Physiological effects of intermittent fasting

Abstract

Intermittent fasting is featured for a period of food deprivation followed by ad libitum feeding, it’s currently being used as a food strategy. The aim of the present study was to analyze the physiological effects of intermittent fasting described in the literature. It’s a narrative review with selected studies using the descriptors "fasting", "caloric restriction", "fasting", "caloric restriction", as well as academic articles and books related to the biochemistry, physiology and history of Ramadan. According to the literature, intermittent fasting promotes important changes in the concentration levels of VLDL, LDL, HDL, total cholesterol and triglycerides. Changes in hematological indicators, blood glucose, insulin and insulin resistance are also reported by some studies. Results may vary according to food consumption, duration of fasting, hydration status, physical activity, sex, seasonal changes, physiological and pathological health of those who adhere to this dietary practice.