Is Picky Eating a Sign of Intelligence? What the Research Shows

Picky eating is not a reliable sign of intelligence. The claim traces mostly to one dairy-industry-funded study of 793 Chinese children, where picky eaters scored about 2.7 IQ points higher (roughly 0.18 standard deviations), while larger and newer studies link persistent picky eating to slower development and to genes associated with less education.

Picky eating is very common, especially in toddlers, and usually fades on its own. This page covers what the IQ studies found, why some children and adults are pickier than others, how taste genetics and personality fit in, and when selective eating becomes a feeding disorder called ARFID. It describes research and is not medical or dietary advice.

Only a handful of studies have put picky eating and intelligence scores side by side.

• The study behind the claim: Yong Xue and colleagues recruited 793 healthy children aged 7 to 12 from nine Chinese cities and rural areas and tested them with the Wechsler Intelligence Scale for Children. Parents described 59.3% of the children as picky eaters. After adjusting for birth weight, food allergy, mother's education and family income, picky eaters scored 2.7 points higher on the IQ test (95% confidence interval 0.8 to 4.6). The same children ate less energy and protein, had lower blood iron and magnesium, and were shorter and lighter for their age. The study was cross-sectional, a single snapshot, and it was funded by Mengniu Dairy, which also employed one of the authors. When nearly six in ten children are labelled picky, the label may say as much about parents' expectations as about the children.

• Food neophobia and executive function: A 2026 longitudinal study in Child Development followed 113 French preschoolers over a school year. Children whose caregivers rated them higher in "food neophobia", the reluctance to try new foods, at the start of the year scored lower later on executive-function tasks (standardized β = -0.20) and on a food categorization task (β = -0.26), after controlling for earlier scores. The reverse path was not found. The sample is small and executive function is a narrower outcome than IQ. Even so, the direction is the opposite of the popular claim.

• Restrictive eating in 35,751 Norwegian children: Ludvig Daae Bjørndal and colleagues used the Norwegian Mother, Father and Child Cohort Study to identify children with avoidant or restrictive eating at ages 3 and 8. Children whose restrictive eating persisted at both ages showed more mother-reported difficulties in language and motor development from infancy through age 14. In genetic analyses, restrictive eating had negative genetic correlations with educational attainment, ranging from -0.15 to -0.37. Education and IQ are strongly linked, so this also points away from a "picky means smart" story.

No randomized study is possible here, and none of these designs show that picky eating changes intelligence in either direction. The point is narrower: the one positive finding has not been repeated, and the larger datasets lean the other way.

The Generation R study in Rotterdam followed 4,018 children and asked mothers about picky eating at 1.5, 3 and 6 years. About 26.5% were picky at 18 months and 27.6% at age 3, falling to 13.2% at age 6. Nearly half of all children were picky at some point, but only 4% were picky at every assessment. Persistent picky eating was more common in boys, in children with lower birth weight and in families with lower income.

The same research group then asked teachers about the children's behaviour at age 7. Children who were picky at all three ages were about twice as likely to show "pervasive developmental problems", a category that overlaps with autism traits (odds ratio 2.00). Picky eating that came and went was not linked to later problems. The authors concluded that early picky eating is usually a normal phase.

Selective eating is especially common in autism. A meta-analysis of 17 studies found that autistic children were about five times as likely as their peers to have feeding problems (odds ratio 5.11). Autism spans the full range of intelligence, so this link says nothing about IQ on its own; our page on IQ and autism covers that relationship.

Genes play a large part. In a study of 1,921 families with 16-month-old twins, about 46% of the variation in food fussiness and 58% of the variation in food neophobia was attributable to genetic differences, with shared family environment explaining much of the rest of fussiness. In adults, a Finnish family sample and a British twin sample both put the heritability of food neophobia at about two thirds.

Taste differs between people too. Linda Bartoshuk's laboratory identified "supertasters", people who rate the bitter chemical PROP as intensely bitter. They also perceive stronger tastes from other bitter and sweet substances and have more taste buds on the front of the tongue. Adults who call themselves picky eaters rate both bitter and sweet solutions as more intense than non-picky eaters do. In the same study, picky adults scored higher on disgust sensitivity and obsessive-compulsive symptoms and were more likely to report clinically significant depressive symptoms. A sensitive palate is a sensory difference. It has no known link to reasoning ability.

Among adults, the evidence on education runs against the popular idea. In a representative Finnish sample of 1,083 people, food neophobia scores fell as education rose. A Swiss survey of 4,436 adults found the same pattern, with less neophobia among people with more income and education. Education is an imperfect stand-in for IQ, and these are correlations in which age and urban living also played a role, but there is no sign in them that pickiness tracks higher ability.

Most picky eating is a normal stage. A small share of children and adults have avoidant/restrictive food intake disorder (ARFID), a diagnosis added in DSM-5. The manual describes avoidance or restriction of food that leads to one or more of significant weight loss or faltering growth, nutritional deficiency, dependence on supplements or tube feeding, or marked interference with daily life. The eating problem is not explained by a lack of food or a cultural practice, and unlike anorexia nervosa it does not involve concern about body weight or shape. Our page on anorexia nervosa and IQ covers that separate condition.

In the Norwegian cohort, about 6.3% of children met a broad definition of restrictive eating with at least one sign of clinical significance, such as a nutritional deficiency. A Duke University study of 917 preschoolers found that moderate and severe selective eating were both linked to symptoms of anxiety, depression and ADHD, and the symptoms were worse when selective eating was more severe.

Parents who are worried that a child's eating is affecting growth, energy or family life should speak with a paediatrician or family doctor, who can check growth and nutrition and refer to a specialist eating-disorder or feeding team where needed. For the wider question of what diet can and cannot do for intelligence, see our overview of whether diet or nutrition affects IQ.

No. One study of 793 Chinese children found picky eaters scored 2.7 IQ points higher, but it was a single snapshot funded by a dairy company, and larger studies link persistent picky eating to slower development instead.

Many are. Adults who describe themselves as picky rate bitter and sweet tastes as more intense, and "supertasters" find the bitter chemical PROP far stronger than other people do, but these differences are not linked to intelligence.

Partly. Twin studies attribute roughly half of the variation in toddlers' food fussiness, and about two thirds of the variation in adults' reluctance to try new foods, to genetic differences.

Most do. In the Generation R study, almost two thirds of early picky eaters were no longer picky by age 6, and only 4% of children were picky at every assessment.

Avoidant/restrictive food intake disorder is an eating disorder in which restricted eating causes problems such as weight loss, nutritional deficiency or marked difficulty with daily life, without concern about body shape. A doctor or specialist eating-disorder team can assess it.

Picky eating is not a sign of intelligence. The popular claim rests on one cross-sectional, industry-funded study with a small effect, while larger studies tie persistent restrictive eating to developmental difficulties and to genes associated with less education. Picky eating mostly reflects temperament and a sensitive palate, and in children it usually passes. If you want to know where your reasoning ability actually stands, take the RIOT IQ test.

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Hero image: Broccoli and Cheese, by Renee Comet, National Cancer Institute, public domain. Via Wikimedia Commons.