Just because your friend's dad did it doesn't mean it's easy. It's not like everyone can just spend eight hours a night walking, and it also sounds like your friend's dad ate less just because he didn't have as much time to eat what he used to eat before.
"Become a security guard" isn't sustainable advice for weight loss.
Source: I work at a healthcare company that does weight loss, among other things.
Oh wow, that's such a great idea! We never tried telling people to get their priorities straight, but now that you mention it, it seems like such an obvious way to sustained weight loss! You're a genius!
Yeah, we do, and they know. The attitude of "if they just knew they shouldn't eat, their brain wouldn't be broken any more" is tiring, and, frankly, idiotic.
Maybe pull your head out of your ass long enough to realize that nobody wants to be fat under the immense societal pressure of random assholes telling them "you're going to die", and that poor self-control is actually a physical and mental issue.
This is like a tall person telling a short person "just reach higher! Ugh!".
"Become a security guard" isn't sustainable advice for weight loss.
Source: I work at a healthcare company that does weight loss, among other things.