You can get burnt out while not neglecting any of those things. Going to bed at 10pm with fresh sheets after a nice healthy dinner with friends is not able to offset an unlimited amount of workplace stress, although it's surprisingly effective.
Once you're in a slump you'll probably start neglecting things, but that's getting the causation the wrong way around.
Once you're in a slump you'll probably start neglecting things, but that's getting the causation the wrong way around.