Switch4Good

328 - #1 Fasting Researcher: Why Intermittent Fasting Works WITHOUT Calorie Cutting | Courtney Peterson

Switch4Good

Show Notes

"The morning, up until around lunch, is the best time of day to eat most of our calories. And in fact, there's been really great research. Even if you don't change the timing of your meals, if you make breakfast and lunch the largest meals of the day and dinner the smallest meal of the day, you lose more weight. And not only do you lose more weight, you're actually less hungry." -Dr. Courtney Peterson "Talk about these time intervals. Why is 14 a magic number?" -Jason Wrobel "Typically, it takes the body about 12 to 14 hours to burn through a lot of its glycogen stores. Initially after a meal, your body's gonna be burning a lot of carbohydrates—so, glucose. It's gonna burn through a lot of the actual food in the meal, then it'll store some, burn others." -Dr. Courtney Peterson "Are there any scientifically reported benefits for hormone health, or managing cancer, with TRE?" -Jason Wrobel "The area of cancer is super fascinating. Valter Longo does a lot of work in both the realms of aging and longevity, and cancer. Many years ago, he and some collaborators discovered if you fast cells or animals with cancer prior to treating the cancer with chemotherapy and radiation, you could kill tumors far more effectively." -Dr. Courtney Peterson What if the timing of your meals mattered just as much as the food on your plate? In this episode, we're diving into the fascinating science of time-restricted eating with Dr. Courtney Peterson—one of the world's leading researchers on how aligning our meals with the body's internal clock can transform our health. A Harvard-trained scientist and Associate Professor of Nutrition Sciences at the University of Alabama at Birmingham, Dr. Peterson was the first to test early time-restricted eating in humans, and her groundbreaking work is redefining how we think about metabolism, energy, and chronic disease. If you've ever wondered if nourishment runs deeper than nutrients—that your body might be seeking harmony—then this episode will strike a chord. What we discuss in this episode: Different types of intermittent fasting: how they compare, and what benefits they offer.

The science behind time-restricted eating (TRE).

How TRE supports weight loss and appetite regulation.

Fasting, aging, and the process of autophagy.

The best time of day to consume the majority of your calories.

How meal timing can influence fertility and reproductive health in women.

Grazing vs. structured mealtimes: what the science shows.

The intersection of cancer treatment and fasting: what emerging research reveals.

Hypertrophy and intermittent fasting.

How fasting influences exercise performance.

Dr. Peterson's personal approach to intermittent fasting.

Resources: Courtney Peterson Profile | University of Alabama at Birmingham

Click the link below to support the FISCAL Act https://switch4good.org/fiscal-act/ Share the website and get your resources here https://kidsandmilk.org/ Send us a voice message and ask a question. We want to hear from you! Switch4Good.org/podcast Dairy-Free Swaps Guide: Easy Anti-Inflammatory Meals, Recipes, and Tips https://switch4good.org/dairy-free-swaps-guide SUPPORT SWITCH4GOOD https://switch4good.org/support-us/ ★☆★ JOIN OUR PRIVATE FACEBOOK GROUP ★☆★ https://www.facebook.com/groups/podcastchat ★☆★ SWITCH4GOOD WEBSITE ★☆★ https://switch4good.org/ ★☆★ ONLINE STORE ★☆★ https://shop.switch4good.org/shop/ ★☆★ FOLLOW US ON INSTAGRAM ★☆★ https://www.instagram.com/Switch4Good/ ★☆★ LIKE US ON FACEBOOK ★☆★ https://www.facebook.com/Switch4Good/ ★☆★ FOLLOW US ON TWITTER ★☆★ https://twitter.com/Switch4GoodOrg ★☆★ AMAZON STORE ★☆★ https://www.amazon.com/shop/switch4good ★☆★ DOWNLOAD THE ABILLION APP ★☆★ https://app.abillion.com/users/switch4good

More from Switch4Good

Oct 14, 2026

Every October, a sea of pink ribbons reminds us that breast cancer touches millions of lives. But how often do we talk about what may contribute to its development, and what we can do to help prevent it? In this powerful episode, renowned breast cancer surgeon Dr. Kristi Funk, founder of the Pink Lotus Breast Center and bestselling author of Breasts: The Owner's Manual, takes us through some surprising factors that may influence breast cancer risk, the role nutrition and lifestyle can play, and common myths that deserve debunking. Join us for a deep dive into the latest scientific evidence on breast cancer prevention, and what it could mean for your health. What we discuss: How Dr. Funk's views on breast cancer prevention have broadened over the course of her career.

Oct 7, 2026

At over 400 pounds, Tim Kaufman lived on fentanyl, painkillers, vodka and fast food. His blood pressure hit 255/115. Today he has lost 200 pounds on a whole-food, plant-based diet and races half Ironman triathlons. Tim explains how a 30-day juice fast and Forks Over Knives changed his life, and how cutting dairy ended his joint pain and eczema. He shares what he eats in a day and how he lives with Ehlers-Danlos syndrome. He talks about coming back from spine surgery and an ankle fusion. He also tells the story of a type 2 diabetic in his cooking class who reversed his diabetes. What we discuss: Tim shares his condition as a child and how it led him to live a life of physical and emotional pain

Sep 23, 2026

"Willpower is just a part of it. Change really happens when you change your environment." Dave Wegener is a high school visual arts teacher, husband and father. He grew up overweight, loved McDonald's and called himself a volume eater. In 2016 he hit 335 pounds and his triglycerides were at 424. His doctor wanted to put him on medication. Dave said no. He made a deal with his doctor instead. He would eat fewer calories, draw every meal in a sketchbook food journal and walk 30 minutes a day. Those small steps led him to Forks Over Knives and a whole food, plant-based diet. He went on to lose over 100 pounds. Dave is open about his slip-ups, including gaining weight back during the pandemic. That's what makes his story so relatable. In this episode he shares how he handles cravings, how he eats well at work and the one breakfast swap that started it all. What we discuss: Dave's journey from 335 pounds to over 100 pounds lost, without meds

Sep 9, 2026

What happens when you take one of America's most culturally diverse food cities and put plants at the center of the plate? Ellen Kanner takes us deep into the flavors, traditions, and food memories that shaped her as a fifth-generation Miamian, chef, and author, sharing how she reimagines beloved dishes without losing the flavors, textures, and cultural meaning that make them special. Along the way, she shares her "Rule of One," challenges some of the biggest myths about plant-based cooking, and makes a compelling case for approaching food as a full-body experience. It's a delicious conversation about culture, identity, creativity, and opening the door to endless culinary possibilities. What we discuss: How Ellen learned to cook.

Aug 26, 2026

Physiotherapist, nutritionist, and The Proof is in the Plants author Simon Hill joins Dotsie and Alexandra to trace how a single terrifying moment reshaped his entire career, and what the evidence really says about eating for a long, healthy life. When Simon was 15, he watched his father, just 41 years old with no prior health issues, suffer a heart attack right in front of him on a remote Sunday afternoon. That day, combined with a growing frustration over the "bro science" he was fed while working with elite AFL and VFL athletes, sent him back to school for a master's in nutrition science and set him on a lifelong, evidence-based mission. In this conversation, Simon explains why our genes load the gun but our lifestyle pulls the trigger when it comes to chronic diseases like heart disease, type 2 diabetes, and dementia. He unpacks the gut microbiome and why anyone coming off a low-fiber Western diet should ramp up plants gradually, treating fiber like a gym program rather than going gung-ho overnight. Dotsie and Simon trade practical, failure-proof tips for making beans and legumes easier to digest, and Simon delivers a masterclass in "lectinology," dismantling the fear-based claims of The Plant Paradox with a clear look at what the science actually shows.

See all episodes →