To consume adequate trace minerals without taking a dietary supplement, a person should:

consume a variety of food across the food group.

Explanation:

Trace minerals are the minerals that are required in the body in very small or trace amount. Some of these trace minerals are iron, fluoride, zinc, cobalt, manganese, etc.  

To consume these minerals we have to eat a wide variety of food across all food groups. These trace minerals are important in the body as many of them play a major role in cell metabolism and they regulate our cardiovascular function.  

Doctors prescribe dietary supplement if a person is not able to eat a variety of food to fulfill the need for trace minerals.