Nutritional insufficiency occurs when an individual does not consume enough essential nutrients, such as vitamins, minerals, proteins, fats, and carbohydrates, to maintain optimal health. This can result from poor dietary choices, limited access to food, or specific health conditions that affect nutrient absorption. Common signs of nutritional insufficiency include fatigue, weakened immunity, and poor growth in children. Addressing this issue often involves improving dietary habits, increasing food variety, and, in some cases, using supplements to ensure adequate intake of necessary nutrients like vitamin D or iron.