J. Amer. Med. Assoc. 293: 455, 2005.

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