[Disclaimer: It is sad I need one, but obviously people can’t read. This post is a mathematical example of how practically impossible and unsafe it is to lose 10 pound of pure fat in 10 days. Please read what I wrote before leaving your comments.]
I wanted to give you some food for thought the next time you pass a newsstand and see a magazine making the claim, “Lose 10 pounds in 10 days!”
An estimated 60 to 85% of the weight of white adipose tissue consists of lipids with 90 to 99% of that being triglycerides. The remaining weight is made up of water and a slight amount of protein. The weight of one pound of stored lipids is roughly 400 grams. If we know through other calculations that fat energy is 9/kcal per gram, then it’s time to do a little math.
9 x 400 = 3,600 calories (general round figure is 3,500 calories per pound of fat)
No matter what your beliefs are regarding carbphobia to fat hate, you can’t dispute the amount of energy in stored fat. To remove that energy, you have to be in a deficit of that caloric amount (actually more) in order to remove a pound of fat. Since there is no way in ensure 100% energy consumption in fat, this would take more energy expenditure than 3,500 calories.
In order to remove 10 pounds of pure fat in 10 days, it would take an excess of 35,000 calories. To give you some perspective on the severity of that, here are a few more numbers.
Sex – Female
Weight – 155 pounds
Height – 5’5″
Activity Level (Including General Training) – 1.5
BMR + Activity – 2,300 Calories burned per day with general exercise
As you can see in this example, this female doesn’t even burn 3,500 calories per day. Even if she increased her burn to 3,500 calories, she would have to not eat at all to get close to burning one pound of fat in one day. That would mean she would have to burn over 3,500 calories per day, while not eating for 10 days. Even then, there are flaws because of metabolic adaptations and energy pathway changes.
Next time you see gimmicks and headlines on web pages or magazine stands, do a little math and have a laugh. If lost in the shuffle—this may help.