it reminds me of a topic shown that Japan has a mandatory medical examination and the weight is also closely watched.
and the docs will give some warning or notice to the patient that's already beginning to go over the normal average weight.
That's... not really a Japanese thing. I certainly get weighed every time I get my yearly physical. Though I've never gotten any warning seeing as I've been 195cm and about 77-79 kilos since I was like seventeen.