For women with antenatal depression, micronutrients might help them and their babies – new study

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Julia J Rucklidge, University of Canterbury; Elena Moltchanova, University of Canterbury; Roger Mulder, University of Otago, and Siobhan A Campbell, University of Canterbury

Antenatal depression affects 15% to 21% of pregnant women worldwide. It can influence birth outcomes and children’s development, as well as increase the risk of post-natal depression.

Current treatments like therapy can be inaccessible and antidepressants can carry risks for developing infants.

Over the past two decades, research has highlighted that poor nutrition is a contributing risk factor to mental health challenges. Most pregnant women in New Zealand aren’t adhering to nutritional guidelines, according to a longitudinal study. Only 3% met the recommendations for all food groups.

Another cohort study carried out in Brazil shows that ultra-processed foods (UPF) accounted for at least 30% of daily dietary energy during pregnancy, displacing healthier options.

UPFs are chemically manufactured and contain additives to improve shelf life, as well as added sugar and salt. Importantly, they are low in essential micronutrients (vitamins and minerals).

The consumption of these foods is concerning because a nutrient-poor diet during pregnancy has been linked to poorer mental health outcomes in children. This includes depression, anxiety, hyperactivity, and inattention.

Increasing nutrients in maternal diets and reducing consumption of UPFs could improve the mental health of the mother and the next generation. Good nutrition can have lifelong benefits for the offspring.

However, there are multiple factors that mean diet change alone may not in itself be sufficient to address mental health challenges. Supplementing with additional nutrients may also be important to address nutritional needs during pregnancy.

Micronutrients as treatment for depression

Our earlier research suggests micronutrient supplements for depression have benefits outside pregnancy.

But until now there have been no published randomised controlled trials specifically designed to assess the efficacy and safety of broad-spectrum micronutrients on antenatal depression and overall functioning.

The NUTRIMUM trial, which ran between 2017 and 2022, recruited 88 women in their second trimester of pregnancy who reported moderate depressive symptoms. They were randomly allocated to receive either 12 capsules (four pills, three times a day) of a broad-spectrum micronutrient supplement or an active placebo containing iodine and riboflavin for a 12-week period.

Micronutrient doses were generally between the recommended dietary allowance and the tolerable upper level.

Based on clinician ratings, micronutrients significantly improved overall psychological functioning compared to the placebo. The findings took into account all noted changes based on self-assessment and clinician observations. This includes sleep, mood regulation, coping, anxiety and side effects.

Pregnant woman looking out a window
Adding micronutrients to the diet of pregnant women with antenatal depression significantly improved their overall psychological functioning. Getty Images

Both groups reported similar reductions in symptoms of depression. More than three quarters of participants were in remission at the end of the trial. But 69% of participants in the micronutrient group rated themselves as “much” or “very much” improved, compared to 39% in the placebo group.

Participants taking the micronutrients also experienced significantly greater improvements in sleep and overall day-to-day functioning, compared to participants taking the placebo. There were no group differences on measures of stress, anxiety and quality of life.

Importantly, there were no group differences in reported side effects, and reports of suicidal thoughts dropped over the course of the study for both groups. Blood tests confirmed increased vitamin levels (vitamin C, D, B12) and fewer deficiencies in the micronutrient group.

Micronutrients were particularly helpful for women with chronic mental health challenges and those who had taken psychiatric medications in the past. Those with milder symptoms improved with or without the micronutrients, suggesting general care and monitoring might suffice for some women.

The benefits of micronutrients were comparable to psychotherapy but with less contact. There are no randomised controlled trials of antidepressant medication to compare these results.

Retention in the study was good (81%) and compliance excellent (90%).

Beyond maternal mental health

We followed the infants of mothers enrolled in the NUTRIMUM trial (who were therefore exposed to micronutrients during pregnancy) for 12 months, alongside infants from the general population of Aotearoa New Zealand.

This second group of infants from the general population contained a smaller sub-group who were exposed to antidepressant medication for the treatment of antenatal depression.

We assessed the neuro-behavioural development of each infant within the first four weeks of life, and temperament up to one year after birth.

These observational follow-ups showed positive effects of micronutrients on the infants’ ability to regulate their behaviour. These results were on par with or better than typical pregnancies, and better than treatments with antidepressants.

Baby eats fruits and berries with their hand
Micronutrients during pregnancy improved the neurological and behavioural development of infants. Getty Images

Infants exposed to micronutrients during pregnancy were significantly better at attending to external stimuli. They were also better able to block out external stimuli during sleep. They showed fewer signs of stress and had better muscle tone compared to infants not exposed to micronutrients.

They also displayed greater ability to interact with their environment. They were better at regulating their emotional state and had fewer abnormal muscle reflexes than infants exposed to antidepressant medication in pregnancy.

Reassuringly, micronutrients had no negative impact on infant temperament.

These findings highlight the potential of micronutrients as a safe and effective alternative to traditional medication treatments for antenatal depression.

The prenatal environment sets the foundation for a child’s future. Further investigation into the benefits of micronutrient supplementation would gives us more confidence in their use for other perinatal (from the start of pregnancy to a year after birth) mental health issues. This could provide future generations with a better start to life.

We would like to acknowledge the contribution of Dr Hayley Bradley to this research project.

Julia J Rucklidge, Professor of Psychology, University of Canterbury; Elena Moltchanova, Professor of Statistics, University of Canterbury; Roger Mulder, Professor of Psychiatry, University of Otago, and Siobhan A Campbell, Intern Psychologist, Researcher – Te Puna Toiora (Mental Health and Nutrition Research Lab), University of Canterbury

This article is republished from The Conversation under a Creative Commons license. Read the original article.

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