Ahhh, I think I understand. At the times I smelled "ammonia" I was on a 1200 calorie diet. The article states, "Furthermore, fats can only be metabolized when there is a certain amount of glucose present to produce oxaloacetate that condenses with acetyl CoA in the citric acid cycle." If I'm understanding this correctly this means when there isn't enough glucose present to metabolize fat that's when you run into problems.

Thanks Zen.