Nutrient/ˈnuːtriənt/ Definition 1 of 2Pro Tip 1/3Vital for Life Nutrients are essential, not optional, for health and growth, much like fuel for a car. Children need a variety of nutrients to develop properly. Pro Tip 2/3Varied Sources Different foods provide different nutrients, so diverse diets are encouraged. Leafy greens are a great source of several key nutrients. Pro Tip 3/3Deficiency Issues Lack of nutrients can lead to health problems, emphasizing their importance. A nutrient deficiency in vitamin C can cause scurvy.