Writing in Nutrients, the authors stressed that no single nutrient is most important; instead, a complementary set of nutrients influences multiple developmental pathways, particularly during pregnancy when maternal nutrition impacts fetal development.
Rather than focusing on isolated outcomes, the paper examined brain development, the gut microbiome, and sleep together, arguing that these systems develop in parallel during the first 1,000 days and influence each other over time.
“What motivated this work was the clear gap between how integrated early development truly is and how often it continues to be studied in silos,” Devyani Chaturvedi, senior nutrition scientist at SmartyPants Vitamins and lead author of the review, told NutraIngredients.
“During the first 1,000 days, the brain, gut, and sleep systems are developing rapidly and in constant interaction, yet research and clinical discussions frequently treat them as separate domains.”
Bringing systems into one model
The authors refer to this as a ‘brain–gut–sleep triad,’ but the concept itself builds on existing research across multiple fields. Chaturvedi said the goal was to reflect how these systems actually develop in practice, rather than how they are often studied.
“What is fundamentally new about the brain-gut-sleep triad is its explicit integration of neuroscience, microbiome science, and sleep physiology into a single developmental model influenced by nutrition,” she said.
“This framework instead positions them as an interconnected, co-regulating network during the first 1,000 days.”
The review describes these systems as working in both directions, noting that they “exert reciprocal influences on each other and play a pivotal role in shaping lifelong cognitive, emotional, and behavioral trajectories.”
The authors point to nutrition as one of the few modifiable factors that can act across all three at once, particularly during early development.
Implications for formulation
The shift is less about identifying new ingredients and more about how products are framed and developed, Chaturvedi noted.
Much of the prenatal category remains focused on single nutrients linked to specific outcomes. Chaturvedi said that this approach may overlook how nutrients function across multiple pathways simultaneously.
“It is limiting because early development does not happen one system at a time,” she said.
“If we only focus on a single nutrient or a single outcome, we risk missing the broader systems-level effects nutrition may have,” she added, referring to brain growth, gut microbiome development and sleep architecture.
She noted that a more integrated view may also have implications for how products are substantiated, including considerations around nutrient forms, bioavailability and dosing in real-world conditions.
No single ‘hero’ nutrient
The review brings together evidence on several nutrients that are present across these systems, including omega-3 fatty acids, choline, folate, iodine, vitamin B12, iron, vitamin D, and probiotics.
Rather than elevating any one ingredient, the analysis points to overlapping roles across multiple pathways. Chaturvedi said this reflects the biology of early development, in which nutrients tend to act in combination rather than in isolation.
“Rather than identifying a single ‘most important’ nutrient, the evidence points to the importance of a complementary set of nutrients,” she said.
Maternal nutrition and early development
Maternal nutrition remains a central factor throughout the paper, particularly during pregnancy when fetal development depends on maternal nutrient stores.
Chaturvedi said nutritional adequacy during this period can shape multiple systems at once, including early brain development, gut microbial maturation and pathways linked to sleep regulation.
“The review highlights a growing body of research showing that maternal nutritional status during pregnancy directly influences infant development,” she said.
Evidence gaps remain
At the same time, the authors point to limitations in the current evidence base, particularly in linking these systems over time.
Chaturvedi said a lack of integrated, longitudinal research continues to limit the translation of findings into guidance for both clinicians and product developers.
“Two of the biggest gaps we identified were the need for evidence based, clear nutrient recommendations for early childhood,” she said, highlighting the need for more longitudinal studies exploring the links between nutrition, microbiome development, sleep, and cognitive outcomes together rather than separately.
Source: Nutrients, 2026, 18, 445. doi: 10.3390/nu18030445. “Interconnected Developmental Trajectories of the Brain, Gut, and Sleep in Early Life: The First 1000 Days of Nutritional Opportunity.” Authors: D. Chaturvedi, et al.
