The purpose, as I see it, of carb refeeds is the restoration of leptin levels in the dieter. As we know, caloric restriction reduces leptin levels. With lower leptin comes increased hunger and reduced adherence to a diet. Cravings arise. Energy wanes, immunity suffers. The lack of leptin elicits the cascade of hormones that down regulate metabolism and energy expenditure. Your muscles use less energy and become more efficient – but weaker and less effective. Menstruation and fertility become issues. Dropping calories even more just makes the problem worse. You need to restore leptin, at least for a bit, to right the path. A carb refeed can help you achieve this.

Who needs to refeed? No one “needs” a carb refeed, especially if he or she is feeling good, looking good, and continuing to lose weight with plenty of energy. I never consciously stuff myself with carbs, and I’m doing okay. Remember, too, that a low-carb eating plan doesn’t equal a low calorie eating plan. If your weight loss has stalled, however, and hunger is a constant issue, no matter the depths of your caloric restriction, it may be wise to consider a periodic carbohydrate refeed. If you lack energy throughout the day and your immune system is suffering, you might need to restore your leptin levels with a carb refeed.