ISLAMABAD: A new study suggests that people with a genetic intolerance to lactose should increase their intake of non-dairy foods rich in vitamin D, after finding that they are more likely to have low levels of the essential nutrient.
Study co-author Ahmed El-Sohemy, a professor of nutrition at the University of Toronto’s Faculty of Medicine in Canada, and colleagues recently reported their findings in the Journal of Nutrition.
Lactose intolerance is defined as the body’s inability to effectively digest lactose, a sugar found in dairy products, including milk, butter, and cheese.
The condition occurs when the small intestine fails to produce sufficient amounts of lactase, which is the enzyme that breaks down lactose. If a person with lactose intolerance consumes dairy products, they may experience bloating, flatulence, diarrhea, nausea, and abdominal pain. These symptoms usually arise around 30 minutes to 2 hours after lactose consumption. The Health Study by El-Sohemy and colleagues found that people who possessed LCT gene mutations had a lower intake of dairy products, compared with the general population.
Individuals with LCT gene mutations also had lower blood levels of vitamin D, which the team says is likely down to reduced intake of dairy products, since these are often fortified with vitamin D.
“We were not surprised that lactose intolerant people ate less dairy,” says El-Sohemy, “but we were surprised that they did not compensate by supplementing or eating other foods fortified with this crucial nutrient.”
Vitamin D is considered essential for the absorption of calcium in the gut, which is important for good bone health. The vitamin also aids nerve functioning and helps the body to stave off bacteria and viruses. Interestingly, the researchers found that people with LCT gene mutations were shorter than individuals in the general population, which indicates that reduced intake of vitamin D through lack of dairy consumption may be inhibiting bone growth. El-Sohemy and colleagues say that their findings suggest that people with lactose intolerance should consider increasing their intake of vitamin D through non-dairy food sources.
“These findings speak to the need for greater awareness for those who limit dairy because of lactose intolerance. They need to be mindful of getting enough vitamin D from other fortified foods like certain brands of orange juice, or to consider trying lactose-free dairy products.”