Final answer:
The majority of magnesium in the body comes from the diet, specifically from sources such as milk, eggs, cabbage, and cauliflower.
Step-by-step explanation:
The majority of magnesium that is inside your body comes from your diet, specifically from sources such as milk, eggs, cabbage, and cauliflower. Magnesium is present in these foods and is absorbed by the body. The daily requirement of magnesium varies depending on age, with infants needing 100-150 mg, children needing 150-200 mg, and adults needing 200-300 mg.