Everyone knows GLP-1 medications help people eat less. But does eating less actually mean eating better? It’s a question the weight loss field never really had to ask before, and the answer might surprise you.

Join Holly and Jim as they dig into three GLP-1 studies looking at what people are actually eating. You’ll hear the real numbers behind diet quality, protein intake, and nutrient gaps on these medications, plus what it means for anyone currently taking (or considering) a GLP-1. Holly and Jim also share five practical tips to help ensure your diet works as hard as your medication is.

Discussed on the episode

• Why losing weight on a GLP-1 doesn’t automatically mean you’re eating a healthier diet
• The surprising “Healthy Eating Index” scores researchers found in people taking these medications.
• Which micronutrients tend to slip through the cracks when food intake drops
• The protein timing pattern showing up in the data and why it might matter.
• Whether cravings actually go away on GLP-1s, or if that’s a myth
• Five things anyone on a GLP-1 can do right now to protect their diet quality
• Answers to listener questions on appetite loss, ongoing hunger, and whether there’s a “best” GLP-1 diet
• A teaser for the next episode, which flips the lens to physical activity on GLP-1s

Think you know what it takes to keep weight off? Most people can tell you how to lose weight, but ask them what actually predicts keeping it off, and the answers get shaky fast. That’s a problem, because losing weight and maintaining weight loss are two completely different biological and behavioral games, and confusing the two is one of the biggest reasons people yo-yo.

In this episode, Holly and Jim put their listeners to the test literally. They’ve built a 20-question pop quiz covering everything from the hidden biology of metabolic adaptation to the real findings from the National Weight Control Registry, the groundbreaking study Jim co-founded three decades ago. And because so much has changed recently, they’re also tackling the question everyone’s asking: does any of this still apply in the age of GLP-1 medications?

Grab a pen (or play along in your head) and see how many you get right. Some answers might surprise you, and a few might change how you think about your own weight loss journey for good.

Discussed on the episode:

• Why the biology of losing weight and the biology of keeping it off are two entirely different processes, and why not knowing this is setting you up to regain
• What really happens to your metabolism after weight loss, and whether “metabolic adaptation” is something you should actually be worried about
• The hunger hormone changes that don’t go away and what that means for your day-to-day life
• The real math behind the “energy gap,” a concept Jim and Holly coined themselves
• What the National Weight Control Registry’s 30,000+ members actually do differently, including the surprisingly unglamorous form of exercise most of them rely on
• Whether successful maintainers take weekends and holidays “off” from their habits
• The truth behind the infamous “95% of diets fail” statistic.
• Whether losing weight slowly really does make you more likely to keep it off.
• Why willpower isn’t the key predictor of long-term success and what is
• What happens to the body when someone stops taking a GLP-1 medication, and whether that counts as the medication “failing”
• The most vulnerable window for regain during medication-assisted weight loss and why most people prepare for the wrong phase
• A rapid-fire round covering daily weighing, running vs. walking, and the most overrated maintenance strategy out there

What did humans actually evolve to eat? With paleo, keto, vegan, Mediterranean, and a thousand other diets all claiming to be "the one," it's no wonder people feel whiplashed every time they walk into a grocery store. But what if the answer isn't found in the latest diet book, but in millions of years of human evolution?

Join Holly and Jim as they welcome back Harvard evolutionary biologist Dan Lieberman for a second appearance on the show. This time, Dan isn't talking exercise. He's talking food. Drawing on his new book, "Fed Up: What Evolution Reveals About Food, Diet, Health, and Eating Well," Dan explains why there's no single "evolutionary diet," why our supermarkets are a completely unprecedented environment for the human brain, and why willpower alone was never going to be enough. And because Dan doesn't just study diets, he lives them. He shares the surprisingly rough personal experiments he and his wife put themselves through in the name of research.

By the end of this episode, you'll understand exactly why eating well feels so hard in the modern world, and why that struggle has nothing to do with a lack of discipline.

Discussed on the episode:

• Why an evolutionary biologist says there's no such thing as "the" diet humans evolved to eat
• The "naturalistic fallacy" and why what our ancestors did isn't automatically what we should do
• What happened when Dan and his wife tried a raw food diet for several days (and why it ended with a bagel)
• The one natural food that's high in both sugar and fat, and what it reveals about why we crave certain foods
• How food processing quietly changed what's actually in your food, long before you ever open the package
• Why Dan calls modern ultra-processed foods "hyper-matched" to our brains
• The real reason low-carb and low-fat diets can both work, and why neither is right for everyone
• What Dan learned trying the Atkins diet as a self-described "carboholic"
• Why the Mediterranean diet keeps coming out on top, and whether that's fair to other traditional diets around the world
• His take on the vegan vs. carnivore debate, and why he wouldn't attempt one of them
• A listener's question about why the same diet can work great for one person and fail for their sibling
• Practical advice for eating well on a tight grocery budget
• The one thing Dan wants every listener to remember about their own struggles with food.

Resources mentioned:

• Dan Lieberman's book: "Fed Up: What Evolution Reveals About Food, Diet, Health, and Eating Well"