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Alot of the initial weightloss on low carb diets is your body losing all its glycogen stores from your muscles and liver. And since water binds with glycogen, you lose alot of that too. Glycogen depletion is also why if you tried you exercise hard, you would have a blood sugar crash and feel exhausted. Glycogen is what your muscles use for hard aerobic exercise, its also what fuels your brain.
If you run down your glycogen enough, your body and brain will bitchslap you. Its not at all pleasant.
You can get a similar effect by jumping on a bike and cycling for 2-3 hours without eating or drinking anything containing carbohydrates.
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