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A series, by Ellen Abbott, on the issue of concussions in CNY.

This week: preventing kidney stones, the mysteries of sarcoidosis and more

With the incidence of kidney stones on the rise, experts believe the obesity epidemic is at least partially to blame. But there are some preventative measures that could save you from some pain.

The key is to drink adequate amounts of water or other non-alcoholic beverages, says Dr. Stephen Knohl, a professor of medicine at Upstate University Hospital who specializes in nephrology. He says for someone who has previously suffered from kidney stones, the goal should be to drink eight ounces of water each waking hour. Including a squeeze of lemon is even better, because the citrate in the lemon is thought to help prevent stone formation and growth.

Also this week: we address sarcoidosis, a chronic disease that can affect multiple body organs. Plus, the symptoms, myths and recommendations for sports-related concussions.