UFC 300 is this weekend. Fighters will lose up to 20 pounds in the five days before weigh-ins. Then they'll gain it all back in the 36 hours before the fight.

We're covering the science of this extreme weight loss and the four lessons you can take from it. You'll learn:

What to do when your weight changes day-to-day.
The truth about low-carb diet results.
How “calories in, calories out” is true but misses the big picture.
How to lose weight in a way that makes you look and feel better—for the long haul.

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Extreme Weight Loss With the UFC's Top Nutritionist