Most people here in Japan (Osaka) are indeed thin, or rather, a healthy weight, but I'm not so sure I'd call most healthy looking. A startling number of people seem to have various skin conditions here... I can't help but think it might be related to carb overload as well as the fact that damn near everything has "salad oil" in it (usually soy bean oil... but non GMO as if that made much difference). The Japanese may have had one of the longer life expectancies, but with all the absolute garbage the postwar generation is eating these days that will likely soon change.
Some typical breakfasts:
a slice or two of cloyingly sweet thick cut white bread with jam or honey, juice, maybe some yogurt
a bowl of rice with some sort of sprinkled topping (maybe natto, maybe dried fish, maybe dried salty shiso), juice / tea, and possibly soup
For lunch and dinner, if rice is served, it is considered the meal and everything else the accompaniment. And, if there's no rice for some reason, you can bet that there will be some noodle of some form.
The Japanese aren't fat in general, so perhaps rice at least can't be directly implicated as a cause of obesity. However, I'd be reluctant to call the majority of modern day Japanese adults "healthy". Doubly, nay, triply so for the work-a-day men here... admittedly it's a bit of a stereotype, but all too true at the same time: smoking, drinking, not sleeping, working 10+ hour days 6 days a week, no exercise, and a diet of, while perhaps not fattening, nutritionally dead white rice can't be good for one's well being.
Do the Japanese in general eat "better" than many western nations? Yes, especially the older generations. Are the Japanese the model of perfect health and longevity that CW would have people believe? Not unless your only metric for healthy is "not fat".
End mini-rant Japan is a fantastic place to live if you can escape corporate servitude somehow, but there are also an unending number of rant worthy topics -- change is a four letter word here