It’s because the human physique both doesn’t produce sufficient of them, or it doesn’t produce any in any respect.
Every organism has completely different vitamin necessities. For instance, people have to eat vitamin C, or vitamin C, however canines don’t. Canine can produce, or synthesize, sufficient vitamin C for their very own wants, however people can’t.
Folks have to get most of their vitamin D from publicity to daylight, as a result of it isn’t out there in massive sufficient portions in meals. Nevertheless, the human physique can synthesize it when uncovered to daylight.
Completely different nutritional vitamins have completely different roles, and they’re wanted in several portions.
This text explains what nutritional vitamins are, what they do, and which meals present every kind. Observe the hyperlinks for extra details about every kind of vitamin.
Quick info on nutritional vitamins
Listed below are some key factors about nutritional vitamins. Extra element and supporting data is in the principle article.
- There are 13 recognized nutritional vitamins.
- Nutritional vitamins are both water-soluble or fat-soluble.
- Fats-soluble nutritional vitamins are simpler for the physique to retailer than water-soluble.
- Nutritional vitamins at all times comprise carbon, so they’re described as “natural.”
- Meals is the most effective supply of nutritional vitamins, however some individuals could also be suggested by a doctor to make use of dietary supplements.
What are nutritional vitamins?
Fruit and veggies are good sources of a variety of nutritional vitamins.
A vitamin is one among a gaggle of natural substances that’s current in minute quantities in pure foodstuffs. Nutritional vitamins are important to regular metabolism. If we don’t take sufficient of any sort of vitamin, sure medical circumstances may end up.
A vitamin is each:
- an natural compound, which implies it comprises carbon
- a necessary nutrient that physique can’t produce sufficient of and which it must get from meals
There are at the moment 13 acknowledged nutritional vitamins.
Fats-soluble and water-soluble nutritional vitamins
Nutritional vitamins are both fat-soluble or water-soluble.
Fats-soluble nutritional vitamins
Fats-soluble nutritional vitamins are saved within the fatty tissues of the physique and the liver. Nutritional vitamins A, D, E, and Okay are fat-soluble. These are simpler to retailer than water-soluble nutritional vitamins, and so they can keep within the physique as reserves for days, and typically months.
Fats-soluble nutritional vitamins are absorbed via the intestinal tract with the assistance of fat, or lipids.
Water-soluble nutritional vitamins
Water-soluble nutritional vitamins don’t remain within the physique for lengthy. The physique can’t retailer them, and they’re quickly excreted in urine. Due to this, water-soluble nutritional vitamins have to be changed extra usually than fat-soluble ones.
Vitamin C and all of the B nutritional vitamins are water soluble.