The correct answer is:
d. Iodine deficiency
Explanation:
1. Muscle mass: Muscle mass is associated with a faster metabolism because muscles require more energy (calories) to maintain than fat tissue. Therefore, having more muscle mass can contribute to a faster metabolism.
2. Younger age: Generally, younger individuals tend to have faster metabolisms compared to older individuals. This is because metabolism tends to slow down with age due to various factors such as a decrease in muscle mass and changes in hormone levels.
3. Hyperthyroidism: Hyperthyroidism is a condition in which the thyroid gland is overactive and produces an excess of thyroid hormones. This can lead to an increased metabolism, causing weight loss and other symptoms associated with a fast metabolism.
4. Iodine deficiency: Iodine is an essential mineral for the production of thyroid hormones. A lack of iodine in the diet can lead to thyroid dysfunction, including hypothyroidism (underactive thyroid) rather than hyperthyroidism, which is associated with a slower metabolism.
