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Feeling Faint Issue: I’m happy losing weight with a low carbohydrate diet, but I’m always tired, get light headed when I stand up, and if I exercise for more than 10 minutes I feel like I’m going to pass out. Response: Congratulations on your weight loss success, and with just a small adjustment to your diet, you can say goodbye to your weakness and fatigue. The solution is salt…a bit more salt to be specific. This may sound like we’re crazy when many experts argue that we should all eat less salt, however these are the same experts who tell us that eating lots of carbohydrates and sugar is OK. But what they don’t tell you is that your body functions very differently when you are keto-adapted. When you restrict carbs for a week or two, your kidneys switch from retaining salt to rapidly excreting it, along with a fair amount of stored water. This salt and water loss explains why many people experience rapid weight loss in the first couple of weeks on a low carbohydrate diet. Ridding your body of this excess salt and water is a good thing, but only up to a point. After that, if you don’t replace some of the ongoing sodium excretion, the associated water loss can compromise your circulation The end result is lightheadedness when you stand up quickly or fatigue if you exercise enough to get ‘warmed up’. Other common side effects of carbohydrate restriction that go away with a pinch of added salt include headache and constipation; and over the long term it also helps the body maintain its muscles. The best solution is to include 1 or 2 cups of bouillon or broth in your daily schedule. This adds only 1-2 grams of sodium to your daily intake, and your ketoadapted metabolism insures that you pass it right on through within a matter of hours (allaying any fears you might have of salt buildup in your system). This rapid clearance also means that on days that you exercise, take one dose of broth or bouillon within the hour before you start.
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Jeff S. Volek (The Art and Science of Low Carbohydrate Living: An Expert Guide to Making the Life-Saving Benefits of Carbohydrate Restriction Sustainable and Enjoyable)