i had my best endurance sessions with eating nothing until 2 or 3 p.m. and drinking at least a gallon of water.
digestion needs energy, too. if i eat before my endurance workouts, i loose stamina. at least in my case this is completely true and i didn't read this on a blog, i feel it.
i never felt a big difference at work or lifting weights. i did most of my heavy physical jobs with only eating in the evening and never felt a difference to a normal eating pattern, except i don't like to lift stuff with a full stomach. but i am not a big guy, so carrying a lot of muscle is probably a different thing.