Answer:
Step-by-step explanation:
One example of a nutrient that has been deemed essential but has not been classified as a vitamin is choline. Choline is a water-soluble nutrient that is important for several physiological functions in the body, including the formation and maintenance of cell membranes, the metabolism of fats, and the production of the neurotransmitter acetylcholine. While choline is not considered a vitamin, it is still essential for human health and must be obtained from the diet or through supplementation. Good dietary sources of choline include egg yolks, liver, and soybeans.