The potential health risks of under-eating include nutrient deficiencies, weakened immune function, and loss of muscle mass. Inadequate calorie intake can lead to fatigue, decreased cognitive function, and hormonal imbalances, which can aggravate health issues. Prolonged under-eating may result in anemia, osteoporosis, and an increased risk of chronic diseases. Mental health can also suffer, potentially leading to disordered eating patterns or anxiety about food. It's essential to maintain a balanced diet to support overall well-being and prevent the damaging effects of severe caloric restriction.