False. The eight pounds is not fat. Often diets promote rapid weight loss, with marketing slogans like “lose 10 pounds in 2 weeks”, or “I lost eight pounds the first week I was on the _____ diet”. Note that the ad states the weight loss and not fat loss. Rapid weight loss is neither healthy nor safe and does not usually result in large amounts of fat loss. In fact, losing eight to ten pounds of fat in a week would be nearly impossible. The weight lost during crash diets and low carb diets can be attributed to the depletion of muscle glycogen, relative dehydration, and the breakdown of protein in muscle (muscle loss) and liver. *

*from “Fitness or Fiction” by Brent Brookbush