You know, you are going to die. They're going to lower you into a hole in the ground. The worms will have you for dinner. That's it.
Right before you die, are you going to say to yourself, "boy, I'm sure glad I made sure to have a balanced diet with good nutrition" ? Will you say, "I'm glad I didn't enjoy cheese and bread with butter every single day" ?
70 years of pure joy, of every moment counting, of getting just what you want, is worth a million years of trying to extend your life and health. Don't live the life you think you're supposed to, and don't live for the future. Whatever you like, do it now.