12 Dec Unlocking Your Athletic Potential with Nutrigenomics: Personalized Nutrition Based on Your Genes

Unlocking Athletic Potential with Nutrigenomics: Personalized Nutrition Based on Your Genes 

We all know that our genetics can influence our health, body composition, training response, and performance potential. Traditionally, genetics was treated as an uncontrollable factor- something you simply have or don’t. But modern research shows we can leverage genetic insights to tailor nutrition and training for better outcomes. This is the realm of nutrigenomics— a science rapidly evolving with exciting evidence relevant for runners, both recreational and competitive alike

In this article, you’ll learn:

• What nutrigenomics is and why it matters for athletes
• How specific genes influence nutrient needs and response to taking different supplements
• How genetics and nutrition interact to impact performance, recovery, and body composition
• Latest research driving precision sports nutrition

What Is Nutrigenomics? Precision Nutrition Meets Genetics

Nutrigenomics and nutrigenetics explore how genetic variation affects nutritional needs and how nutrients influence gene expression. Instead of one-size-fits-all diet advice, nutrigenomics enables us to create a more personalized nutrition strategy based on your unique DNA.

Traditional nutrition guidelines are based on averages, which are useful at a population level or as a starting point, but can often miss individual differences. Genetic differences help explain why two runners following the same diet or following the same training plan may see very different results.

Understanding and incorporating genetic information into how we eat and train as runners can have massive impact on how efficiently we reach our goals.

Why Nutrigenomics Matters for Runners

Nutrigenomics can influence:

• Energy metabolism (the way our body burns calories)
• Fuel utilization (how we use different macronutrients for energy)
• Nutrient needs (how much of a vitamin or mineral you need to prevent deficiency)
• Recovery efficiency (how much muscle damage you incur with training)
• Injury risk and inflammation
• Chronic disease risk

Genetic variants interact with the foods we eat and supplements we take to influence our physiology, meaning that two athletes might need very different approaches to perform their best.

Top Gene-Nutrient Interactions All Runners Should Know About

Caffeine Metabolism: CYP1A2 & ADORA2A

Caffeine is one of the most widely used supplements in sport, but its effects on performance can vary based on genetics.

• CYP1A2 influences how fast you metabolize caffeine. Fast metabolizers may see performance benefits from caffeine- improvements in endurance, reduced pain sensation, boosted mood and motivation; on the other hand slow metabolizers may not get any benefit or can even have a worsening of performance with caffeine use before or during exercise.
• ADORA2A affects anxiety and sleep responses to caffeine. This is important for runners to understand why caffeine may make them feel jittery, or why they have trouble with sleep after having caffeine later in the day.

Bottom line: Knowing your genotype can prevent unwanted side effects with caffeine use, get the right amount at the right time for your body.

Energy Balance & Body Composition Genes

UCP1: Metabolic Rate Variability

The UCP1 gene affects resting energy expenditure, with some variants linked to slightly lower metabolism, explaining why different athletes can respond differently to the same diet or calorie amount.

FTO & Body Composition

FTO remains one of the most studied genes related to body weight and composition. It influences:

• Weight loss response related to protein intake
• Where and how we store body fat with intake of different types of dietary fats- like saturated vs unsaturated fats

TCF7L2 & Body Composition

Variants in TCF7L2 can predict how well someone responds to lower-fat diets, with some variants linked to better fat loss and others to potential muscle loss if fat is too low.

Micronutrients & Genetics: Fueling Performance and Recovery

Choline- Essential Yet Overlooked

Choline is crucial for muscle recovery after exercise, liver function, neurotransmitter production, and energy production. Some genetic variants (e.g., MTHFD1 and PEMT) significantly increase the risk of choline deficiency, especially in women. Without enough choline, runners can experience excessive muscle damage and impaired muscle recovery after exercise.

Vitamin A and BCMO1

Variations in the BCMO1 gene affect conversion of beta-carotene to active vitamin A- impacting vision, immune defense, and repair post-exercise.

Vitamin C & GSTT1

The GSTT1 gene influences vitamin C levels- those with deletion variants may require more vitamin C from fruits and vegetables. Importantly, large supplemental doses can blunt training adaptations, making a food-first strategy preferable.

Vitamin D & GC/CYP2R1

Vitamin D influences bone health, immunity, and recovery. Certain variants in CYP2R1 and GC reduce conversion or cell uptake of vitamin D- raising deficiency risk, especially in seasonal climates where there is less sun exposure year-round.

Iron Metabolism Genes (TMPRSS6, TFR2, TF)

Several genes regulate iron absorption, transport, and use. Athletes with high-risk variants need careful monitoring as low iron can severely impact endurance and immune system function. Pairing iron with vitamin C enhances uptake, which is especially important for plant-based athletes.

Vitamin B12 & FUT2

Variants in FUT2 affect B12 absorption and may increase risk of deficiency, especially in athletes on plant-based or vegan diets. Supplements taken on an empty stomach can improve uptake.

Can Nutrigenomics Predict Athletic Performance?

Genetics alone can’t predict who will be an elite athlete, but it can indicate relative strengths and weaknesses in traits such as:

• Endurance adaptations
• Strength and power responses
• Recovery capacity

For example, genes like ACTN3 can tell us how well someone builds fast-twitch muscle fibres in response to strength training. Understanding these genetic differences can help athletes tailor their training priorities and schedule workouts in a way that gets them the best results possible.

Real-World Application: What You Can Do Today

1. Get your own nutrigenomics test done that is focused on genetic markers related to nutrition and fitness, and work with a Registered Dietitian who can interpret your results and create a personalized strategy for you based on your goals, needs, and genes. You can get yours done with me through my 1:1 coaching programs. Learn more and apply here!
2. Use your genetic results to tailor macronutrient ratios, supplement strategies, training and recovery protocols.
   Monitor blood biomarkers regularly (iron, vitamin D, B12, etc)
3. Pair your genetic insights with your training data and daily food intake to make adjustments and optimize your results in real time.

Conclusion

Nutrigenomics can transform how you approach your nutrition and training as a runner- moving from broad recommendations to scientifically personalized strategies. While genetics is not destiny, it provides powerful insights for optimizing fueling, recovery, and adaptation to training loads. Combined with emerging research in microbiomics and multi-omics, the future of sports nutrition is personalized like never before.

Ready to find your best diet and training plan based on your genetics? Learn more about nutrigenomic testing and how it can help you optimize performance inside my 1:1 coaching programs!