“If your blood sugar levels are inadequately regulated after eating a high-carb diet, snacks or sugar drink, you can be hit by fatigue after dropping out, mood swings, or even cravings,” says Crouch. “When this happens, it's because the insulin reaction covers the mark and knocks down the sugar a little too much, causing the sweets to cause intense cravings to raise blood sugar levels. This becomes a vicious cycle that reduces insulin sensitivity.”