Maternal intake of sweetened carbonated beverages may be associated with children’s ADHD symptoms

Norwegian, Swedish and Dutch researchers examining a large Norwegian population-based cohort recently reported in European Journal of Nutrition that daily maternal intake of sweetened carbonated beverages (SCB) in pregnancy was associated with an increase in ADHD symptoms among offspring at 8 years of age.

The magnitude of associations in the study was weak (typically 15-21% increased relative risk of offspring having 6 or more ADHD symptoms), suggesting SCB only play a minor role in the aetiology of ADHD. However, further research into causal agents is warranted, as SCB are common exposures, and even a little reduction of risk may still be of importance for children’s ADHD symptoms at the population level.

ADHD is a complex multifactorial disorder where both genes and environment contribute to its development. However, the exact cause of the disorder is still elusive.

Data from national MoBa-study

This study was based on data from the Norwegian Mother, Father and Child Cohort Study (MoBa) and the Medical Birth Registry of Norway (MBRN). MoBa is a large prospective population-based pregnancy cohort study conducted by the Norwegian Institute of Public Health. Participants were recruited from across Norway during 1999-2008. The women consented to participation in 41% of the invited pregnancies. Participating women answered three questionnaires during pregnancy, of which the second was a food frequency questionnaire, introduced in 2002, and completed during mid-pregnancy.

After delivery, questionnaires were forwarded to the family when the child was 6 months, 18 months, and at 3, 5, 7 and 8 years, as well as further questionnaires when the child is a teenager. The cohort now includes 114 500 children, 95 200 mothers and 75 200 fathers. For theMoBa pregnancies, data are routinely linked to the MBRN, a national health registry based onmandatory reporting of information on pregnancies and birth outcomes for all births in Norway since 1967.

The study population consisted of 39870 mother-child pair of mothers who responded to the food frequency questionnaire and a questionnaire when their child was 8 years of age. The exposure was defined as maternal intake (daily servings) of SCB (sugar- and artificially sweetened), using no daily intake as reference. The outcome in the study was offspring ADHD symptoms, evaluated as a continuous standardized ADHD score and as a binary outcome of six or more ADHD symptoms vs. five symptoms or less.

More research needed

Associate professor Liv Grimstvedt Kvalvik at the University of Bergen is first author of the study. She explains that the authors adjusted for possible factors that could explain the associations such as maternal educational level, maternal pre-pregnancy body mass index, maternal depression and anxiety, maternal ADHD symptoms, other components of the maternal diet, maternal age at delivery, parity, birth year and season.

This study is an observational study and conclusions about causality cannot be drawn with certainty, and residual confounding by for instance life-style factors or medical conditions not accounted for may be present. On the other hand, the longitudinal design with prospectively collected data, strengthens the results and their interpretation. While this study suggests that daily maternal intake of SCBs could be linked to a small increase in ADHD symptoms in offspring at 8 years of age, further research is needed to explore this association.

EU-funded

This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 728018. The study is part of a research consortium “Effects of Nutrition and Lifestyle on Impulsive, Compulsive, and Externalizing Behaviours (Eat2beNICE)” that is using different methods and datasets to study connections between gut microbiota, diet, and exercise to formulate nutrition and lifestyle recommendations for brain health. This article reflects only the author’s views and the European Union is not liable for any use that may be made of the information contained therein.

Source:

Journal reference:

Kvalvik, L. G., et al. (2022) Association of sweetened carbonated beverage consumption during pregnancy and ADHD symptoms in the offspring: a study from the Norwegian Mother, Father and Child Cohort Study (MoBa). European Journal of Nutrition. doi.org/10.1007/s00394-022-02798-y.

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