if you're going for ketosis, you shouldn't eat fruit. i should also mention that i think there's no benefit to being in ketosis, unless you've proven to yourself that it's just the only way you can eat less.
that being said, eat some damn fruit! the kind with sugar. to use as fuel. relax man, you'll still derive the bulk of your calories from fat, even if you have some blueberries. also, a protein shake is not gonna make you feel all energized.
"dean ornish and dr. davis think the palmitic acid our bodies use for fuel while we sleep is poison if we eat it. zero-carbers like charles washington think the oldest fuel in our evolutionary history – glucose - used by organisms a billion years ago and without which the brains of modern mammals cannot survive for more than a few minutes – is an unnatural toxin if you eat it. both views ignore basic facts of medical physiology and defy evolutionary history." - kurt harris