Traditionally, the Japanese tend to have a healthy attitude to food and eating. They have a saying, “hara hachi bu”, which means to eat until you are 80% full, and it's not uncommon to teach children this philosophy from a young age. The way the Japanese serve their food is also key.

The Japanese tendency to eat less is rooted in a cultural philosophy known as "Hara Hachi Bu," which instructs individuals to eat only until they are 80% full. This practice, combined with a diet that emphasizes small, varied portions (Ichigyu Sansai), naturally prevents overeating. In 2026, Japanese cuisine continues to focus on high-protein seafood, fermented foods, and nutrient-dense vegetables rather than high-calorie, "fat-heavy" sauces or large servings of red meat. Additionally, the high fiber content in their traditional diet promotes satiety faster. Societal norms also play a role; there is a strong cultural emphasis on maintaining a healthy weight, and school lunches are designed to teach children early on how to balance nutrition and portion control, leading to a population that is more "attuned" to their actual hunger cues than many Western cultures.