@chranokil
This is the source I'm using for the average weight
https://livejapan.com/en/in-tokyo/in-pref-tokyo/in-shinjuku/article-a0000962/#:~:text=The%20average%20height%20of%2017,height%20is%20still%20relatively%20tall!
And these are the results I got
You'd be dead after 20 shots of tequila or at least in the hospital for alcohol poisoning.
edit- I just did the math. Based on the average weight of Japanese men and women and saying that it's been 3 hours since their first drink, his BAC would be 0.71% and hers would be 1.0%. At 0.4% BAC is...
It's gonna be way harder for him to gain muscle now that he's skinny. If his end goal is to get ripped he should've been doing weight training to sculpt that fat into muscle, not cardio. Now he will need to eat way more to build mass.