I found some interesting information in Dr. Joel Fuhrman's book Eat To Live (to be reviewed in the February issued of Life-Style). If that name sounds familiar, you might recognize it from his lecture on PBS. Here is an excerpt from the book:
"Fat, such as olive oil, can be stored on your body within minutes, without costing the body any caloric price; it is just packed away (unchanged) on your hips and waist. If we biopsied your waist fat and looked at it under an electron microscope, we could actually see where the fat came from. It is stored there as pig fat, dairy fat, and olive oil fat - just as it was in the original food. It goes from your lips right to your hips. Actually, more fat from your last meal is deposited around your waist than on your hips, for both men and women. Analyzing these body-fat deposits is an accurate way for research scientists to discern food intake over time. Having research subjects remember what they ate (dietary recall analysis) is not as accurate as a tissue biopsy, which reports exactly what was eaten."
Wow! No point lying to Dr. Fuhrman. He knows what you did!
Seriously, this is an interesting book for many reasons. Be sure to read my review in the February issue of Life-Style.