What’s a Sign That Intermittent Fasting Isn’t Working for You?
15 Dec 2025 · 7 min
Nurse practitioner Cynthia Thurlow explains when intermittent fasting backfires. Watch for sleep problems, low energy, headaches, or dizziness. She recommends checking hydration and electrolytes first, then adding protein and healthy fat to your eating window.
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Hey Jill, thanks for your question. You know, I would start with if you are using intermittent fasting for a strategy and you're not able to sleep, meaning all of a sudden you've been sleeping well and now you're waking multiple times a night or you're having trouble falling asleep, could be a sign it could be an issue with blood sugar, could also be an issue that you haven't just haven't had enough macronutrients during your feeding window. Nonetheless, that kind of change is something we want to really be mindful of. Also, if you're experiencing a reduction in energy, you're really tired, you're experiencing headaches or dizziness, it could be a sign of dehydration. It could also be a sign that it's just a strategy that's not working for you at that period of time. And I would really encourage you to make sure you're staying really well hydrated, getting in those electrolytes, making sure that every meal incorporates protein and a healthy fat to keep that blood sugar stable. And then if you're still struggling to figure out what could be going on, I would ensure that you're working with someone that can help you kind of really dive into troubleshooting and getting a better sense of what's going on.
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