What is the difference between provitamins and preformed vitamins?

• A. Provitamins are already in usable form; preformed vitamins need to be converted into an active form.
• B. Preformed vitamins are already in usable form; provitamins need to be converted into an active form.
• C. Preformed vitamins are only found in supplements; provitamins are only found in natural foods.
• D. Provitamins are only found in supplements; preformed vitamins are only found in natural foods.

Answer: (B)

Verified step by step guidance

1. Understand the definitions of provitamins and preformed vitamins: Provitamins are compounds that the body can convert into active vitamins, while preformed vitamins are already in their active, usable form when consumed.
2. Clarify the process of conversion: Provitamins require enzymatic or metabolic processes in the body to be transformed into their active forms. For example, beta-carotene is a provitamin that the body converts into vitamin A.
3. Identify the sources: Preformed vitamins are typically found in animal-based foods (e.g., retinol in liver or dairy), while provitamins are often found in plant-based foods (e.g., beta-carotene in carrots).
4. Eliminate incorrect statements: Preformed vitamins are not exclusively found in supplements, nor are provitamins only found in natural foods. Both can be present in various dietary sources.
5. Conclude the correct distinction: Preformed vitamins are already in their active form and ready for use by the body, whereas provitamins need to be converted into an active form before they can be utilized.