If you reach for something sweet when you're stressed or angry - or simply out of habit - then you're definitely not alone. Many people reach for simple carbohydrates like candy, ice cream or cookies when they're tired or upset. Some researchers are convinced that carb cravings like this may indicate depression because they're linked to a drop in serotonin - the feel-good hormone, and is marked by a decline in mood and concentration. If you'll go to great lengths to satisfy your carb craving - like leaving work to visit the bakery down the street in the middle of the afternoon, or looking for the same food several times a week - it might indicate a tendency to be depressed. It pays to look at your carb-satisfying habits.