NIH Prioritizes Human-Relevant Research Methods for Dietary Supplements and Nutrition

What's new

The National Institutes of Health (NIH) is actively promoting a shift in how research is conducted on dietary supplements and nutrition. The agency has highlighted a new focus on "New Approach Methodologies" (NAMs) that are more directly relevant to human biology and health [1]. This initiative seeks to address limitations of traditional research, such as animal studies, which may not always accurately translate to human physiology, metabolism, or dietary exposure patterns [1].

The NIH is particularly interested in research that develops and validates human-based NAMs, including organoids, tissue chips, microphysiological systems, multi-omics technologies, and computational models. The goal is to evaluate the safety and efficacy of foods, food components, and dietary supplements for optimizing health and reducing the risk of chronic diseases across the lifespan [1]. This push aligns with broader efforts by agencies like the Environmental Protection Agency (EPA) and the Food and Drug Administration (FDA) to integrate NAMs into their research frameworks [1].

The science behind it

Traditional research methods in diet and food safety often rely on animal models or population-level studies, which can have inherent limitations. Animal studies, while valuable, may not perfectly mimic human metabolic processes or responses to complex dietary exposures. Population studies, on the other hand, can be broad and lack the sensitivity to detect subtle, chronic, or age-specific effects of dietary components [1]. Furthermore, these methods can struggle to assess the intricate effects of complex foods, novel ingredients, or various food processing techniques [1].

NAMs offer a promising alternative by providing more human-relevant models. For instance, organoids and tissue chips can replicate the structure and function of human organs or tissues in a controlled laboratory setting, allowing for direct observation of how nutrients or bioactive compounds interact with human cells [1]. Multi-omics technologies (genomics, proteomics, metabolomics) can provide a comprehensive view of biological changes at a molecular level in response to dietary interventions. Computational models can integrate vast datasets to predict long-term effects and complex interactions within the human body [1].

The NIH's objectives for NAMs include investigating absorption, distribution, and metabolic processes of nutrients and bioactive compounds across multiple physiological systems. Researchers are encouraged to simulate and predict how cellular, organ, and body systems interact in response to complex food or dietary supplement matrices [1]. High-priority research areas involve identifying and validating human-relevant biomarkers, generating replicable data on nutrient absorption and metabolism across diverse populations, and quantifying the bioaccessibility and bioavailability of compounds, especially in multi-ingredient products [1]. Studies assessing interactions between dietary components and cellular/tissue/organ functions, investigating mechanisms of action, and characterizing the impact of dietary substances on developmental processes are also emphasized [1].

What it means in practice

For consumers, this renewed focus on human-relevant research means that future dietary supplement and nutrition recommendations may be based on more precise and applicable scientific evidence. By using NAMs, researchers can gain a deeper understanding of how specific nutrients, bioactive compounds, and complex food matrices affect human health at a cellular and systemic level [1]. This could lead to more tailored and effective dietary advice, as well as the development of safer and more efficacious dietary supplements.

For example, NAMs could help clarify how multi-ingredient supplements interact within the body, how processing affects nutrient availability, or how individual genetic variations influence metabolic responses to diet [1]. This could be particularly impactful for vulnerable populations, such as pregnant individuals, infants, or the elderly, by providing better insights into the potential risks and benefits of dietary exposures during critical life stages [1]. The participating NIH institutes, including the Office of Dietary Supplements (ODS), National Cancer Institute (NCI), National Eye Institute (NEI), National Heart, Lung, and Blood Institute (NHLBI), and National Institute on Aging (NIA), are all interested in applying NAMs to their specific areas of focus, from cancer prevention to ocular health and aging [1]. This collaborative approach aims to accelerate the translation of research findings into practical health improvements.

Caveats

While NAMs offer significant advantages in terms of human relevance and ethical considerations (by potentially reducing reliance on animal testing), they also present challenges. The development and validation of these complex models require substantial scientific expertise and resources. Ensuring that these in vitro or computational models accurately reflect the full complexity of the human body, including interactions between different organ systems and environmental factors, is an ongoing scientific endeavor [1].

Translating findings from NAMs into definitive clinical recommendations still requires careful interpretation and, in many cases, eventual confirmation through human clinical trials. The NIH's initiative is a call for proposals to advance these methodologies, indicating that this is an evolving field with much research still needed to fully establish and integrate NAMs into standard practice for dietary supplement and nutrition research [1]. The success of this approach will depend on rigorous validation and the ability to generate reproducible and interoperable datasets across different research settings [1].

Source: [1] https://grants.nih.gov/funding/find-a-fit-for-your-research/highlighted-topics/62