This video doesn't say HOW he lost the weight, it just shows him doing some exercises and some walking.  It says nothing at all about what foods he did or didn't consume, nothing about water ingestion, nothing about how long he did this every day . . . it's rather a bare bones vid.  But I would imagine if anyone wants the rest of his story, it MIGHT be on the internet somewhere, but I'd look it up fast because the "censors" seem to be removing this sort of thing from places like youtube.  I have no idea why they would remove something like this, but nothing positive is welcomed anymore in our overly PC society.

https://biggeekdad.com/2019/01/incredible-365-day-transformation/