Photo: Brett Jordan

Is it possible to lose 20 pounds in 2 days?

The verdict: fast weight loss is a myth…if your goal is fat loss. It is not physically possible to lose 11 pounds of body fat in 2 days. Even ten days would be pushing the limits of what is possible. Fast weight loss almost always comes down to fluctuations in cellular water.

kellybailey.fit - Lose 11 pounds in 2 days? The Myth of Fast Weight Loss

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The myth of fast weight loss: the numbers tell the truth

First we need to explore three scientifically accepted numbers related to metabolism, calories, and exercise. These numbers represent averages and are what we will use in our math equation to debunk the myth of fast weight loss. The average woman (5’ 5” tall and 150 lbs.) burns about 2,000 calories per day. Depending on your height, muscular build, age, and activity level, you may burn more or less than this, but 2,000 is the generally accepted average. It is also generally accepted that there are 3,500 calories in one pound of fat. To lose one pound of FAT, you must burn 3,500 calories. Or to gain one pound of fat you need to eat 3,500 calories in excess of what your body needs. The average woman burns about 500 calories per hour while running at 6 miles per hour on a treadmill. Again, your calorie burn during exercise is dependent on many factors, but 500 to 600 calories per hour is a generally accepted average for running/jogging.

Got all that?

The myth of fast weight loss: Can I lose 11 pounds of FAT in 2 days?

If there are roughly 3,500 calories in one pound of fat, to lose 11 pounds of body fat you’d need to burn about 38,500 calories…and you’d need to do that in 48 hours to meet the diet claim. Since we know the average woman burns about 2,000 calories per day, even if she does not eat anything for 48 hours, her total calorie deficit will only be 4,000. There are 3,500 calories in one pound of fat. That means she lost just a smidge over one pound of body fat by eating nothing for two days. Ugh.

Let me say that again for those in the back: after not eating for two days, she’s only lost one pound. Now she needs to make up the difference with exercise. To lose another 10 pounds of fat in 48 hours, she has to burn about 34,500 more calories. So how much exercise would she need to do?

Remember that our average woman needs to run for 60 minutes to burn about 500 calories.

How does the math work out?

To lose 11 pounds of FAT in two days, she has to eat nothing and she has run at 6 mph on a treadmill for nearly 70 hours. Hmmm. I’m no math genius, but 70 hours is longer than 48. Someone didn’t do their math correctly…and it wasn’t me! Math aside, let’s also make note that anyone but an ultra-marathoner probably can’t run for 70 hours. I mean, would you even want to? Yuck. I’ll keep my 11 extra pounds of fat, thank you.

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scripps.org - How to Get the Most Out of Your Juice Cleanse Diet

Juice cleansing sounds like a healthy, natural way to get plenty of fruits and vegetables while eliminating not-so-healthy foods from your diet for a few days. But is it?

A juice cleanse involves drinking only fruit or vegetable juices for a certain period of time, usually ranging from one to seven days depending on the goal. Juices are usually pressed, which means that the pulp of the fruit and vegetables is separated from the juice. Common reasons for doing a juice cleanse include losing weight, eliminating “toxins” from the body and giving the digestive system a rest. While fruits and vegetables do provide important vitamins and nutrients, consuming only juice may not be as good for you as it sounds. Before you commit to a juice cleanse, take time to understand the pros and cons.

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