Which of the following is not a nutrient, potassium, fiber iron, vitamin E

Fiber is not a nutrient.

The answer is fiber. Fiber is a type of carbohydrate and while it is important for digestion, it is not classified as a nutrient. Nutrients are substances that provide nourishment and are essential for the body's growth, maintenance, and overall health. Potassium, iron, and vitamin E are all considered essential nutrients.

To determine which of the options is not a nutrient, we need to understand what each option represents.

1. Potassium: Potassium is an essential mineral that plays a vital role in maintaining proper heart and muscle function, fluid balance, and nerve signaling. It is considered a nutrient.

2. Fiber: Fiber is a type of carbohydrate that the body cannot digest. It helps regulate digestion, promotes healthy bowel movements, and supports overall digestive health. Therefore, fiber is also considered a nutrient.

3. Iron: Iron is a mineral that is important for the production of red blood cells and oxygen transport in the body. It is necessary for maintaining energy levels and supporting overall health. Therefore, iron is considered a nutrient.

4. Vitamin E: Vitamin E is a fat-soluble vitamin with antioxidant properties. It helps protect the body's cells from damage caused by free radicals and supports the immune system. Therefore, vitamin E is considered a nutrient.

Based on the information provided, all of the options (potassium, fiber, iron, and vitamin E) are considered nutrients.