Ikigai talks about world’s blue zones, where people live longer and have fewer diseases than anywhere else in the world. Places like Okinawa, Japan or Sardinia, Italy. Scientists interview centurians that live in these regions and try to find insights about longevity. Some of the recommendations are:

• Fill your belly to 80%, stop eating before you’re full
• Eat a wide variey of vegatables every day
• Grains are the foundation of their diet, they rarely eat sugar.
• Drink green tea, rich in antioxidants
• Stay active, do lightweight exercise

Overall, the book isn’t very coherent, and talks about many different subjects and doesn’t have a single hypothesis.