07 February 2014

Fortified foods don't make enough of a difference

Fortification of foods with additional nutrients does have an impact on kids' intake of vitamins and minerals, but many children and teens are still not getting adequate nutrition.

Fortification of foods with additional nutrients does have an impact on kids' intake of vitamins and minerals, but many children and teens are still not getting adequate nutrition, according to a new US study.

Based on a large national dietary survey, the researchers found that without fortification, the diets of a large number of children and teens would be nutritionally inadequate. With fortification the picture is better, but not perfect.

"Foods with added nutrients (most notably breakfast cereals, enriched grain foods, fluid milks) supplied important amounts of many but not all vitamins and minerals in diets of US children and adolescents," Louise Berner told Reuters Health in an e-mail.

Berner is a food science and nutrition researcher at Cal Poly State University in San Luis Obispo, California.

Read: What foods should I avoid?

Added calcium

Currently, the US Food and Drug Administration requires some fortification of food, such as enriching refined flour with vitamins and iron and adding vitamin A to low- and non-fat milk.

Food manufacturers may also add nutrients to food voluntarily – some brands of orange juice, for example, are fortified with added calcium.

Berner and colleagues wanted to find out both how much of an impact fortification has on kids' nutrition and determine which foods were providing the added nutrients.

Diet analysis

The researchers used data from the National Health and Nutrition Examination Survey to analyse the diets of 7 250 children and adolescents ages 2 to 18 years old.

Berner's team looked at the types of food eaten and any supplements taken and assessed the nutrient content of each food. Then they assessed how nutritionally adequate each kid's diet was by seeing whether it met Estimated Average Requirements (EAR).

The EAR is the average daily nutrient intake level estimated to meet the requirement of half the healthy individuals in a particular group based on age or gender.

On average, girls ages 14 to 18 years old were most likely to fall short of the EAR for their age, while boys and girls 2 to 8 years old had the lowest rates of inadequate nutrient intakes.

Read: 5 Nutrients every child needs

No excessive intake

The study team found that fortified foods contributed half or more of the intakes of vitamin D, thiamin, and folate to children's diets; 20% to 47% of the intakes of vitamin A, vitamin C, riboflavin, niacin, B-6, B-12, and iron; 12% to 18%of the intake of zinc; but only 4.5% to 6.6% of calcium.

Even with the increased nutrients from fortified sources, a substantial percentage of kids still had intakes of vitamins A, C and D that were less than the EAR for their age and sex.

The fortified foods also did not appear to lead to excessive intakes of any nutrients, which is a concern others have expressed in the past, Berner and her colleagues note in the Journal of the Academy of Nutrition and Dietetics.

The fortified foods that provided the most nutrients were breakfast cereals, milk and milk drinks, breads, rolls and other products made with enriched grains.

Not all fortified foods are healthy foods

"This research study provides a good picture of the contribution of fortified foods to kids' diets in the US," Berner said, "but, it should not be misinterpreted as a dietary recommendation to consumers – that was not the intent of the research.

Read: 10 foods rich in calcium

"So many unfortified foods, including fruits, vegetables, meats, fish and so forth, are critically important parts of healthful diets yet are often under-consumed," Berner said. "But, selectively, I think it makes sense – for example, choosing a fortified breakfast cereal instead of an unfortified one," she said.

Berner and her co-authors advise consumers to obtain nutrients primarily from foods that are naturally nutrient-dense. And, they point out, not all fortified foods are healthy foods.

Read more:

Fortifying staple foods with vital nutrients

Fortified milk may cut illnesses

Fish oil fortified nutrition bars

Low folate cuts cancer risk


Read Health24’s Comments Policy

Comment on this story
Comments have been closed for this article.

Live healthier

Exercise benefits for seniors »

Working out in the concrete jungle Even a little exercise may help prevent dementia Here’s an unexpected way to boost your memory: running

Seniors who exercise recover more quickly from injury or illness

When sedentary older adults got into an exercise routine, it curbed their risk of suffering a disabling injury or illness and helped them recover if anything did happen to them.