Japanese Nutritionist Reveals Daily Food Loved by Healthy 90-Year-Olds

A leading nutritionist from Japan has revealed the one food she eats every day—a simple, traditional staple also beloved by the remarkably healthy 90-year-olds in her life.

Dr. Yuko Tanaka, a Tokyo-based nutrition expert with over two decades of experience in aging and diet, says the food is fermented miso, often enjoyed as part of daily meals in Japanese households.

“Almost every healthy older adult I know, including my 93-year-old grandmother, has eaten miso soup nearly every day of their life,” Dr. Tanaka shared in a recent interview. “It’s comforting, nourishing, and excellent for digestion.”

What Makes Miso Special?

Miso, a fermented soybean paste, is rich in:

• Probiotics that support gut health
• Essential amino acids
• Vitamins B, K, and E
• Antioxidants that combat inflammation

The dish is typically consumed as a broth with seaweed, tofu, and green onions, and often served with rice and fish — a balanced and nutrient-dense combination that supports long-term health.

“Fermented foods like miso contribute to a diverse gut microbiome, which is linked to better immunity, mood, and aging,” Dr. Tanaka explained.

A Lesson from Japan’s Longevity

Japan has one of the highest life expectancies in the world, and the island of Okinawa is globally recognized as a “Blue Zone,” where residents often live well into their 90s and 100s. A common trait among them? A traditional, mostly plant-based diet with minimal processed foods.

Dr. Tanaka recommends that people around the world consider incorporating small servings of fermented foods daily — whether it’s miso, kimchi, yogurt, or kefir — to support their health naturally.

“It’s not just about living long — it’s about living well,” she added. “And in Japan, miso is part of that secret.”