A diet that lacks essential nutrients, particularly vitamins, is often referred to as a vitamin-deficiency diet. Synonyms for this term include malnutrition, nutritional deficiency, inadequate diet, and lack of essential nutrients. A diet that is low in fruits, vegetables, and other nutrient-dense foods may lead to deficiencies in vitamins such as vitamin C, vitamin D, and vitamin E. These deficiencies can lead to a range of health problems, including weakened immune function, impaired vision, and increased risk of chronic diseases. It's important to maintain a balanced and varied diet to ensure you are getting all the necessary nutrients your body needs to function properly.