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The Keto Subreddit (http://www.reddit.com/r/keto) has a lot of good information, too. That's where I started.
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It has to do with your body changing over from sugar-burning to fat-burning. The "keto flu" comes from not drinking enough water and not replacing the electrolytes that are being lost. The "keto flu" is quickly "cured" by drinking some broth or boullion to increase the sodium and potassium levels.