Not Enough Food
Skipping meals can lead to food cravings and overeating later in the day — reaching for whatever food is available and making up for the missed calories by eating more. Research at Vanderbilt University found that after approximately 72 hours of not eating consistently, the body shuts down its calorie-burning abilities and begins to store fat, warns Kraus. In clinical studies, after one week, healthy women were seen to lose 16 percent of their resting energy expenditure, which led to increased fat storage and a decrease in metabolism.