I was reading about Okinawa the other day—those islands south of mainland Japan where people routinely live past 100—and kept seeing the same phrase pop up. “Hara hachi bu.” Stomach eight parts full. Eat until you’re 80% full, then stop. It’s not about leaving food behind or wasting anything. Japanese culture values “mottainai” too deeply for that. Hara Hachi Bu is about knowing when to stop before you hit that stuffed, sluggish feeling. You serve appropriate portions, eat slowly and mindfully, and recognize the moment when you’re satisfied but not heavy. The brain takes 20 minutes to register fullness, so stopping at 80% means you end up perfectly content—not hungry,…