Most health advice online is recycled nonsense. Here are 5 common "rules" that science has debunked — and what to do instead.

1. "Eat 6 small meals a day to boost metabolism"

Your metabolic rate doesn't change based on meal frequency. A 2019 meta-analysis in Advances in Nutrition found zero difference. Eat when you're hungry. 2 meals, 5 meals — doesn't matter.

2. "Cardio is the best way to lose fat"

Resistance training preserves muscle mass while cutting. Muscle burns more calories at rest than fat. The best fat-loss strategy? Strength training + a caloric deficit. Cardio is a bonus, not the foundation.

3. "You need 8 glasses of water a day"

This was never based on real research. Your body tells you when you're thirsty. Hydration needs vary wildly based on weight, activity, climate, and diet. Drink when thirsty. Check your urine color — pale yellow = good.

4. "Supplements are essential for health"

If you eat a reasonably varied diet, most supplements are expensive urine. The exceptions: Vitamin D (if you're deficient — get tested), omega-3s (if you don't eat fish), and possibly magnesium. Everything else? Marketing.

5. "Stretching before exercise prevents injury"

Static stretching before lifting can actually reduce performance. A dynamic warm-up (leg swings, arm circles, light movement) is what you want. Save static stretching for after.

---

I post breakdowns like this daily inside Health & Fitness Insider — science-backed, no-BS health tips for $4.99/mo. If you're tired of conflicting advice, this is your spot.