> 移り箸 Utsuribashi (also known as 渡り箸 wataribashi)
> To keep putting the chopsticks into the same side dishes. It is proper etiquette to first eat rice, move on to eat from a side dish, eat rice again, and then eat from a different side dish.
So keto itself is a faux pas?
> 返し箸 Kaeshibashi (also known as 逆さ箸 sakasabashi)
> To turn the chopsticks around when serving food so that the tips of the chopsticks that have touched one’s mouth do not touch the food.
Ewww. I’d rather be rude than share germs.
You will quickly learn the first one because if you keep eating the delicious side dishes you will be only left with large amounts of bland rice to eat last.
Keto diet doesn’t exist in Japanese cuisine. If you’re going to a keto friendly place, it’s something trendy and contemporary so this traditional advice obviously doesn’t apply. It is not a faux-pas to eat non traditional / non Japanese cuisine.
>> To turn the chopsticks around when serving food so that the tips of the chopsticks that have touched one’s mouth do not touch the food.
> Ewww. I’d rather be rude than share germs.
I think this means you should use something other than your chopsticks to share food, and not just assume that "the back of my chopsticks are germ-free, I'll use that"