Green Tea and Walnuts: The Diet, Blood Sugar, and Brain Health Connection

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The recent study titled “Glycemic control contributes to the neuroprotective effects of Mediterranean and green-Mediterranean diets on brain age” provides compelling evidence linking dietary interventions to brain health.

Conducted as part of the DIRECT PLUS trial, the research examined how Mediterranean (MED) and green-Mediterranean (green-MED) diets rich in polyphenols and low in red meat can slow age-related brain atrophy and promote glycemic control.

Study Overview

The trial involved 294 participants aged 30 or older with abdominal obesity or dyslipidemia, primarily men (88%) with an average age of 51. Participants were randomly assigned to one of three groups for 18 months:

1. Healthy dietary guidelines (HDG): Active control group following general health recommendations.

2. Traditional MED diet: Calorie-restricted, low in simple carbohydrates, emphasizing vegetables, fish, poultry, and walnuts.

3. Green-MED diet: Further enriched with polyphenol-rich foods such as green tea (3 – 4 cups daily) and Mankai duckweed shakes (500 mL daily).

Key Findings

The study highlighted that both MED diets significantly slowed age-related hippocampal atrophy, a biomarker for brain aging and cognitive decline. Notably, the green-MED diet exhibited superior results, reducing hippocampal shrinkage by approximately 50% compared to the HDG group. This translates to a younger “brain age” compared to chronological age, as measured by the hippocampal occupancy (HOC) score.

Adopting a green-MED diet could be a practical, low-risk strategy for preserving brain health and reducing dementia risk. Key dietary recommendations include:

• Incorporating green tea (3 – 4 cups daily).

• Consuming Mankai shakes multiple times weekly.

• Increasing intake of walnuts, olive oil, leafy greens, and berries.

Conclusion

This study highlights the neuroprotective potential of MED and green-MED diets through improved glycemic control, enhanced blood circulation, and polyphenol intake. By adopting such dietary habits early in life, individuals may reduce brain aging and preserve cognitive health, offering a valuable strategy for addressing age-related neurodegeneration.

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