90% fat and 1,000 calories, ok. That's 900 calories from fat.
I guess I'd have to ask the 2 obvious questions...
1) What should the other 100 calories be? protein? carbs? mix of both?
2) What exactly do you use for fat calorie sources? I suppose a can of coconut milk that I get from WF has close to that amount, but that would get kind of boring I would think.