Yep, among Japanese, it happens all the time, but I highly doubt that anybody will say anything to your face.

I'm an American man with a 38 inch waist. My doctor says I fit the definition of obese. I have spent a total of 12 months in Japan, split among 10 long trips. I think that Japanese people are used to seeing large foreign tourists. I have never felt singled out in any way in Japan because of my weight. If anything, people have been kind, silently adjusting their chairs so I could more easily navigate the crowded breakfast room at the hotel. Japanese people are polite and want to make a good impression on foreigners. Of course, I don't understand Japanese, so if people were talking about me I wouldn't have understood it. I have never gone to any onsen, which might be a high-risk area for comments.

I have been singled out in Japan for looking vaguely middle eastern. Two photography hobbyists politely asked to photograph me. Police stopped me at the Narita airport train station and asked to see my passport. And my luggage has been subjected to special inspections twice at airports.

I am fat and was in Japan last year for 10 days and nobody said anything and there were certainly no schoolkids laughing or pointing to me.

I live here and Japanese friends will quickly make a remark if they think that I've gained or lost weight. They're very frank about it among friends/colleagues and I was put off by it at first. But I've never seen it with someone who they don't know. Japanese are very good at just ignoring those around them who they don't know.

Bargain Hunter--you really need to try an onsen. As for shaming in Onsen? Not that I have seen and I have seen guys up to Sumo size in there...

Honestly, I think in many societies worldwide, we are judged by our respective body types constantly. In Japan, it's really no better or no worse. The good thing is you know 1) they won't say anything to your face; 2) even if they do whisper something, it's not like you would understand; 3) they probably won't see you again.

Just enjoy your trip and don't worry about what others think.

I see and encounter discrimination for lots of things, but not weight. I believe Sibuayakko has a more unique insight from a local perspective, but for a tourist? Not very likely.

Japanese people are very weight conscious and talk about being overweight/underweight all the time. So naturally, people will talk about a person who's extremely big or skinny. It's just human nature, I think.

i hear Japanese people talking about a "fat American" in trains, restaurants, shops etc all the time, not to his/her face, of course. Not understanding Japanese is a blessing at times.

A couple of times an elderly person told me that I looked like I had gained weight. I was a little confused the first time, because it wasn't true. When I mentioned this to a good friend, she told me that among the war generation, it is actually a compliment because it means to them that you have enough to eat. This only happened out in the countryside, and it was always old ladies who were acquaintances. And it was in Japanese, not English, Shibuyakko, does this sound like a plausible explanation?