HUMAN NUTRITION

Detailed explanation-1: -The most common food fortified with vitamin D is fresh milk, contributing 44% of the total daily vitamin D intake.

Detailed explanation-2: -If milk and dairy products are not fortified, they are normally low in vitamin D, with the exception of butter because of its high fat content.

Detailed explanation-3: -In the 1930s, the United States began to fortify milk with vitamin D in an effort to eradicate rickets. The disease-caused by vitamin D deficiency that softens and weakens the bones-was rampant at the time among poor children, particularly in northern U.S. cities.