Why You’re Not Losing Weight: Fitness Myths Debunked with Lyle McDonald’s No-Nonsense Truth Bombs

If you've ever stood on the scale, scratched your head, and muttered, “Why am I not losing weight?!”, you're not alone—and you might be falling for one of the many fitness myths out there. In this hilarious and eye-opening episode of Nacho Fitness Coach, Sara and Caleigh dive deep into a viral Instagram post by body recomposition expert Lyle McDonald, unpacking the top reasons people aren't shedding pounds—and what’s actually going on instead.

Spoiler: It’s probably not your insulin.

🥼 Who’s Lyle McDonald?

Lyle McDonald is a bit of a cult legend in the fitness science space—part researcher, part social media ranter, and fully committed to calling out BS in the weight loss world. He specializes in body recomposition (translation: losing fat while gaining or maintaining muscle), and he’s not afraid to ruffle feathers while doing it.

In late 2023, Lyle posted a viral breakdown titled: “Reasons You’re Not Losing Weight,” featuring two columns—Myths vs. Realities. Sara, the expert, and Caleigh, the everywoman fitness newbie, unpacked the post and had a few laughs (and a few eye-rolls) along the way.

🔥 8 Weight Loss Myths Lyle McDonald Wants You to Ditch

1. Myth: You’re not losing weight because your insulin is too high
   Reality: You’re underestimating your food intake.
   → Most of us aren’t great at tracking our portions—even with “healthy” foods.
2. Myth: Eating carbs is the problem
   Reality: Your diet is too restrictive, causing you to binge.
   → Cutting entire food groups can backfire big time.
3. Myth: You’re not eating “clean” enough
   Reality: A rigid eating mindset may be doing more harm than good.
   → Obsessing over purity isn’t the same as making sustainable choices.
4. Myth: Starvation mode or metabolic damage is stopping weight loss
   Reality: It might just be short-term water retention.
   → The scale isn’t always telling the whole story.
5. Myth: Your metabolism is just too slow (or you have thyroid issues)
   Reality: This may apply to a few, but it’s not the norm.
   → Most people just need to move more and eat less (consistently).
6. Myth: You’re following the wrong “magic” diet
   Reality: Your mindset around eating might need the real reset.
   → There’s no single “perfect” diet—what matters is what works long-term.
7. Myth: You’re genetically doomed
   Reality: Your habits still matter.
   → Your choices shape your results more than your DNA does.
8. Myth: Confusing, misleading advice from fitness professionals
   Reality: The industry is filled with noise. You deserve better info.
   → If someone says “do your own research,” make sure they’re also educating, not gatekeeping.



Caleigh may not love Lyle’s tone (he’s a little intense), but both she and Sara agreed that his message is mostly spot on. He’s a research-based realist who’s trying to cut through the social media fluff with a little fire and sarcasm.

🧠 Between Sets? Do This Instead:

Lyle also dropped gold in a lesser-known post: “Five Things to Do Between Sets Instead of Scrolling.” His suggestions?

• Analyze your last set and ask how you can improve
• Think about your technique
• Check in: Are you really training as hard as you think?
• Flex the muscle you’re targeting to improve mind-muscle connection
• If you must use your phone, make it useful: track your sets or record form

✅ Key Takeaways from the Episode

• Body recomposition—not just weight loss—is often the real goal.
• Many people sabotage their own progress by obsessing over diets, cutting too many calories, or blaming things like insulin or metabolism.
• Fitness info online can be misleading or overly complicated—find sources you trust.
• Between-set scrolling is killing your focus. Be present in your workout!

🔎 Final Thought

Weight loss isn’t magic—it’s methodical. And sometimes the truth is less sexy than a trending diet. But with a little honesty, a dash of humor, and a solid plan, you can ditch the myths and make real progress.