Japanese breakfasts are mostly miso soup or fish, which is rich in protein, so it won't make people feel hungry too early and reduce their desire to eat snacks.
Japanese-style dinner is mainly vegetables, which is relatively light, and pursues the original flavor of food with less oil and less stew. Because light food will not cause great stimulation to people's taste and will not cause any harm to the gastric mucosa, Japanese cuisine follows this principle.
Japan is very strict about ingredients and management, and strictly follows the principle of food freshness from materials, production and storage. Japanese food has no habit of staying overnight. Cooking and eating on the same day are very beneficial to people's health.
Traveling in Japan is mainly by subway or bike. The number of people taking the subway in Japan is very large, and it is often very crowded. To take the subway, you have to run into the station, squeeze into the carriage, and learn to stand in balance on the bus, which inadvertently consumes your ability; Cycling is an effective activity to burn body fat.
Good eating habits, coupled with proper exercise, are the main reasons why Japanese people pay attention to diet without getting fat.