Ketoacidosis is not something non-diabetics need to worry about. As far as I can understand (and I'm no biochemist or nutritionist), ketoacidosis is a sort of uncontrolled ketosis (which is a normal process) caused by the absence of insulin. In the absence of insulin, glucagon, which 'balances' the effects of insulin, converts dietary fat to ketones and also releases fat from fat cells to be burned for energy as ketones; but without the balancing effect of insulin, TOO MUCH fat is released all at once. And without insulin, the bloodstream is also flooded with sugar, which needs insulin to metabolize it properly.

Non-diabetics have insulin to balance out our glucagon, so we don't go into ketoacidosis.

This is probably a very poor explanation! I culled it from pp. 34-38 of Protein Power, but I can't claim to either understand it or explain it very well. However, I believe this is the general idea.

Hope this helps!

Rachel