Blowing off breakfast
It really is the most important meal of the day, says Boston-based nutritionist Dana Greene, RD. “Breakfast regulates your appetite for the whole day so skipping it makes you eat more later in the day—setting you up for weight gain. And you know that being overweight or obese increases risk for heart disease and death.” (Make sure you know the 8 seemingly harmless habits that can cause osteoporosis.)