Eating is mostly at specified times

In Japan, it is quite rare to see someone eating a burger or burrito as they walk in the street. Mealtimes are sacred in Japan and are treated as such; no TV, no work, or movement while eating. Although you are allowed to eat whenever you want, eating on the go is considered impolite in Japan. This helps them avoid overeating which helps them remain slim.

Healthy cooking methods

Japanese food involves a whole lot of boiling, steaming, stir-frying, pan-grilling, slow-cooking and fermenting. Raw, simmered, steamed, and grilled techniques are more preferred because they help avoid the excessive use of oil which promotes weight gain. In addition to helping avoid weight gain, these cooking methods also preserve the taste and nutrients in the ingredients. Deep-fried foods, such as tempura, are rare but when served, there are usually other accompaniments to balance the meal.