"Many of these children had been examined when they were four years old, and we discovered that their eating habits were pretty much unchanged four years later. It appears to be the case that eating habits are established early", says Susanne Eriksson.

The thesis found that 62% of the children had low levels of vitamin D in their blood. The general guideline value for all people for vitamin D is 75-100 nmol/l, but most children had less than this. High levels of vitamin D are found in oily fish, while certain dairy products have been fortified with vitamin D. It can be difficult to obtain sufficient levels of the vitamin through the diet.

"We could not determine whether the children's level of vitamin D is correlated with their consumption of fish, but we did see that those children who ate oily fish, such as salmon and mackerel, at least once a week have higher values of the long-chain fatty acids EPA and DHA in their blood. This shows how important it is to eat such fish, instead of processed fish such as fish fingers", says Susanne Eriksson.

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