Whiskey (Canadian), red wine, and cigarettes. All in copious quantities. After all, it's always 5 o'clock somewhere.
I supplement these essential nutrients -- in themselves of course perfectly capable of sustaining human life -- with red meat, preferrably cooked over a high heat w/butter (no olive oil), accompanied by bread. For breakfast? Fried eggs, bacon, and toast w/drippings.
I find that this regimen plugs energy leaks, improves power transfer when cycling, and contributes greatly to an overall excellent quality of life.