No, vitamin C is not fat-soluble.
According to the provided information, the four fat-soluble vitamins are vitamins A, D, E, and K. These vitamins require the presence of dietary fat for easier absorption by the body. In contrast, water-soluble vitamins are not stored in the body. The reference clearly states, "The nine water-soluble vitamins are vitamin C and all the B vitamins."
This distinction is important because it affects how the body absorbs, stores, and excretes the vitamin.
- Fat-Soluble Vitamins (A, D, E, K):
- Absorbed best with dietary fat.
- Can be stored in the body (in the liver and fatty tissues).
- Excess intake can potentially build up to toxic levels.
- Water-Soluble Vitamins (Vitamin C, B vitamins):
- Absorbed easily with water.
- Not stored in the body to a significant extent.
- Excess amounts are typically flushed out in urine.
Therefore, based on the classification provided, vitamin C is firmly categorized as a water-soluble vitamin, not a fat-soluble one.
Understanding the solubility of vitamins helps explain how they function in the body and how they should be consumed. For instance, taking fat-soluble vitamin supplements with a meal containing fat can enhance absorption, while vitamin C doesn't require fat for this purpose.