Keeping our thinking clear, memories vivid, and mind sharp matters at every stage of life — and there’s more we can do than you might think. The Healthy recently highlighted fresh international research showing that a few smart food choices can make a real difference for brain health, including a beloved hot drink.
Taking the Mediterranean Diet to the Next Level: The Green-Mediterranean Twist
The Mediterranean diet has long been celebrated for heart health, longevity, and balanced weight. Now, Harvard researchers provide compelling evidence that it benefits the brain too — especially when you add a little "green" boost.
Published in Clinical Nutrition this October, the study introduces the "green-Mediterranean diet," which builds on the classic Mediterranean foundation with three powerful extras:
- green tea (3–4 cups daily),
- walnuts (about 28 grams daily, roughly 7 halves),
- and Mankai — a nutrient-rich aquatic plant popular in Southeast Asia.
Surprising Findings from the Study
Researchers from Harvard T.H. Chan School of Public Health, Ben-Gurion University in Israel, and Leipzig University studied about 300 participants. They drew data from a long-term brain research program exploring links between diet and brain changes.
Participants were divided into three groups:
- those following a generally healthy diet,
- those on a traditional calorie-restricted Mediterranean diet,
- and those following the green-Mediterranean diet.
Using MRI scans, the team mapped brain aging and measured blood levels of two proteins — Galectin-9 (Gal-9) and Decorin (DCN) — linked to faster brain aging. Those on the green-Mediterranean diet had lower levels of these proteins, suggesting the diet’s anti-inflammatory effects protect the brain.
Expert Insight: Nutrition Shapes the Brain’s Future
“This research offers dynamic insight into brain health, letting us spot biological changes well before symptoms appear,” said Anat Meir, PhD, MPH, postdoctoral researcher at Harvard and co-author of the study.
“Mapping protein signals gives us powerful clues on how interventions like nutrition can help preserve cognitive function as we age.”
What Is Mankai and How to Include It in Your Diet?
Mankai is a type of duckweed, one of the world’s smallest flowering plants. It’s packed with protein, iron, vitamin B12, and antioxidants. Though not yet widespread in Hungary, you can find it as a supplement or frozen powder in some organic stores and online. If you can’t get Mankai, other green superfoods like spirulina or chlorella are great antioxidant-rich alternatives.
Green Tea Is More Than a Trend
Green tea has made a comeback for good reason: it’s rich in flavonoids and polyphenols that may help reduce inflammation and protect nerve cells. Drinking 3–4 cups daily can have a noticeable impact on brain health.
Tip: Choose Japanese green teas like sencha or matcha for their especially high active compounds.
Brain Health Is More Than Just Nutrition
While diet plays a big role in brain function, experts highlight other lifestyle habits that work together for full protection, according to the U.S. National Institutes of Health (NIH):
- regular exercise (at least 150 minutes of moderate activity weekly),
- quality sleep (7–8 hours per night),
- stress management and mental health support,
- mental challenges (like learning, reading, games),
- and nurturing social connections.
Start Small and Build Up
You don’t have to overhaul your diet overnight — even one cup of green tea, a few walnuts, or a green smoothie daily can spark positive change. Being mindful of what you eat and how you live can pay off with a sharper brain for years to come.
