The phrase "to prevent nutritional deficiencies" refers to taking measures or actions that are aimed at ensuring an individual's body receives adequate amounts and types of essential nutrients, such as vitamins, minerals, proteins, carbohydrates, fats, etc., through their diet. This is important because nutritional deficiencies can lead to various health problems, including anemia, osteoporosis, muscle weakness, impaired immune function and cognitive decline. Therefore, preventing nutritional deficiencies involves consuming a balanced diet that includes all the essential nutrients in appropriate amounts, as well as monitoring one's intake to ensure they are meeting their daily requirements for optimal health.