I can still do it when I hunker down and legitimately try, but you need to drown out distractions. I don't know how old you are, but graduating high school in t

I can still do it when I hunker down and legitimately try, but you need to drown out distractions. I don't know how old you are, but graduating high school in the 90s, the Internet existed when I was in college, but no social networks, no targeted advertising, no attention economy, no smart phones. I didn't have a dumb mobile phone or even a television. If I want to learn as much as I learned back then, I need to remove those things from my life as much as possible. Leave the phone in my bedroom. Read physical textbooks and take notes by hand on paper, not on an electronic device connected to the web. If I'm reading papers/articles, print them out. This is effectively isomorphic to the obesity epidemic. You can try to white knuckle it with sheer discipline or run 80 miles a week, and some people manage to do that, but mostly it's a matter of food environment. If you have a genetic predisposition to frequent snacking, typically the only way to avoid it in the long run is to not have shitty snack foods available to you at all. Expecting to just control yourself when the option is there not to usually doesn't work at some point. You can't binge on screen time if you have no screens around.