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You see the claims all the time about losing 10 pounds or sometimes more in just three days. You just take one little pill three times a day with no dieting nor exercise and watch the pounds disappear with no work. If only it worked for good.
You can lose 10 pounds in 3 days but you will gain it all back very soon. It's hard to lose 10 pounds of fat in 365 days and many people still want to believe they can lose the same amount of weight in 1/10th the time. It's not going to work.
Unless you want to take some drastic measures that may do more harm than good.
You can lose 10 pounds in 3 days by not drinking water. You wouldn't be very healthy and probably wouldn't be able to function very well either.
The only way you'd be able to have a loss of 10 pounds of fat is if you burned an extra 35,000 calories more than you consumed over a short period of time. Each pound of fat is 3,500 calories. So ten pounds times 3,500 calories = 35,000.