Many people are adopting intermittent fasting as an eating pattern because of its benefit to their health. However, many people also fail to recognize that intermittent fasting can have negative impacts on them. Intermittent fasting is associated with headache, fatigue, irritability, nausea, dizziness, hair loss, constipation, change in the menstrual cycle, mood changes, dehydration, persistent hunger, bloating, heartburn, increase cravings, change in body temperature, poor work performance and so on. Pregnant women and children are advised to avoid intermittent fasting, as this can cause them to become hypoglycemic. People with certain chronic diseases and eating disorders are also not advised to try intermittent fasting. If you have any medical condition or part of any of the categories of people discussed above, visit your doctor before you begin an intermitting fasting eating plan.