HUMAN NUTRITION

Detailed explanation-1: -Worldwide, around 65% of adults are affected by lactose malabsorption. Other mammals usually lose the ability to digest lactose after weaning, and this was the ancestral state of all humans before the recent evolution of lactase persistence, which extends lactose tolerance into adulthood.

Detailed explanation-2: -Lactose intolerance is very common in adults. It is rarely dangerous. About 30 million American adults have some degree of lactose intolerance by age 20. In white people, lactose intolerance often develops in children older than age 5.

Detailed explanation-3: -Lactose intolerance is most common in Asian Americans, African Americans, Mexican Americans and Native Americans. Symptoms vary from person to person, but may include: gas, diarrhea, bloating, belly pains and nausea. There is no treatment for lactose intolerance, but symptoms can be managed through diet changes.