I was feeling great with more energy prior and now..... CRASH. yes I'm eating plenty. bacon and eggs for breakfast, grilled chicken, avocado, tomato for lunch. Almonds, blueberry's..etc for snacks. chicken or pork, lots of greens for dinner...etc. my sleep hasn't been the best. 6-7 hrs and i sometimes wake during the night. oh! and I've been getting headaches also.
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Yes! It is definitely normal. I had something similar happen where the first few days I had a ton of energy and I ended up being extremely tired around day 8 (one week or so into it). Once I stuck through it, the carb flu had passed a couple of days later. :)
If you focus on what you're eating (like you are now), and maybe try to up your sleep quality/quantity you'll feel like you were before.
If you're doing VLC (Very Low Carb), You've hit the low carb flu. It's normal, stick with it a while, it'll pass. Make sure you eat plenty of protein and fats.
Maybe raise the carbs in a few days if it doesn't go away, but the goal is to show your cells that hey, there's this other source of available energy from fats and ketones, you can burn that too, so they can make the metabolic switch.