ISSA Nutritionist Practice Exam

Why is magnesium considered an important nutrient in diets?

1. It is not commonly found in food.

2. It supports muscle and nerve function.

3. It provides a significant source of calories.

4. It solely aids in bone health.

The correct answer is: It supports muscle and nerve function.

Magnesium is considered an essential nutrient in diets primarily because it plays a crucial role in supporting muscle and nerve function. This mineral is involved in over 300 biochemical reactions in the body, including those that regulate muscle contractions and nerve impulses. Without adequate magnesium, muscles may cramp or spasm, and nerve function can become impaired, leading to issues such as tingling or numbness. In addition to its role in muscle and nerve function, magnesium is also important for energy production, protein synthesis, and maintaining normal blood pressure. It contributes to the structural development of bones, but it is not solely responsible for bone health. Other nutrients such as calcium and vitamin D are also vital in this regard, clarifying that magnesium's role extends beyond just bone support. Regarding the other aspects of magnesium, while it is indeed found in a variety of foods including leafy greens, nuts, seeds, and whole grains, it is not accurate to say it is not commonly found in food. Additionally, magnesium does not provide a significant source of calories, as it is a mineral and does not contain energy like macronutrients do. Thus, its key role in muscle and nerve function underscores its importance in a balanced diet.