The myth that you can lose 54 pounds in 6 weeks - Despite what the ads say (I LOST 54 POUNDS IN 6 WEEKS WITHOUT DIETS OR EXERCISE!!! or LOSE 10 POUNDS THIS WEEKEND!), you cannot lose a pound of fat unless you burn off 3,500 calories. To lose 54 pounds in 6 weeks, you would need to lose 9 pounds in 7 days, or 1.3 pounds per day. That 1.3 pounds of fat is equal to 4,500 calories, so you would have to burn off 4,500 calories per day. The only way to do that would be to eat nothing AND run a marathon every day for 42 days. That's impossible. The only way to lose that much weight that quickly is either through dehydration or amputation. The ads are lying.