Nutrient
Substance used by organisms to survive, grow, and reproduce.
A nutrient is a substance used by an organism to survive, grow, and reproduce. The requirement for dietary nutrient intake applies to animals, plants, fungi, and protists. Nutrients can be incorporated into cells for metabolic purposes or excreted to create non-cellular structures such as hair, scales, feathers, or exoskeletons. Some nutrients can be metabolically converted into smaller molecules to release energy, leading to end-products of water and carbon dioxide. All organisms require water. Different types of organisms have different essential nutrients, and nutrients may be organic or inorganic.
- classification
- Macronutrients and micronutrients
- macronutrients
- Carbohydrates, fats, proteins, water
- micronutrients
- Vitamins and dietary minerals
- essential for humans
- Nine amino acids, two fatty acids, thirteen vitamins, fourteen minerals, and choline
- inorganic nutrients
- Iron, selenium, zinc
- organic nutrients
- Protein, fats, sugars, vitamins
Lore & Background
Nutrients are classified primarily for animal needs into macronutrients, consumed in large amounts (grams or ounces) to generate energy or incorporate into tissues, and micronutrients, needed in smaller amounts (milligrams or micrograms) for biochemical and physiological roles. Inadequate consumption or absorption issues result in deficiency states that compromise growth, survival, and reproduction. Consumer advisories, such as the United States Dietary Reference Intake, provide guides for lower and upper limits of intake. Regulations in many countries require food labels to display macronutrient and micronutrient content.
Reader's Guide
The concept of nutrients is fundamental to understanding diet and health across all life forms. Essential nutrients cannot be synthesized by the body and must be obtained from dietary sources. For humans, these include nine amino acids, two fatty acids, thirteen vitamins, fourteen minerals, and choline. Macronutrients provide bulk energy and structural components, while micronutrients serve as cofactors and regulators. The distinction between organic and inorganic nutrients helps categorize dietary needs. The study of nutrients guides public health recommendations and food labeling, aiming to prevent deficiency and avoid harm from excessive intake.
Did You Know?
- Ascorbic acid (vitamin C) is essential to humans and some animal species, but most other animals and many plants can synthesize it.
- Only two fatty acids are known to be essential for humans: alpha-linolenic acid (omega-3) and linoleic acid (omega-6).
- The essential nutrient trace elements for humans include potassium, chloride, sodium, calcium, phosphorus, magnesium, iron, zinc, manganese, copper, iodine, chromium, molybdenum, and selenium.
- Vitamins occur in a variety of related forms known as vitamers, which perform the functions of that vitamin and prevent deficiency symptoms.
Frequently Asked Questions
What is a Nutrient in the Nutrition And Diet canon?
A nutrient is any substance an organism needs in order to live, grow, and reproduce. The requirement spans all life forms, including animals, plants, fungi, and protists, and nutrients can either be absorbed into cells for metabolism or used to build external structures like hair, scales, or exoskeletons.
How are nutrients classified in the series?
They split into two broad groups: macronutrients (carbohydrates, fats, proteins, and water) and micronutrients (vitamins and dietary minerals). Within micronutrients, you further get organic ones such as vitamins and inorganic ones like iron, selenium, and zinc.
Which nutrients are listed as essential for humans?
The canon specifies nine amino acids, two fatty acids, thirteen vitamins, fourteen minerals, and choline as the complete set humans cannot synthesize on their own. Every organism, regardless of species, also requires water.
How do nutrients release energy in the story?
Certain nutrients are metabolically broken down into smaller molecules, a process that frees up usable energy for the organism. The end-products of this breakdown are water and carbon dioxide.
Why is the Nutrient entry important to the overall Nutrition And Diet arc?
It establishes the foundational definition that every later episode builds on, covering how organisms acquire, incorporate, or excrete these substances. Understanding the macronutrient/micronutrient split and the organic-versus-inorganic distinction is key to following the rest of the series.
More in Nutrition And Diet 1-22
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