Iron nutrients are the most difficult to consume in sufficient amounts by healthy pregnant women who eat well-balanced diets.
Nutrients are substances that organisms use to survive, grow and reproduce. Dietary intake requirements for nutrients apply to animals, plants, fungi, and protists. Nutrients are taken up by cells for metabolic purposes or secreted from cells to produce non-cellular structures such as hairs, scales, feathers, and exoskeletons.
Some nutrients such as carbohydrates, lipids, proteins, and fermentation products (ethanol or vinegar) are metabolically converted into smaller molecules in the process of energy release, resulting in water and carbon dioxide as end products. Living things need water.
The essential nutrients for animals are a source of energy and some amino acids that combine to form proteins, a subset of fatty acids, vitamins, and certain minerals. Requires carbon dioxide and oxygen to be absorbed from Fungi living on dead or living organic matter to meet their host's nutritional needs.
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