Yes, this is what it takes, unless you are taking just loads of steroids.
I think most men know that, but very few women. In fact, most women know far less about men and their experiences than they think they do.
Anyway, one of the best illustrations I’ve seen of that is not with a man, but Rhonda Rousey at her weigh-in vs. her fight weight. Note that these photos were taken only about 24 hours apart:
Why the huge difference? Mostly dehydration. To get in a lower weight class, she would’ve been actively purging water, not drinking, and using other techniques to drop weight. That’s about a 15-20 pound weight difference there in a single day.
Nearly any male actors you see in movies/shows also do this if they have any shirtless scenes.