Stress can make you do things that are bad for your health—such as eat an entire box of chocolate-dipped doughnuts. Researchers say anxiety creates a whacked-out connection between brain and belly, with the former ordering the latter to consume everything in sight. When you feel the need to eat in times of stress, try this 30-second breathing exercise. Inhale, allowing your belly to rise before your chest. When your lungs feel naturally full, take in even more air. Hold briefly, then exhale. When you feel your lungs are empty, push out even more air to a count of 10 until you have made your lungs as empty as possible. Repeat at least two more times.