Meb Keflezighi and Galen Rupp lead the race during the U.S Olympic Marathon Team Trials in February in Los Angeles. Jonathan Moore/Getty Images hide caption

There may be growing chorus of veggie cheerleaders, but don't assume most Americans are choosing salad over hamburgers. iStockphoto hide caption

Whitney Houston sings the National Anthem before Super Bowl XXV — the New York Giants against the Buffalo Bills — at Tampa Stadium on January 27, 1991. The Giants won 20-19. George Rose/Getty Images hide caption

Food Surgery Screenshot Screenshot from The Food Surgeon/YouTube hide caption

Exposure to visual food cues like food ads can influence eating behavior and contribute to weight gain, a study published in the journal Obesity Reviews found. Nick Amoscato/Flickr hide caption

Red Lettuce Ryan Kellman/NPR hide caption

A mock-up of a warning label for sodas and sugary drinks proposed in California by public health advocates in 2015. California Center for Public Health Advocacy hide caption

A dish featuring antibiotic-free beef from Strauss Beef served at Overlake Medical Center in Bellevue, Wash. Courtesy of Overlake Medical Center hide caption

Extra-high amounts of sodium can be hidden in savory snacks like popcorn served at movie theaters and other concession stands. Scott Olson/Getty Images hide caption

Cage-free chickens in a barn near Hershey, Pa., get to roam and perch on steel rods (but they don't go outside). In September, McDonald's said it would buy only cage-free eggs, inspiring several other food companies to follow suit. Dan Charles/NPR hide caption