A
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HRV is a good overall marker of how your autonomic nervous system is handling total stress, but it cannot cleanly isolate the effect of nutrition from other factors like sleep, training load, or illness.
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Diet still matters: chronically poor nutrition (excess calories, ultra-processed foods, high sugar/unhealthy fats, low micronutrients) tends to worsen metabolic health and inflammation over time, which often shows up as more day‑to‑day HRV instability or a slow downward drift.
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Supportive nutrition (adequate calories, balanced macros, micronutrient‑dense whole foods) is usually reflected in more stable HRV trends, with fewer big dips rather than dramatically higher numbers.
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Very low energy availability or aggressive calorie restriction can paradoxically raise HRV while the body is in “energy‑saving” mode, so a higher HRV is not automatically a sign of better health.
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Seasonal factors (light, temperature, routines, social patterns) can cause large HRV shifts on their own, so single short‑term changes after tweaking diet should be interpreted cautiously against longer‑term baselines.
- https://pmc.ncbi.nlm.nih.gov/articles/PMC5882295/
- https://web.fibion.com/articles/hrv-nutrition/
- https://kclpure.kcl.ac.uk/portal/en/studentTheses/investigation-into-the-dietary-determinants-of-heart-rate-variabi
- https://www.frontiersin.org/journals/neuroscience/articles/10.3389/fnins.2025.1654796/full
- https://pmc.ncbi.nlm.nih.gov/articles/PMC3403707/
- https://www.sciencedirect.com/science/article/pii/S216183132200285X
- https://zoe.com/learn/heart-rate-variability-diet
- https://faseb.onlinelibrary.wiley.com/doi/abs/10.1096/fasebj.30.1_supplement.754.2
- https://www.healthspanelite.co.uk/knowledge-hub/training-advice/what-is-heart-rate-variability/
- https://elitehrv.com/case-study-the-effects-of-diet-on-heart-rate-variability
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