ISSA Nutritionist Practice Exam

Which of the following is a water-soluble vitamin?

1. Vitamin A

2. Vitamin D

3. Vitamin E

4. Vitamin C

The correct answer is: Vitamin C

Vitamin C is categorized as a water-soluble vitamin, meaning it dissolves in water and is not stored in the body in significant amounts. Unlike fat-soluble vitamins, which can be stored in the liver and fatty tissues, water-soluble vitamins are excreted through urine, which means they need to be consumed more regularly in the diet to maintain adequate levels. Vitamin C plays a critical role in several bodily functions, including the synthesis of collagen, absorption of iron, and functioning as an antioxidant. It is vital for the immune system and for wound healing, making it an important nutrient for overall health. In contrast, Vitamin A, Vitamin D, and Vitamin E are fat-soluble vitamins. These vitamins require dietary fat for absorption and are stored in body tissues. Fat-soluble vitamins can lead to toxicity if consumed in excessive amounts because they build up over time in the body. Understanding these differences between water-soluble and fat-soluble vitamins is crucial for proper nutrition and dietary planning.