Essential nutrients
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Essential Nutrients: Definition and Types
Essential nutrients are substances that the human body cannot produce on its own and must be obtained through the diet to maintain health, support growth, and prevent disease 14. These nutrients are divided into two main categories: macronutrients (such as proteins, fats, and carbohydrates) and micronutrients (including vitamins and minerals) 14. Micronutrients are typically required in much smaller amounts than macronutrients, often less than 100 milligrams per day .
Key Essential Nutrients for Human Health
Vitamins and Minerals
Vitamins and minerals are critical for various bodily functions, including tissue maintenance, enzyme function, and disease prevention 17. Major minerals required in larger amounts include phosphorus, calcium, sodium, potassium, and magnesium, while trace elements such as iron, zinc, copper, iodine, selenium, and manganese are needed in smaller quantities but are equally vital 18. Deficiencies in these nutrients can lead to a range of health problems, from impaired growth and development to increased risk of chronic diseases 478.
Essential Fatty Acids and Amino Acids
Essential fatty acids (like linoleic acid) and essential amino acids must also be obtained from the diet, as the body cannot synthesize them . These nutrients play roles in cell structure, hormone production, and overall metabolic health .
Conditionally Essential Nutrients
Some nutrients, such as l-arginine, l-carnitine, and coenzyme Q10, are considered conditionally essential. Under normal conditions, the body can produce enough of these, but during illness or stress (such as cardiovascular disease), dietary intake may become necessary to meet increased needs .
Ultratrace Elements
Elements like arsenic, nickel, and silicon are required in extremely small amounts and are considered ultratrace essential nutrients. There is also emerging evidence for the essentiality of boron, lithium, and vanadium, though more research is needed .
Sources and Deficiency Risks
Essential nutrients are primarily obtained from a varied diet that includes whole grains, fruits, vegetables, dairy, and meats . Plant foods are especially important sources of many vitamins and minerals 810. However, deficiencies can still occur, particularly in populations with limited food variety or increased physiological needs, such as the elderly 78. Over two billion people worldwide are affected by micronutrient deficiencies, which can lead to increased susceptibility to infections and chronic diseases 17.
Essential Nutrients and Disease Prevention
Adequate intake of essential nutrients is linked to reduced risk of chronic diseases, including cardiovascular disease, musculoskeletal disorders, and neurodegenerative conditions 1257. For example, higher levels of vitamin D and vitamin E have been shown to be protective against certain diseases like amyotrophic lateral sclerosis (ALS), while deficiencies in these and other nutrients can increase disease risk 27. In aging populations, ensuring sufficient intake of vitamins and minerals is particularly important for maintaining health and reducing the progression of noncommunicable diseases .
Essential Nutrients in Plants
Plants also require essential nutrients for growth and development, including nitrogen, phosphorus, potassium, calcium, and magnesium, as well as trace elements like iron and zinc 3910. These nutrients are absorbed from the soil and are critical for plant health, which in turn affects the nutritional quality of plant-based foods consumed by humans 3910.
Conclusion
Essential nutrients are fundamental for human and plant health, supporting growth, development, and disease prevention. A balanced diet rich in a variety of foods is the best way to ensure adequate intake of all essential nutrients. Ongoing research continues to refine our understanding of these nutrients and their roles in health and disease, highlighting the importance of nutrition in public health strategies worldwide 147.
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