The Rise of Personalized Nutrition

Personalized nutrition (PN) is no longer a fringe idea—it’s entering the mainstream. Studies as early as two-week interventions with twins revealed dramatically different blood sugar and insulin responses to the same meals, underscoring the need to tailor dietary advice to the individual rather than rely on one-size-fits-all guidelines.1,2 The U.S. federal dietary guidelines take this approach, but given recent research it is becoming clear that this is no longer working and needs to change. The global PN market, valued at around $17.9 billion in 2025 and projected to exceed $60 billion by 2034, is accelerating rapidly with an anticipated CAGR of ~14-15 percent.3 This growth reflects a convergence of tech innovation, consumer demand for individualized wellness solutions, and mounting science validating unique responses to food.

This is where NutriSelect.ai comes in: their platform is redefining how consumers evaluate, discover and trust dietary supplements. At the heart of their innovation is Precision Supplement Intelligence, a patent-pending AI engine that systematically analyzes clinical research, brand transparency and individual biology to generate objective, science-based supplement ratings and personalized recommendations.

In addition, functional foods—nutritive foods enhanced or formulated for health beyond basic nutrition—offer a scalable route to personalized wellness. When you pair functional ingredients with advanced data analytics, you can tailor formulations to match unique microbiome signatures, genetic predispositions and lifestyle patterns.

At the core of this approach lies the gut microbiome—a dynamic ecosystem that significantly influences how individuals metabolize food and respond to functional ingredients.4 A recent six-week pilot of an AI-guided PN app showed improvements in microbial richness and diversity (e.g., Oscillospiraceae and Lachnospiraceae shifts correlated with olive oil intake), illustrating how diet informed by biological data can measurably modulate gut health.5,6

By delivering functional ingredients—such as specific prebiotics, fermented matrices or bioactive nutrients—matched to microbiome profiles and metabolic needs, we can not only support gut wellness, but also optimize immune resilience, cognitive vitality and metabolic balance. NutriSelect.ai sits at that junction: where data science, omics insights and supplement development converge to enable truly PN.

Understanding PN

PN is a science-based approach that moves beyond universal dietary guidelines to tailor recommendations based on an individual’s genetic profile, microbiome composition, lifestyle behaviors and health conditions.7 Nutrigenomics and nutrigenetics explore how genetic variations affect responses to nutrients—like MTHFR gene variants influencing folic acid metabolism—and support developing tailored dietary plans for optimal health outcomes.8

Today’s PN field leverages cutting-edge technologies including DNA testing, microbiome sequencing and wearable devices/apps to gather real-time data.

• Genetic and multi-omics analysis generates insights into nutrient metabolism, food sensitivities and metabolic health pathways.9

• Microbiome profiling reveals how the composition and function of gut flora shape individual dietary responses.10

• Wearables and health-tech platforms—such as CGMs, activity/sleep trackers and mobile apps—capture dietary patterns, metabolic responses, and lifestyle behaviors to build adaptive, real-time nutrition guidance.11

The gut microbiome—comprising bacteria, archaea, fungi, viruses and their collective genetic material—operates as a dynamic biochemical ecosystem intimately linked to host metabolism, immune function and even brain signaling. Research shows that diet reshapes microbial communities, and in turn, those microbiomes determine how individuals respond to the same food differently.

Functional Foods as a Vehicle for PN

Functional foods formulations enhanced with specific bioactives can be purpose-built to target individual health goals like gut support, immunity or cognitive clarity. Reviews have shown that ingredients such as specific prebiotics, probiotics, fibers, polyphenols and postbiotics effectively modulate the microbiome, improve immune responses and support neurointestinal health.12 For example, foods enriched with prebiotics can boost short-chain fatty acid production, strengthen gut barrier integrity and reduce inflammation—key mechanisms for personalized immune and metabolic support.

Companies are now creating precision formulations tailored to individual biological profiles. Probiotic starter cultures, especially lactic acid bacteria strains, are selected based on their action in specific host microbiomes or immune contexts.13 Advanced strategies include engineered probiotics crafted through gene editing (CRISPR, TALEN) to deliver targeted enzymes, vitamins or signaling molecules that align with specific metabolic or health needs.14 Prebiotic fibers, such as fructooligosaccharides (FOS), inulin and xylooligosaccharides (XOS), are widely used to selectively nurture beneficial bacteria, tailored to promote optimal gut ecology and host health parameters.

Innovative delivery formats amplify personalization by meeting consumer preferences and lifestyle needs. Customized meal kits, snack bars, functional shakes and sip-down shots allow consumers to consume gut-targeted or immune-supporting ingredients in convenient, format-specific ways. Formulations harness microencapsulation techniques to preserve viability and stability of sensitive ingredients (e.g., probiotics, polyphenols) through processing and digestion.15 This also enables timed or sustained release of prebiotics or probiotics tailored to individuals’ metabolic or gut transit profiles.

Delivering functional foods in these flexible formats allows brands to align product design with consumer behavior, dietary lifestyles and personalized health plans—from morning shakes personalized for microbiome diversity to on-the-go snack bars formulated for cognitive support or immune resilience.

Technology-enabled Personalized Functional Foods

Consumer-accessible microbiome testing kits—like Viome and DayTwo—are enabling personalized food recommendations predicated on individual gut microbial functionality. Viome, for instance, uses metatranscriptomic (RNA expression) analysis of stool and blood samples coupled with AI interpretation to offer personalized dietary suggestions based on gut function and health markers.16 These platforms help identify which foods may foster beneficial microbial activity in each person—informing formulating functional foods tailored to individual gut profiles.17

AI and machine learning are increasingly central to constructing personalized nutritional guidance. Recent reviews highlight systems that ingest personal health data—including genomic, metabolic, microbiome and behavioral inputs—to generate optimized meal plans and functional food recommendations tailored to individual needs.18 For instance, generative AI models (e.g., variational autoencoders combined with LLMs like GPT 3.5) have been shown to construct weekly meal plans with high macro nutrient accuracy (~84  percent) and caloric alignment (~100 percent), driven by user-specific parameters.19 Other systems, like NutriGen, enhance adherence using LLM enabled prompts and nutritional reference databases to produce context-aware, user-friendly meal strategies.20

Wearable technology—especially continuous glucose monitors (CGMs) and smart activity trackers—is being integrated into PN initiatives. CGM-connected platforms like Vively have helped users interpret glucose responses to meals, offering in-the-moment dietary feedback based on real-world glycemic behavior among thousands of users.21 Broader wearable systems track variables, such as heart rate variability, sleep and physical activity, which feed into AI models (e.g., MealMeter) to estimate meal macronutrient intake through multimodal sensing—yielding actionable insights for adjusting nutrition plans in real time.22 In clinical contexts, CGMs initially designed for diabetes care are now being evaluated for use in non-diabetic populations to guide metabolic wellness and dietary decisions, though experts caution around data interpretation and clinical relevance within healthy cohorts.23

Key Ingredients for Personalized Gut Health Support

The efficacy of probiotics hinges on strain-specific action—different strains perform unique roles in digestion, immunity, mood regulation and gut barrier integrity. For instance, Bifidobacterium bifidum MIMBb75 has demonstrated clinically significant relief of IBS (irritable bowel syndrome) symptoms and restored quality of life in randomized trials.24 Other strains, like Bifidobacterium adolescentis, produce neurotransmitters such as GABA and B vitamins, strengthening gut barrier function and reducing inflammation—benefits that vary by strain and host context.

Emerging research supports a personalized probiotic strategy, where matching strains to an individual’s gut profile (e.g., constipation vs. diarrhea, microbial diversity, metabolic phenotype) can significantly impact outcomes. One study even correlated strain-specific probiotic exposure with shifts in gut development types in preterm infants—highlighting how probiotics drive unique microbial trajectories depending on the host’s baseline state.25

Prebiotics—from inulin to galactooligosaccharides (GOS) or arabinoxylans—fuel specific beneficial microbes, supporting personalized gut health by nurturing resident bacteria aligned with an individual’s existing microbiome. By selecting fibers that promote growth of target taxa such as Bifidobacterium or Lactobacillus, personalized prebiotics can enhance short-chain fatty acid production, reinforce barrier integrity and support immune resilience tailored to unique microbial compositions.26

Postbiotics—which include microbial metabolites such as short-chain fatty acids, peptidoglycans or inactivated microbial components—offer immune-modulating and anti-inflammatory benefits, many of which may exceed those provided by live probiotics alone. These bioactives have been shown to strengthen gut barrier function, reduce pro-inflammatory markers, and support metabolic health, with early studies linking them to improvements in conditions like steatohepatitis and low-grade inflammation.27

Because individuals vary in their microbiome’s capacity to produce certain metabolites, offering specific postbiotic ingredients—or foods/formulations designed to elicit their production—allows for targeted, personalized immune support and inflammation control. These effects may be especially valuable for individuals with compromised microbiome diversity or chronic systemic stressors.

Market Trends and Consumer Demand for Personalization

Consumer interest in PN and functional foods continues to climb sharply. A 2009 survey found that consumers exhibited strong interest in genetic testing for nutrition advice and were receptive to functional foods designed based on their individual genetic profile.28

Subscription models are increasingly integrating personalized food and supplement offerings. Services like ZOE, Viome or Floré provide gut microbiome testing followed by ongoing, tailored formulations—often in subscriptions that deliver personalized probiotics, prebiotics or meal plans based on each individual’s data. This trend reflects a broader shift toward recurring, customized product delivery directly tied to personal biomarker insights and sustained consumer engagement.

In an increasingly fragmented nutrition landscape, consumers demand transparent and meaningful labeling, especially for personalized functional foods. Enhanced initiatives such as front-of-pack labeling (FOPL) have been shown to improve consumer awareness and drive healthier choices, while also encouraging reformulation by manufacturers. At the same time, frameworks for PN emphasize the importance of clear data communication and interpretability—ensuring that consumers understand how and why products were tailored to them. As markets evolve, labels that transparently communicate specific health benefits aligned with personalized needs will foster trust and credibility.

Challenges in Scaling Personalized Functional Foods

Creating truly personalized functional foods at scale introduces significant complexity. Brands must manage varied ingredient sourcing, batch formulation and logistics while ensuring consistency—often tailoring each SKU to individual health profiles. Reviews confirm that integrating multilayered omics data (microbiome, genotypes, metabolomics) into food formulation imposes high burden on R&D pipelines and manufacturing scalability.29

Collecting sensitive personal data—such as gut microbiome profiles, genetic markers, dietary history—raises substantial privacy and ethical concerns. AI-based recommender systems risk data leakage, bias and misuse if proper frameworks are not in place. Privacy-preserving techniques like data minimization and federated learning are being explored to mitigate risk, but adoption remains limited.

PN services currently fall outside explicit international regulation, putting them in a gray zone between food and wellness guidance. This ambiguity complicates claims especially related to gut health or microbiome benefits. Experts advocate for regulatory alignment across data collection, analysis, recommendation and feedback loops—while also ensuring claims are scientifically substantiated through biomarker evidence.30

Future Trends in PN Through Functional Foods

Looking ahead, the market is poised for supplements tailored to individual gut and immune profiles. Advances in computational microbiota modeling are already enabling personalized dietary interventions—for example, predicting and correcting short chain fatty acid (SCFA) imbalances in Crohn’s patients through tailored microbial therapies based on metagenomic data.31 As microbiome and metabolic profiling evolve, expect the emergence of novel supplement formats (like targeted synbiotics or engineered probiotic blends) designed specifically for personalized gut resilience and immune modulation.

The fusion of genomic and microbiome insights is refining precision nutrition. Nutrigenomics is identifying SNP-based nutrient metabolism variations—such as carotenoid processing—while microbiome data adds another layer of individual response prediction.32 Large-scale initiatives like the Integrative Human Microbiome Project (iHMP) aim to combine host genetics, microbiome, transcriptomic and metabolomic data to better understand disease states and guide personalized interventions.

Personalized functional foods are shifting toward precision health solutions—where interventions are custom-built based on multi-omic and lifestyle data. Reviews forecast that advances in omics sciences and digital health will usher in a nutritional revolution, enabling highly tailored dietary and functional food recommendations embedded into everyday life.33 AI-driven and multi-omics-integrated strategies are on the horizon to deliver more accurate, scientifically grounded nutritional interventions across health domains beyond diet alone.34

Conclusion: The Intersection of Gut Health and PN

As this evolving landscape continues to take shape, one truth stands clear: gut health lies at the heart of PN. With functional foods acting as powerful delivery systems, we’re entering a new era where dietary interventions are no longer generalized—they’re customized, targeted and scientifically informed. Whether it’s probiotics tuned to your microbiome, fibers that feed your unique flora, or postbiotics that signal immune balance, the path to precision health is being paved through the gut.

In the final installment of this series, we’ll dive into The Role of Polyphenols in Functional Foods—uncovering how these potent plant compounds interact with the microbiome to deliver targeted health benefits and shape individual outcomes. From metabolic resilience to cognitive clarity, polyphenols are set to be a cornerstone in the future of PN.

Until then, I encourage you to explore the emerging world of personalized functional foods. Learn more about your own microbiome, challenge the “one-size-fits-all” approach, and consider how tailored nutrition could be the key to optimizing your health—one bite at a time.

And be sure to follow the launch of NutriSelect.ai early next year; your portal into the next generation of truly PN. This isn’t just innovation; it’s a revolution! NIE

References:

1 https://time.com/5600706/personalized-diets-study.

2 https://arxiv.org/abs/2502.20601.

3 www.precedenceresearch.com/personalized-nutrition-market.

4 www.mdpi.com/2072-6643/17/7/1260.

5 https://pmc.ncbi.nlm.nih.gov/articles/PMC9843811.

6 www.nutraingredients.com/Article/2025/04/07/ai-personalized-nutrition-app-improves-gut-health.

7 www.tandfonline.com/doi/full/10.1080/07315724.2019.1685332.

8 www.frontiersin.org/journals/nutrition/articles/10.3389/fnut.2024.1346144.

9 www.tandfonline.com/doi/full/10.1080/10408398.2025.2461237.

10 https://pmc.ncbi.nlm.nih.gov/articles/PMC11357412.

11 https://modalityglobaladvisors.com/insights/personalized-nutrition.

12 https://pmc.ncbi.nlm.nih.gov/articles/PMC12251440/.

13 https://pmc.ncbi.nlm.nih.gov/articles/PMC12011469/.

14 https://microbialcellfactories.biomedcentral.com/articles/10.1186/s12934-022-01799-0.

15 www.scientificarchives.com/article/microencapulsation%3A-probiotics-prebiotics-and-nutraceuticals.

16 www.businessinsider.com/viome-science-technology-leaders-collaborate-ai-health-testing-2025-6.

17 www.prescouter.com/2023/06/gut-microbiome-analysis-personalized-nutrition.

18 www.frontiersin.org/journals/nutrition/articles/10.3389/fnut.2025.1636980.

19 www.nature.com/articles/s41598-024-65438.

20 https://arxiv.org/abs/2502.20601.

21 www.researchgate.net/publication/393382148_Integrating_Continuous_Glucose_Monitoring_into_Personalised_Nutrition_Retrospective_Insights_from_Real-World_Vively_Use.

22 https://pmc.ncbi.nlm.nih.gov/articles/PMC9654068.

23 https://apnews.com/article/continuous-glucose-monitor-cgm-diabetes-75469f79bc649cab0d831e6ec52758a7.

24 www.verywellhealth.com/probiotics-for-ibs-8751150.

25 www.nature.com/articles/s41564-022-01213.

26 www.frontiersin.org/journals/nutrition/articles/10.3389/fnut.2024.1355542.

27 https://pmc.ncbi.nlm.nih.gov/articles/PMC11653170.

28 https://pubmed.ncbi.nlm.nih.gov/19685435/.

29 https://microjournal.researchfloor.org/next-generation-functional-foods-bridging-gut-microbiota-modulation-and-personalized-nutrition.

30 https://www.nutraingredients-usa.com/Article/2025/01/29/the-regulatory-challenges-of-personalized-nutrition.

31 https://arxiv.org/abs/1709.06007.

32 www.frontiersin.org/journals/nutrition/articles/10.3389/fnut.2025.1553149.

33 www.mdpi.com/2072-6643/16/17/2922.

34 www.numberanalytics.com/blog/future-personalized-nutrition-advancements-functional-foods-nutraceuticals.

Dr. Bill Clark, founder and CEO of NutriSelect.ai, is a 27-year veteran of the dietary supplement industry and a recognized leader in science-driven wellness innovation. At NutriSelect, Clark is pioneering the development of Precision Supplement Intelligence, an AI-powered platform that brings transparency, scientific rigor and personalization to the $68 billion supplement market. He also leads Natprologix, a consultancy focused on product innovation and clinical research strategy. A passionate advocate for evidence-based solutions, Clark was recently named one of The Top 100 Innovators & Entrepreneurs for 2025 by Redwood Media. He is also the producer and co-host of The Bioactive Nexus podcast, a series dedicated to elevating scientific literacy and integrity within the supplement industry. For more information, email [email protected] or visit www.nutriselect.ai, www.natprologix.com, www.thebioactivenexus.com, www.drbillclark.life or www.linkedin.com/in/drbillclark. Top 100: www.thetop100magazine.com/dr-william-d-clark.