1. One-Shot Fat Fix
   Want to fight fat? Eat less, exercise more—and get vaccinated. A fat vaccine is in the works at the Scripps Research Institute in La Jolla, California, where tests have led to leaner lab rats. The trick is blocking ghrelin, a hormone that slows down the body’s metabolism. The vaccine triggers the immune system to release antibodies that attack the hormone, enabling you to burn more fat. But don’t pass the holiday ham just yet. Human trials are several years away.

2. Hot ’n’ Heavy

Need to lose some flab?