People in Japan are generally thin and fit compared to other western and industrial nations, especially compared to the USA. But if you are some kind of doest like
- Low Carb Diet
- Low Sodium Diet
- Gluten Free Diet
- Vegetarian Diet
- Kosher Diet
- Halal Diet
Thing get really complicated. Most meals (dining out) in Japan are very balanced but they do not make much changes. What I mean is that restaurants do not usually accept any dietary requests.