Step-by-step explanation:
One nutrient that has the greatest potential for excess dosage due to a combination of taking supplements and eating fortified foods is vitamin A.
Vitamin A is a fat-soluble vitamin that is important for vision, immune function, and cellular growth and differentiation. However, excessive intake of vitamin A can lead to toxicity, which can cause symptoms such as nausea, vomiting, dizziness, and blurred vision. In severe cases, it can lead to liver damage, bone abnormalities, and even death.
Many foods are fortified with vitamin A, such as milk, cereal, and bread. In addition, vitamin A supplements are widely available and commonly used. When combined, it is possible to exceed the recommended daily intake of vitamin A, which is 900 micrograms (mcg) per day for adult men and 700 mcg per day for adult women.
It is important to note that vitamin A toxicity is not typically caused by consuming too many foods that naturally contain vitamin A, such as carrots or sweet potatoes. Rather, it is more commonly caused by consuming excessive amounts of vitamin A through supplements or fortified foods. Therefore, it is important to be mindful of the amount of vitamin A you are consuming from all sources, including supplements and fortified foods, and to not exceed the recommended daily intake unless under the guidance of a healthcare professional.