To maintain energy and get the nutrients your body needs to perform critical processes, it’s important to consume a balanced diet high in nutrient-dense foods. Undereating — or eating ultra-processed foods low in essential nutrients — may lead to calorie and nutrient deficiencies, which can cause exhaustion. When you don’t obtain enough calories and nutrients like protein, your body starts breaking down fat and muscle to meet energy demands. This leads to a loss of body fat and muscle mass, which may trigger fatigue. Older adults are especially at risk of malnutrition and nutrient deficiencies due to factors like age-related changes in appetite and reductions in physical activity.
