A customer buys produce at the Euclid Market in the Boyle Heights neighborhood of East Los Angeles in December. The market was reopened in 2013 as part of a project to promote healthy eating among the city's Hispanic population. Courtesy of UCLA Fielding School of Public Health hide caption

itoggle caption Courtesy of UCLA Fielding School of Public Health

Janet Wertheimer does a back hyperextension exercise at Boston Sports Club in Wellesley, Mass. Regular exercise has helped control her chronic back pain. Ellen Webber for NPR hide caption

itoggle caption Ellen Webber for NPR

Solid friendships can help buffer life's stress. iStockphoto hide caption

itoggle caption iStockphoto

Colleen Frainey, 16, of Tualatin, Ore., cut back on advanced placement classes in her junior year because the stress was making her physically ill. Toni Greaves for NPR hide caption

itoggle caption Toni Greaves for NPR

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

itoggle caption Ted Kinsman/Science Source

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

itoggle caption Peggy Turbett/The Plain Dealer /Landov

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

itoggle caption Katherine Streeter for NPR

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

itoggle caption Hans Pennink/Associated Press

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

itoggle caption Richard Knox/NPR

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

itoggle caption Maggie Starbard/NPR