I have wondered about this in tavern and drinking shows on variety shows featuring celebrities.
There are individual differences in the amount of alcohol one can drink depending on one's constitution and whether one's face turns red or not.
When going out for a drink with acquaintances, some people are strong drinkers and drink a lot without changing their complexion at all, while others are weak drinkers and only drink a small amount, with their faces turning red after one beer.
However, when celebrities drink alcohol at izakaya (Japanese-style pubs) or in the studio in TV variety shows, many of them do not turn red in the face, which is strange.
In a previous variety show, Mai Shiraishi drank two beers and one cup of sake, but her face did not turn red and she did not look drunk.
Rina Ikoma also drank a couple of glasses of plum wine on the previous program, but her face did not turn red at all.
Model Saeko also drank three glasses of beer in a variety izakaya show, but her face did not turn red and her complexion did not change at all.
Model Ono no Ono also drank more than 10 glasses of beer and sake in a variety show on location at an izakaya (Japanese-style pub), but her complexion did not change at all.
SMAP's Nakai, Katori, and Tamori also drank alcohol on TV programs, but their faces did not turn red.