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With osteoarthritis, knees become swollen and stiff, and cartilage can degenerate. Ted Kinsman/Science Source hide caption

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Kombucha made by artisan tea brewer Bill Bond in Akron, Ohio, comes in an array of flavors, such as lemongrass, ginger, blueberry and watermelon. Peggy Turbett/The Plain Dealer /Landov hide caption

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Differences in brain chemistry can affect an individual's likelihood of weight gain. Katherine Streeter for NPR hide caption

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Candy-flavored cigars like these in a shop in Albany, N.Y., are the focus of efforts to restrict sales of sweet-flavored tobacco. Hans Pennink/Associated Press hide caption

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Sally O'Neill decided to have a double mastectomy rather than "do a wait-and-see." Richard Knox/NPR hide caption

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Michael Pagliaro, left, laughs with Paul Scattaretico at the Muzic Store Inc. in Dobbs Ferry, N.Y., as Pagliaro picks up instruments for his rental business. Before Pagliaro had a hip replacement, pain made it difficult to work. Maggie Starbard/NPR hide caption

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Depression is common among old people, affecting up to 25 percent. iStockphoto.com hide caption

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Mike Jackson has diabetes and high blood pressure. His eye was damaged after he cut back on insulin because he couldn't afford it. Bryan Terry for NPR hide caption

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Going to the doctor may be uncomfortable for people who are worried about weight. iStockphoto.com hide caption

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Parents can minimize the negative impact of their arguments on their children using a few simple techniques to calm down. iStockphoto.com hide caption

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