Nutrition Myth Buster: Why Daily 16:8 Fasting Can Actually Backfire

Dr. Josie Tenore, MD, MSc
Dr. Josie Tenore, MD, MSc
4 min read

"You Should Fast Every Day To Lose Fat and Live Longer." Let’s Pump the Brakes.

Yes—fasting can help reduce insulin, trigger autophagy, and support longevity. Yes—skipping the midnight snacks and giving your gut a break is smart.

But doing a 16:8 fast every single day can backfire.

Over time, it sends a signal to your body: "Danger. Food is scarce. Slow everything down."

  • Your metabolism can adapt
  • Your thyroid may downregulate
  • Women, especially in midlife, may feel anxious, fatigued, foggy, or inflamed

The result? You stop burning fat efficiently and feel worse, not better.

So What Should You Do?

Use intermittent fasting intermittently.

  • Try 16:8 twice per week (not daily)
  • Let your body feel some stress, but not starvation
  • Cycle your food intake like your workouts: challenge + recover

This keeps your metabolism flexible, not fearful.

What I Personally Do

"I’m just not hungry in the morning. So I enjoy a latte, then 2–3 hours later, I’ll have a mini meal—protein, healthy fat, some carbs. Twice per week, I’ll go longer with just black coffee until noon to get that fasting edge—without living in fasting mode."

This is real-world longevity—not influencer fasting extremes.

If you’re fasting daily and feeling stuck, your body may be telling you it’s time to eat more strategically, not less rigidly.

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Dr. Josie Tenore is a board-certified family physician and founder of TREVI Longevity & Aesthetics Institute in Highland Park, IL. She specializes in medically supervised weight loss, hormone therapy, and aesthetic treatments.

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