In most cases, a carbohydrate refeed is not necessary on a ketogenic diet, as the keto-adapted biological and metabolic changes do not require dietary carbohydrates. There are certain circumstances, however, in which an increase in small carbohydrate influx may be beneficial (i.e. high intensity activity/sports or even during a menstrual cycle for females); however, more research is needed on this topic, specifically with respect to variations of ketogenic diet including “cyclic” and “targeted” ketogenic diets.