Hi there! Tthis is Dr. Dave Heber, Founding Director of the UCLA Center for Human Nutritionand I'm talking you today about diets that don't work. The nextone I want to talk about is the Ketone Diet or as it's known sometimes theketogenic diet. Now ketones are substances broken down from fatActually it happens while you're asleep and it happens during fasting. It's part of theadaptation to fasting. These things are soluble in your bloodstream, so they cancarry energy around your body-- unlike fats, which are not soluble andhave to be carried on proteins so these ketones go up about 300 fold over thefirst six weeks or so of starvation. And they even come out in your breathand create a fruity smell to your breath. However they have little effect onappetite. The original theory was that they would reduce hunger -- actually thatis not true. Now the other part of this is there are sticks that you can put inyour urine, which will turn blue when your ketones ar