Stomack should be 80%

In Japan, there is a word, Hara(stomach) Hachibunme(80%). I hear that this is a word in a book written in the Edo period. When you eat, you shoud not eat until you get full, you should stop at about 80%. By doing so, it seems that you can maintain good health. The average life span of Japanese people is known to be long. I introduced Japanese saying.
Can you tolerate 80%?