Overview

Blueberries are rich in polyphenols, particularly anthocyanins, which give them their dark blue colour and many of their health effects. They are among the most studied berries in nutrition science, with human trials examining their effects on cognition, vascular function, and metabolic health.

In a longevity context, blueberries are especially relevant because they appear to support brain health, endothelial function, and insulin sensitivity.

Exceptional Bioactive Compounds

Blueberries are one of the richest dietary sources of anthocyanins, a class of flavonoids with antioxidant and anti-inflammatory properties.

They also provide: - Polyphenols - Vitamin C - Fibre

These compounds may help reduce oxidative stress, improve vascular function, and support healthy ageing.

Why We Include It

1. Cognitive support Human trials suggest blueberry intake can improve memory and some aspects of cognitive performance in older adults.

2. Vascular function Controlled trials show improvements in endothelial function, an important marker of cardiovascular health.

3. Insulin sensitivity Blueberry bioactives have improved insulin sensitivity in adults with obesity and insulin resistance.

4. Polyphenol diversity Blueberries add a highly studied anthocyanin source to a plant-diverse formulation.

Key Nutrients & Compounds

- Anthocyanins - Polyphenols - Vitamin C - Fibre

Evidence & References

Study 1 — Memory in Older Adults

Type: Human intervention trial Population: Older adults with early memory changes Intervention: Wild blueberry juice daily Duration: 12 weeks

Key Finding: Blueberry supplementation improved paired associate learning and word list recall.

Why it matters: Cognitive resilience is a key part of healthy ageing and longevity.

Source: https://pubmed.ncbi.nlm.nih.gov/20047325/ Study 2 — Endothelial Function in Metabolic Syndrome

Type: Randomised, double-blind, placebo-controlled trial Population: Adults with metabolic syndrome Intervention: Blueberries daily Duration: 6 weeks

Key Finding: Blueberry intake improved endothelial function, although it did not significantly change blood pressure.

Why it matters: Endothelial function is an important marker of vascular health and future cardiovascular risk.

Source: https://pubmed.ncbi.nlm.nih.gov/26024297/ Study 3 — Insulin Sensitivity

Type: Double-blind, randomised, placebo-controlled clinical trial Population: Obese, nondiabetic, insulin-resistant adults Intervention: Blueberry bioactives Duration: 6 weeks

Key Finding: Blueberry supplementation improved whole-body insulin sensitivity.

Why it matters: Better insulin sensitivity supports metabolic health and may reduce long-term disease risk.

Source: https://pubmed.ncbi.nlm.nih.gov/20724487/ Supporting Evidence — Longer-Term Cardiometabolic Function

Type: Randomised controlled trial Population: Adults with metabolic syndrome Intervention: Blueberry intake Duration: 6 months

Key Finding: In the longest-duration RCT to date, daily blueberry intake improved biomarkers of cardiometabolic function, including vascular function, in adults with metabolic syndrome.

Why it matters: This suggests benefits may extend beyond short-term changes and support longer-term cardiovascular health.

Source: https://pubmed.ncbi.nlm.nih.gov/31136659/ Supporting Evidence — Cognitive Function Review

Type: Systematic review

Key Finding: Across intervention studies, blueberry consumption was associated with improvements in several measures of cognitive performance, particularly memory-related outcomes.

Why it matters: Reviews help show whether benefits seen in individual trials are part of a broader pattern.

Source: https://pubmed.ncbi.nlm.nih.gov/30999017/ Accessible Overview: https://www.healthline.com/nutrition/foods/blueberries

Summary

Blueberries are one of the most evidence-backed fruits for healthy ageing, with human studies supporting their role in cognitive function, vascular health, and insulin sensitivity.