Excessive calorie restriction can have detrimental effects on health, including nutrient deficiencies, fatigue, and a weakened immune system. When the body consistently receives fewer calories than needed, it enters a state of starvation, slowing down metabolism to conserve energy. This can lead to muscle loss, hormonal imbalances, and potential heart issues. Additionally, reduced caloric intake can result in psychological effects such as irritability and anxiety. Over time, chronically low calorie consumption can impact overall health significantly, making a balanced approach to caloric intake essential for maintaining well-being and energy levels.