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Study decoded · nutrition · Emerging
Higher Dietary Antioxidant Scores Linked To Fewer Deaths In Stroke Survivors
1,376 stroke survivors86.4-month follow-up44% lower death riskNHANES data
A study published in Nutrition Journal found that stroke survivors with the highest dietary antioxidant scores had a 44% lower risk of death from any cause compared to those with the lowest scores.
Researchers analyzed data from 1,376 stroke survivors in the National Health and Nutrition Examination Survey, collected between 1999 and 2018, and followed them for a mean of 86.4 months using death records from the National Death Index. Of this group, 587 participants died during follow-up. Each one-unit rise in the composite dietary antioxidant index, a combined score built from intake of vitamins A, C and E, zinc, selenium and carotenoids, was linked to a 6% lower risk of death from any cause (HR 0.94) and a 9% lower risk of cardiovascular death (HR 0.91). Comparing people in the lowest fourth of scores to those in the highest fourth, the high-scoring group had a 44% lower risk of all-cause death (HR 0.56) and a 62% lower risk of cardiovascular death (HR 0.38).
The authors describe the composite dietary antioxidant index as a way to capture overall antioxidant capacity from food rather than any single nutrient. Antioxidants neutralize unstable molecules called free radicals that accumulate after a stroke and contribute to ongoing cell damage and inflammation in blood vessels. A diet supplying more of these nutrients together, the authors suggest, may blunt that damage more effectively than any one vitamin alone.
Death Risk Drop, Highest vs Lowest Antioxidant Diet Quartile
Data Panel
- Who
- 1,376 stroke survivors from NHANES, 1999 to 2018
- Design
- Observational cohort study using Cox regression, restricted cubic splines, Kaplan-Meier analysis and subgroup evaluation, mean follow-up 86.4 months
- Dose
- Composite dietary antioxidant index calculated from vitamin A, C, E, zinc, selenium and carotenoid intake via dietary recall
- Primary result
- Highest vs lowest quartile: 44% lower all-cause mortality risk (HR 0.56, 95% CI 0.41-0.76), a signed change of -44 percent; per one-unit increase: 6% lower all-cause mortality risk (HR 0.94, 95% CI 0.91-0.98)
- Secondary
- Cardiovascular mortality: 62% lower risk in highest vs lowest quartile (HR 0.38, 95% CI 0.21-0.70), a signed change of -62 percent; per one-unit increase, 9% lower cardiovascular mortality risk (HR 0.91, 95% CI 0.86-0.97)
- Funding / conflicts
- Not reported
This is an observational study built on dietary recall data, which relies on self-reported eating habits and captures only a snapshot of intake rather than lifetime diet patterns. The design shows a link between higher antioxidant scores and lower death rates in stroke survivors, not proof that eating more antioxidant-rich food causes people to live longer. Funding and conflicts of interest were not reported in the abstract.
Dr. Axe's Take
This lines up with what I'd expect in stroke recovery: real oxidative damage is happening in brain and blood vessel tissue, and a diet loaded with antioxidant-rich foods tracks with meaningfully lower death rates here. I would not wait on more trials to act on this. Build meals around colorful vegetables, berries, nuts and seeds for vitamin E and selenium, and citrus or bell peppers for vitamin C, every day after a stroke diagnosis. Pair that with prescribed medical care, never as a replacement for it. I would also cut processed food and seed oils, since they drive the oxidative stress this index is designed to counter.
— Dr. Axe