千金难买老来瘦

千金难买老来瘦

Literally means:

it is invaluable to remain slim at one's old age

Actually means:

It is better for old people to be little slim, because remaining slim at an old age is rather difficult; it may cost more than a thousand pieces of gold.

This phrase is often used to remind people that obesity may cause various diseases, and old people must try not to be too fat. Commendatory

老年人瘦一点有利于健康，因为人到老了减肥瘦身很不容易，简直是千金难求的事情。

常用来告诚人们，肥胖会引起各种疾病，因此人老了要避免发胖。具有褒义色彩。