A new cohort study finds that women who ate more mushrooms during pregnancy had children with measurably better social behaviour at age five. The proposed mechanism points straight to vitamin D and serotonin.
A new paper published in the Journal of Human Nutrition and Dietetics, drawing on data from Japan’s Kyushu Okinawa Maternal and Child Health Study (KOMCHS), report that the more mushrooms a woman ate during pregnancy, the less likely her child was to struggle socially at age five.
Higher mushroom intake was associated with reduced risk of “peer problems” (difficulty making friends, being picked on, preferring solitude) and reduced risk of “low prosocial behaviour” (being less considerate, less willing to share, less helpful). No significant associations emerged for emotional problems, conduct problems, or hyperactivity.
The study
The research team used the Strengths and Difficulties Questionnaire (SDQ), a well-validated parent-reported tool, to assess behaviour in children aged 59 to 71 months. Dietary intake during pregnancy was assessed via a comprehensive diet history questionnaire covering 150 foods.
Mothers were divided into four quartiles based on mushroom intake. The lowest quartile consumed less than 4.6 g per day; the highest consumed 15.9 g or more. Children of mothers in the top quartile had a 42% lower adjusted odds of peer problems (OR 0.58, 95% CI 0.31-1.07) and a 36% lower odds of low prosocial behaviour (OR 0.64, 95% CI 0.43-0.95) compared with the bottom quartile, after adjustment for a substantial list of confounders including maternal depression, smoking, breastfeeding duration, household income, education, and birth weight.
The dose-response trend was statistically significant for both outcomes (p for trend = 0.02 in each case). This means risk decreased progressively as intake increased across all four quartiles, not just at the extreme. That pattern is an important mark of a potentially causal relationship.
Vitamin D and the serotonin pathway
The authors ran an additional analysis to test whether the association could be explained by the B vitamins and folate known to exist in mushrooms. It could not. After separately adjusting for vitamin C, folate, and vitamin B6, the effect on prosocial behaviour held. That finding points the finger at something else in the mushroom matrix.
The leading candidate is vitamin D. Mushrooms are one of the rare dietary sources of vitamin D, and the hypothesis here is mechanistically coherent. Vitamin D regulates the expression of tryptophan hydroxylase genes (TPH1 and TPH2), which control serotonin synthesis in the gut and brain respectively. Serotonin, in turn, is a key regulator of prosocial behaviour and social cognition.
Supporting evidence from other cohorts strengthens this interpretation. A Philadelphia study of 300 children found that vitamin D deficiency significantly amplified the negative effects of early social adversity on antisocial outcomes. Separately, the ECHO cohort study found that lower maternal vitamin D concentrations predicted more behavioural problems in early childhood. The KOMCHS findings slot neatly into this emerging picture.
“Vitamin D may play a role in protecting children with social risk against antisocial behaviour through its regulation of serotonin synthesis.”
Ergothioneine
One candidate the study could not test is ergothioneine, a sulfur-containing antioxidant found almost exclusively in fungi, for which humans carry a dedicated cellular transporter (OCTN1) expressed in brain tissue.
The Japanese food composition database used by the researchers did not capture ergothioneine values, so it was invisible to the analysis rather than ruled out. Its primary mechanism is mitochondrial protection and neuroinflammation reduction, and given that the fetal brain during late gestation is both metabolically intense and oxidatively vulnerable, a case can be made that maternal ergothioneine status influences the quality of neural tissue laid down during that window.
Why we should care
To the authors’ knowledge, this is the first epidemiological study to examine maternal mushroom intake and child behaviour. Most nutritional epidemiology in this space focuses on individual micronutrients. Studying a whole food like mushrooms is harder but arguably more useful, because it captures the synergistic complexity of what people actually eat.
It also adds to a larger, building body of evidence that mushrooms are not merely a culinary ingredient but a functional food with genuine neurodevelopmental relevance. Previous research from the same KOMCHS dataset has linked maternal vitamin B2, calcium, and magnesium intake to reduced emotional and hyperactivity problems in children. The mushroom finding extends that logic further into the social domain.
Common edible species of mushroom contain a range of bioactive compounds including beta-glucans, ergothioneine, phenolics, and nucleic acid derivatives, alongside the vitamin D precursors in question here. The fungal kingdom is operating on us through many channels simultaneously.
The takeaway
What makes this finding interesting at a deeper level is not just the practical implication (eat mushrooms during pregnancy). It is what the specificity of the outcome tells us about brain development. Prosocial behaviour and peer relationship capacity are not generic cognitive functions.
They map onto specific neural circuits, particularly those involving serotonergic signalling in the prefrontal cortex and amygdala, circuits that are being laid down in the fetal period and that are known to be sensitive to nutritional status.
The fact that mushroom intake specifically predicted peer and prosocial outcomes, but not emotional reactivity or hyperactivity, suggests we may be looking at targeted influence on the development of social cognition rather than broad neurodevelopmental noise. It deserves the follow-up work the authors are asking for.
Source: Nguyen MQ, Miyake Y, Tanaka K, et al. Maternal Mushroom Consumption During Pregnancy Is Associated With Decreased Risk of Peer Problems and Decreased Risk of Low Prosocial Behavior in 5-Year-Olds. Journal of Human Nutrition and Dietetics. 2026;39:e70222. doi.org/10.1111/jhn.70222
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