I see a flaw in this logic. One certain bad thing that will happen to you if you leave every day as if it is your last is that you'll end up being > 200 kg (would you go to the gym the last day of your life? Would you resist the urge to eat as much as you like?). Another is that you will stop learning anything (would you go to your french course in your last day?) Another is that you might become a drug addict (some people might decide to see how crack feels like in their last day, something they wouldn't do otherwise). Another is ... ok, I believe you get the point.
The flaw in your logic is that it focuses only on instinctual pleasure and not that of a higher nature. For every "would you...?" that you propose, there is a large group of people who would say, "yes".
The trick to happiness is not always to change what you're doing; it is often to change your thinking about what you're doing. To be conscious enough of yourself to know when you are full and when you are eating food that will make you feel shitty later. To feel the pleasurable burning of your muscles and your mind as you work out and learn new things. To avoid doing anything that will later rob the little time that you have.
I don't claim to be able to do all of this myself, but I have resolved to try to stay focused on these things. There is much beauty in the world, much to experience, without changing anything but your mind.
You missed my point completely. YES. With the right mindset, there is pleasure in exercise and learning, you realize that gorging yourself will make you feel like crap later, and with only a day left, I would hardly want to waste it out of my mind on drugs.
