You'll feel differently depending on how many carbs you're used to eating. Right now, you're body is switching fuel sources. Since you haven't switched fully into "fat burning for energy" mode, you're short on glucose. It should pass in a day or two. I felt pretty crummy for the first 2 days, then on day 3 got better, and on day 4 felt the same as always.
Just be careful if it's killer cold outside. My first two days were SUPER COLD days, and I could NOT get warm for the life of me. Once my body made the "switch" to burning fat for energy, things got better.
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