Japanese people are healthy and live long because of their diet. Their diet is mainly based on fish, vegetables and fruit. Japanese people eat slowly and mindfully.
The average Japanese person eats about 25% fewer calories per day than the average American, partly explaining their lengthy lifespan. Fruits, vegetables, and broth-based soups (which are all part of the Japanese diet) are less energy-dense foods than, say chocolate and cookies. Fish are a good source of omega-3 fatty acids that are known for their health benefits. Japanese eat less red meat, which if eaten excessively, can lead to obesity and heart disease.
Food is also served in smaller portions, which may be a secret to eating healthier and losing weight.