The Mel Robbins Podcast

Do THIS to Boost Your Metabolism, Lose Fat, & Feel Better Now With Dr. William Li

Order your copy of The Let Them Theory 👉 https://melrob.co/let-them-theory 👈 The #1 Best Selling Book of 2025 🔥 Discover how much power you truly have. It all begins with two simple words. Let Them. — In today’s episode, you will learn how to boost your metabolism at any age and the simple changes that lead to better health, longevity, and fat loss. You’ll discover the 4 biggest myths keeping you stuck, how to reset your body’s natural fat-burning system, and what foods to eat (and avoid) to finally feel better in your body. Here to share this information is the world-renowned physician and metabolism expert, Dr. William Li, MD. Dr. Li is one of your favorite experts of all time on The Mel Robbins Podcast, and Mel is thrilled to invite him back to the show to share more tools, research, and insights. He is a physician and scientist whose groundbreaking work on angiogenesis (the study of blood vessels) has impacted more than seventy diseases, including cancer, diabetes, blindness, heart disease, and obesity, and his foundation has educated 40,000 physicians. He has also spent over 30 years researching the connection between food and health, and his findings that he is sharing with you today are nothing short of revolutionary. In this episode, you’ll learn: - The 4 biggest myths about metabolism (and why your “slow” metabolism isn’t the problem). - The top 5 foods that burn fat, fight disease, and fuel your body better. - The real reason you overeat – and how to break the habit. - How you can slow aging, boost energy, and feel better by making a few powerful changes to your daily routine. Dr. Li’s research and advice will change the way you think about your metabolism, food, and your health. For more resources related to today’s episode, click here for the podcast episode page: https://www.melrobbins.com/episode/episode-318/ Follow The Mel Robbins Podcast on Instagram: https://www.instagram.com/themelrobbinspodcast I’m just your friend. I am not a licensed therapist, and this podcast is NOT intended as a substitute for the advice of a physician, professional coach, psychotherapist, or other qualified professional. Got it? Good. I’ll see you in the next episode. In this episode: 00:00 Meet the Guest 02:30 What is Metabolism? 06:28 The 4 Biggest Misconceptions About Metabolism 13:49 How Your Metabolism Changes Over a Lifetime 22:30 What Triggers Weight Gain Inside Your Body 25:52 What Quietly Slows Down Your Metabolism 35:10 How to Reactivate a Slow Metabolism 37:43 3 Foods That Support a Healthy Metabolism 40:12 Let Go of Calorie Counting and Food Stress — Follow Mel: Instagram: https://www.instagram.com/melrobbins/ TikTok: http://tiktok.com/@melrobbins Facebook: https://www.facebook.com/melrobbins LinkedIn: https://www.linkedin.com/in/melrobbins Website: http://melrobbins.com — Sign up for Mel’s newsletter: https://melrob.co/sign-up-newsletter A note from Mel to you, twice a week, sharing simple, practical ways to build the life you want. — Subscribe to Mel’s channel here: https://www.youtube.com/melrobbins?sub_confirmation=1 — Listen to The Mel Robbins Podcast 🎧 New episodes drop every Monday & Thursday! https://melrob.co/spotify https://melrob.co/applepodcasts https://melrob.co/amazonmusic — Looking for Mel’s books on Amazon? Find them here: The Let Them Theory: https://amzn.to/3IQ21Oe The Let Them Theory Audiobook: https://amzn.to/413SObp The High 5 Habit: https://amzn.to/3fMvfPQ The 5 Second Rule: https://amzn.to/4l54fah

Dr. William LiguestMel Robbinshost

Aug 20, 202546mWatch on YouTube ↗

WHAT IT’S REALLY ABOUT

Unlocking Metabolism: Science-Based Steps To Burn Fat And Feel Better

Dr. William Li joins Mel Robbins to debunk major myths about metabolism and explain why most people’s bodies are still hardwired to burn fat effectively well into later life. Drawing on a landmark study of 6,000 people across 20 countries, he outlines four universal phases of metabolism and emphasizes that differences in weight are driven more by lifestyle factors and excess body fat than by fixed “fast” or “slow” metabolisms. He explains how fat forms and functions in the body, why visceral fat and even a “fat tongue” matter, and how stress, alcohol, poor sleep, and overeating impair metabolic health. Dr. Li then shares practical, research-backed strategies—like intermittent fasting, movement, stress reduction, portion control, and specific foods—to reactivate and support a healthy metabolism without obsessing over calorie counting.

IDEAS WORTH REMEMBERING

5 ideas

Most people are born with the same metabolic ‘operating system.’

According to Dr. Li, research shows our baseline metabolism is hardwired similarly, like identical operating systems in new laptops; differences in weight largely arise from lifestyle, excess body fat, and environmental factors—not an inherently “bad” metabolism.

Metabolism does not automatically slow in middle age as much as believed.

A massive study adjusting for body size and excess fat found that from ages 20 to 60, metabolism is essentially flat and stable; only after 60 does it decline modestly (about 17% by age 90), meaning many midlife weight changes are from habits and life stress, not inevitable metabolic collapse.

Excess body fat slows metabolism, not the other way around.

Dr. Li explains that gaining excess fat—especially visceral fat—impairs metabolic efficiency; in other words, fat accumulation can drag your system down, so targeting body fat through lifestyle change can help restore metabolic function.

Fat is a critical, early-forming organ that stores fuel near blood vessels.

Body fat forms very early in development, wrapping blood vessels like bubble wrap so it can act as an accessible fuel tank; fat cells can expand up to three times their size, which is why chronic overeating gradually leads to large increases in stored fat.

Stress, poor sleep, and alcohol quietly sabotage fat-burning.

Chronic stress and associated hormones, shallow or disrupted sleep, and alcohol intake all interfere with efficient fat burning, reduce motivation to exercise, and can increase fat storage—making emotional state and recovery as important as diet and exercise.

WORDS WORTH SAVING

5 quotes

We’re all born with the same metabolism, because our metabolism is like the operating system of a computer.

— Dr. William Li

It’s our body fat that slows our metabolism, not the other way around.

— Dr. William Li

Between the ages of 20 and 60, our metabolism is rock solid, flat as an ocean on a calm day.

— Dr. William Li

One of the most powerful things that you can do to reset your health is to really address the stress in your life.

— Dr. William Li

My message to you is that you’re perfectly normal… Don’t compare yourself to other people. Compare yourself to you.

— Dr. William Li

Debunking common metabolism myths (fast/slow metabolism, age-related decline, teen metabolism)Four life phases of metabolism based on large-scale researchHow body fat develops, types of fat, and the role of visceral fatLifestyle factors that impair metabolism (stress, sleep, alcohol, inactivity)Natural ways to boost fat-burning (intermittent fasting, movement, stress management)Food quality, portions, and the limits of calorie-counting and biohackingSpecific metabolism-supporting foods and nutrients (beans, tomatoes, onions, capers, quercetin)

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