One of the biggest culprits of weight gain is not what we eat, but what we drink. Unfortunately, so many of the beverages, even those with healthful looking advertisements, contain high amounts of sugar, causing us to pack on the pounds.
Be mindful of what you're drinking, and try to make it count. Have a V8 or tomato juice instead of a Diet Coke. If you can't live without your favorite fruit juice, dilute it with water to reduce the calories.