[Punkin]

I was just wondering if someone could explain something to me which has been mentioned on several threads. What does it mean when someone says they are knocked out of ketosis after eating something. I am assuming that when you eat a meal of food there is a rise in insulin because your body is receiving food, and the insulin's job is encourage uptake of those nutrients by body cells. So would it not make sense that ketosis would stop temporarily after a meal?