Fried and Processed Foods Linked to Poor Sleep in Preschoolers, Study Finds

A new study suggests that the very foods many toddlers and preschoolers eat every day — nuggets, fries, baked snacks, and other heat-processed staples of the modern childhood plate — may be quietly interfering with their sleep. Researchers in Türkiye report that young children who consume higher amounts of dietary advanced glycation end products, a class of compounds formed when foods are cooked at high temperatures, are significantly more likely to suffer from sleep disturbances. The findings, published in BMC Pediatrics, add a surprising new dimension to the ongoing conversation about how ultra-processed diets shape children’s health, pointing to a potential link between what happens to food under heat and how well a three-year-old sleeps at night.

Advanced glycation end products, commonly abbreviated as AGEs, are a heterogeneous group of compounds that form naturally in the body when sugars react with proteins or fats, a process known as glycation. They also enter the body through the diet, particularly from foods exposed to high, dry heat — grilling, frying, roasting, and baking all accelerate their formation. Measured in the diet as dAGEs and typically expressed in kilounits per kilocalorie (kU/kcal), these compounds have been implicated in chronic inflammation and oxidative stress in adults. The receptor for advanced glycation end products, known as RAGE, can activate inflammatory signaling pathways such as nuclear factor kappa B (NF-κB), and previous research has suggested that high dietary AGE intake could influence sleep quality through several different mechanisms, including inflammatory and metabolic pathways.

Despite growing interest in how AGEs affect adult health, almost nothing has been known about their impact on young children, whose developing nervous systems and sleep architecture may be especially vulnerable. To address that gap, a team of nutrition and dietetics researchers — Gökçen Doğan of Lokman Hekim University, Büşra Demirer of Karabuk University, and Nurcan Yabanci Ayhan of Ankara University — designed an observational cross-sectional study to evaluate whether dietary AGE intake is associated with sleep disorders in preschool-aged children. The study was retrospectively registered as NCT07062640 and received ethics approval from Karabuk University in accordance with the Declaration of Helsinki, with written and verbal informed consent obtained from a parent for each participant.

The researchers enrolled 304 children between the ages of three and five, a group that was 46.05 percent female and 53.95 percent male. Parents completed a detailed questionnaire administered through face-to-face interviews, covering sociodemographic information, the child’s eating habits, and a 24-hour diet record form that allowed the team to calculate the average daily dAGE intake in kU/kcal. Sleep problems were assessed with the Sleep Disorders Scale for Children, a validated instrument known as the SDSC that screens for a range of sleep difficulties in young children. This combination of tools allowed the investigators to quantify both sides of the equation — how much dietary AGE each child consumed and how disturbed their sleep actually was.

The results were striking. According to the SDSC, 67.4 percent of the participating children had sleep disorders, a prevalence that underscores how common sleep problems are in the preschool years. When the researchers compared dietary intake between the two groups, they found that children with sleep disorders consumed an average of 6.22 ± 1.88 kU/kcal of dietary AGEs, while children with normal sleep consumed 4.79 ± 1.32 kU/kcal. That difference was statistically significant, with a p-value below 0.001. Average intake was nearly identical across the sexes — 5.76 ± 1.81 kU/kcal in girls and 5.74 ± 1.87 kU/kcal in boys — indicating that the association was not simply a matter of one sex eating differently from the other.

To make sure the association was not being driven by confounding factors, the team built a logistic regression model adjusted for the child’s age, sex, body mass index, and the age at which complementary foods were first introduced. Even after accounting for those variables, higher dietary AGE intake remained independently associated with sleep disorders: each increase in intake corresponded to 1.76-fold higher odds of having a sleep disturbance (odds ratio 1.763; 95 percent confidence interval 1.418–2.117; p < 0.001). In practical terms, children eating the most AGE-rich diets had nearly twice the odds of disrupted sleep compared with those eating the least, a substantial effect for a single dietary factor in an observational study.

Why would compounds created by cooking heat affect a child’s sleep? The authors point to several plausible mechanisms. Dietary AGEs can promote systemic inflammation and oxidative stress, and chronic low-grade inflammation has been repeatedly linked to disrupted sleep regulation. The interaction of AGEs with RAGE triggers NF-κB signaling, a master switch of inflammation that could, in theory, perturb the neural and hormonal systems that govern sleep-wake cycles. Metabolic disturbances are another candidate pathway, since sleep quality is tightly entwined with glucose metabolism and hormonal balance. The study’s related subject areas — including orexin, a neuropeptide central to arousal and wakefulness — hint at the broader neurobiological territory where diet and sleep may intersect, though the cross-sectional design of this study cannot confirm which mechanisms are actually at work.

The researchers themselves are careful about what the findings do and do not prove. Because the study is cross-sectional, it captures a single moment in time and cannot establish whether high AGE intake causes sleep problems, whether children who sleep poorly gravitate toward certain foods, or whether some third factor influences both. The authors conclude that the findings highlight the potential clinical relevance of dietary AGE exposure as a modifiable dietary factor in relation to sleep health among preschool children, and they suggest that dietary assessment — including consideration of cooking practices — may be relevant when evaluating children with sleep disturbances. But they explicitly note that longitudinal and intervention studies are needed to clarify the direction and causality of the association. No funding was received for the research, and the authors declare no competing interests.

Even with those caveats, the study lands at a moment when parents and pediatricians are increasingly worried about both childhood sleep and the ubiquity of heat-processed foods in young children’s diets. Sleep disturbances in preschoolers are associated with behavioral problems, impaired learning, and metabolic risk later in life, and the new finding that two-thirds of a typical preschool sample screened positive for sleep disorders is itself a sobering data point. If the AGE-sleep link holds up in future research, it would suggest that something as simple as cooking method — swapping fried and heavily roasted foods for steamed, boiled, or stewed alternatives, which generate far fewer AGEs — could become a low-cost lever for improving children’s sleep. The study, published open access in BMC Pediatrics on 8 October 2026, offers no prescriptions yet, but it opens an intriguing line of investigation into how the chemistry of cooking may reach all the way into a child’s bedroom at bedtime.

For now, the practical takeaway is one of awareness rather than alarm. The study does not identify specific foods to banish from the family table, and its authors stop short of any clinical recommendation. What it does provide is a measurable, testable hypothesis: that dAGE intake, quantified in kU/kcal from a 24-hour diet record, tracks with sleep health in children as young as three. With odds ratios approaching twofold and a highly significant p-value, the signal is strong enough to warrant serious follow-up. Whether the culprit is inflammation, oxidative stress, metabolic disruption, or some combination of the three, the idea that a modifiable dietary factor might influence preschool sleep is a compelling target for the longitudinal and intervention studies the researchers say must come next — studies that could eventually transform advice about children’s dinners into advice about their dreams.

Subject of Research: The association between dietary advanced glycation end products and sleep disturbances in preschool children

Article Title: Association between dietary advanced glycation end products and sleep disturbances in preschool children: a cross-sectional study

Article References: Doğan, G., Demi̇rer, B., & Ayhan, N. Y. (2026). Association between dietary advanced glycation end products and sleep disturbances in preschool children: a cross-sectional study. BMC Pediatrics. https://doi.org/10.1186/s12887-026-07811-5

Image Credits: AI Generated

DOI: 10.1186/s12887-026-07811-5

Keywords: advanced glycation end products, sleep disturbances, preschool children, pediatric nutrition, cross-sectional study, dietary assessment, inflammation, oxidative stress, cooking methods, processed foods, sleep disorders scale for children, BMC Pediatrics