Anyone who's tried different weight-loss diets is probably familiar with their pitfalls. Low-calorie diets often leave you tired, hungry, and cranky, often referred to as "hangry." Low-carb or "keto" diets can cause headaches and fatigue, as well as cravings and constipation. Low-fat diets are tough to follow and may not provide much cardiovascular benefit. Another diet trend, intermittent fasting, takes a different approach. Rather than limiting what you eat, this diet limits when you eat. For