This week, Zoë mailed a chunk of her hair to a stranger in Florida. For science. For journalism. For your benefit, really. The $60 hair sample test came back flagging her as "highly reactive" to 210 foods, including emu, ostrich egg, hot dog, and ground horse meat. Reader, she has not eaten ground horse meat in over a decade.

The food sensitivity industry is a multi-billion-dollar grift built on real symptoms and fake frameworks. We trace it from 1906, when allergy was first defined as a real clinical thing, through the 1950s clinical ecology movement, through cytotoxic testing, IgG panels, electrodermal screening, and bio-resonance, and finally to the at-home hair test in your DMs. It's the same idea in different packaging every decade. Like a body-snatcher, but for grift. (We use a lot of John Carpenter references in this one.)

Then Kylee walks through what the science actually says: the difference between IgE allergies, IgG sensitivities, and intolerances. What real diagnostic testing looks like (skin prick tests, blood panels, hydrogen breath tests, structured elimination diets with a professional). Why hair testing, IgG panels, and bio-resonance devices have no validated diagnostic mechanism. And why these tests disproportionately target women, who are statistically more likely to feel dismissed by their doctors and more likely to seek answers in the wellness market.

We also get into why endurance athletes are uniquely vulnerable to this stuff. When your gut acts up during training, the wellness industry hands you a list of 210 foods to eliminate. Your sports dietitian hands you a fueling plan. Guess which one tends to lead to a stress fracture.

The bottom line: your symptoms deserve a real answer. Don't let a hair test substitute for actual care.

This episode is supported by:

rabbit — Use code YOURDIETSUCKS10 for 10% off at runinrabbit.com Their trail line is genuinely the only running gear we actively look forward to wearing.

Tailwind Nutrition — Use code YOURDIET20 for 20% off at tailwindnutrition.com. Endurance fuel that doesn't taste like a chemistry set. Try the Mandarin Orange or the Daily Hydration Strawberry Lemonade.

Osmia Skincare — Use code YDS20 for 20% off at osmiaskincare.com. Clean, science-forward skincare from a real-deal physician-founder. The Himalayan Salt Scrub and Lavender Body Mousse are the post-long-run reset.

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Website: yourdietsuckspodcast.com — full episode pages, references, transcripts, and the blog.

Patreon: patreon.com/YourDietSucks — bonus episodes, monthly Q&As with Kylee, and the community thread. $3/month keeps us independent and ad-manager-free.

Merch: teepublic.com/user/your-diet-sucks — TeePublic shop. (Heads up: free Patreon members can win a YDS shirt by joining a paid tier between now and May 31. Drawing June 1.)

If this episode helped, send it to a friend who's been thinking about mailing their hair somewhere. Word of mouth is how this show grows.

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In 1997, a 14-year-old named Nathan Zahner convinced 43 out of 50 classmates to sign a petition banning a dangerous chemical called dihydrogen monoxide. The chemical was water. This episode is everything that happened next, scaled up to a $50 billion industry and, eventually, federal food policy.

Zoë and Kylee trace the naturalistic fallacy: the assumption that natural equals good and artificial equals bad. It's the implicit logic behind clean eating, anti-GMO panic, supplement marketing, anti-vaccine rhetoric, and a significant chunk of sports nutrition culture. This episode follows that logic from Sylvester Graham's Victorian theories about white flour and masturbation, through John Harvey Kellogg's Battle Creek Sanitarium, through the Make America Healthy Again commission's 2025 decision to replace heavily regulated synthetic dyes with natural alternatives that are, it turns out, subject to less FDA oversight than the dyes they replaced. Botulinum toxin is completely natural. Synthetic folic acid has prevented hundreds of thousands of neural tube defects. Nature is not a wellness coach. Your mitochondria are not reading the label.

FREE T-SHIRT GIVEAWAY — ends April 19thTwo ways to enter: leave a review on Apple Podcasts and DM us a screenshot on Instagram @yourdietsuckspodcast, or share any episode to your Instagram stories and tag us. Do both for two entries. Winner announced Saturday April 19th. US residents only.

SUPPORT THE SHOW: Join the Patreon at patreon.com/YourDietSucks — bonus episodes, Kylee's Q&As, Zoë's monthly blog, and a community of people who find this stuff as interesting as you do. Starting at $3/month.

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THIS EPISODE IS SUPPORTED BY

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Microcosm Coaching — Free consultation at microcosm-coaching.com

Find full episode transcripts, show notes, and research at yourdietsuckspodcast.com. Grab merch at teepublic.com/user/your-diet-sucks. And if you want bonus episodes, early access, and our eternal gratitude, support us on Patreon at patreon.com/YourDietSucks.

Caffeine is the most widely consumed psychoactive substance on earth — and somehow it's still got two extremely loud camps screaming past each other. On one side: the wellness-bro "caffeine destroys your adrenals, drink my mushroom latte" crowd. On the other: the guy on TikTok who takes 800 milligrams a day and wants you to up your dose. Both of them are wrong. Both of them are extremely entertaining.

In this episode, Zoë and Kylee dig into how caffeine actually works, the adenosine receptor science, the performance research, the optimal dosing for endurance athletes, and what it's actually doing to your sleep, hormones, and anxiety levels (spoiler: more than you think, less than the fear-mongers claim). They trace the history of human caffeine consumption from ancient China to Sufi monks using coffee as a pre-workout for night prayer, through the Enlightenment coffee houses that accidentally invented capitalism, all the way to a 300-milligram neon energy drink with a skull on it.

There's also a full breakdown of the pre-workout industry's stimulant escalation problem, why adrenal fatigue isn't a real diagnosis, how your menstrual cycle affects caffeine metabolism, and whether the caffeine taper before a race is actually worth the two weeks of misery.

Plus: the 1904 Olympic Marathon featured rat poison, brandy, and a man who hitched a ride in a car for 11 miles. Dry scooping sent multiple people to the hospital. And "energy is a choice" is not a peer-reviewed finding.

We cover it all.

This episode is supported by rabbit — use code YOURDIETSUCKS10 at runinrabbit.com/collections/womens-new for a discount on their trail line. By Osmia Skincare — use code YDS20 at osmiaskincare.com for 20% off. By Tailwind Nutrition at tailwindnutrition.com. And by Microcosm Coaching at microcosm-coaching.com.

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Check out our website for references, transcripts, and more!

Diet culture is really good at one thing: finding the places people go to belong, and nesting inside them. This episode follows that instinct back to one of its oldest sources, the American evangelical church. Zoë and Kylee are joined by Leslie Schilling, RDN, CSSD, sports dietitian, eating disorder specialist, and author of Feed Yourself, to trace how food, bodies, and spiritual worthiness got so tangled together, and what it costs the people caught inside that tangle.

From Pope Gregory's taxonomy of gluttony in the sixth century to Rick Warren's Daniel Plan weigh-ins, "your body is a temple" taken wildly out of context, and why eating disorders tied to religious identity are among the hardest to treat. You don't have to have ever set foot in a church to have received this transmission.

Support Your Diet Sucks on Patreon for bonus episodes, weekly threads, recipes, and AMA access: patreon.com/yourdietsucks.

This episode is brought to you by rabbit — use code YDSMARCH10 for 10% off at rabbit.com. Osmia Skincare — code YDS20 for 20% off at osmiaskincare.com. Tailwind Nutrition — code YOURDIET20 for 20% off at tailwindnutrition.com. And Microcosm Coaching — book a free consultation at microcosm-coaching.com.

Get "Carb Slut" and "Petty and Scientifically Literate" merch here!

Whole30 has sold millions of books, built a coaching empire, and partnered with Chipotle and Walmart — all without a single peer-reviewed clinical trial. In this episode, Zoë traces the program from its origin on a CrossFit blog in 2009 to its multi-million dollar licensing ecosystem, digs into the loaded vocabulary (sugar dragons, tiger blood, sex with your pants on), and examines what happened when a nutrition science student fact-checked all 450 citations in It Starts With Food. Kylee breaks down how real elimination diets work, why this one poses specific risks for athletes, and what the plant-based Whole30 contradiction reveals about whether the rules were ever based on science at all.

Support Your Diet Sucks on Patreon for bonus episodes, weekly threads, recipes, and AMA access: patreon.com/yourdietsucks.

This episode is brought to you by rabbit — use code YDSMARCH10 for 10% off at rabbit.com.

Osmia Skincare — code YDS20 for 20% off at osmiaskincare.com.

Tailwind Nutrition — code YOURDIET20 for 20% off at tailwindnutrition.com.

And Microcosm Coaching — book a free consultation at microcosm-coaching.com.

Intermittent fasting is the most Googled diet-related term on the planet, except everyone who does it will tell you it's not a diet. It's a protocol. An eating window. A lifestyle. An optimization hack. Definitely, absolutely, under no circumstances a diet. You just don't eat for sixteen hours. Totally different.

In this episode, we trace IF from ancient religious fasting traditions through its secularization and commodification, afrom Martin Berkhan's Leangains forum and its tagline ("fuck breakfast") to Michael Mosley's BBC documentary, Hugh Jackman's Wolverine physique, and Jack Dorsey describing his weekend-long fasts as "hallucinating" like that's a selling point. We walk through how a Nobel Prize in yeast biology became a justification for skipping breakfast, why Jason Fung's The Obesity Code scored 31% on scientific accuracy and still became the IF bible, and how the fasting app market turned one simple rule into a multimillion-dollar industry.

Then we get into what the science actually says. We break down the claimed mechanisms — metabolic switching, autophagy, insulin sensitivity — and look honestly at where the evidence lands. Spoiler: the mechanisms are real, but the confidence far outpaces the human data. The first direct measurement of autophagy in humans was published in 2025. Mouse metabolism runs seven times faster than ours. And the landmark Liu et al. trial in the New England Journal of Medicine found that time-restricted eating is no better than regular caloric restriction for weight loss. You're not metabolic switching. You're just eating less.

We also dig into what IF means for active people (no performance benefit across any exercise type, real risk of under-fueling and RED-S, and a protein distribution problem that no eight-hour window can solve), what the AHA, ADA, NIA, and ISSN actually say about it, and the robust research linking IF to eating disorder behaviors across all genders — including a landmark study showing that fasting was a stronger predictor of binge eating disorder than any other form of dietary restraint. Fasting is listed in the DSM-5 as a compensatory behavior. Just because you give it a different vocabulary doesn't mean your body experiences it differently.

Your body is smarter than any fasting app. Also, breakfast slaps..

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Hosted by: Zoë Rom & Kylee Van Horn, RDN

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The wellness industry wants you to believe your body is on fire. Tired? Inflamed. Bloated? Inflamed. Sad? Believe it or not, inflamed. But what does inflammation actually mean, and should athletes be worried about it?

In this episode, we trace how inflammation went from a specific biological process to a wellness Rorschach test that can sell you anything from turmeric lattes to $200 supplement stacks. Zoë covers the history, from 1970s eicosanoid research to the glucose goddess's empire of banana fear, while Kylee breaks down what the research actually shows about anti-inflammatory diets.

We cover the Mediterranean diet, elimination protocols like AIP, why sugar isn't the devil, why most inflammation claims come from rodent studies using absurd doses, and why under-fueling might be more inflammatory than anything in your pantry. Plus: why nightshades sound like a goth stripper.

This Episode's Sponsors:

rabbit — Code YDSFEB for 10% off

Osmia — Code YDS20 for 20% off

Tailwind — Code YOURDIET20 for 20% off

Microcosm Coaching — Book a free consultation

Full references, episode archive, and our advertising ethics policy at yourdietsuckspodcast.com

Hosted by: Zoë Rom & Kylee Van Horn, RDN

⁠Check out our website for a full list of episodes and references!⁠

Support us on Patreon, or Apple Subscriptions or Spotify Premium!

Can you build muscle, train hard, and actually perform on a vegetarian diet? Do plant-based eaters need more protein? Is iron deficiency a real concern or just wellness industry noise? This week, Zoë and Kylee dig into what the research actually says about vegetarian diets for athletes and active people, no Game Changers propaganda, no carnivore fear-mongering, just science.

Turns out vegetarian athletes do need about 20-30% more protein than omnivores to achieve the same muscle protein synthesis. Kylee explains why leucine matters, what PDCAAS scores actually mean, and which plant proteins are worth prioritizing (and which ones are working against you). Then Zoë gets quizzed on iron, B12, zinc, omega-3s, and protein combining in a game called Truth or Deficit, and her performance is, frankly, embarrassing for someone who's been vegetarian since age 17.

They also talk about something that doesn't get discussed enough: the research linking vegetarianism and disordered eating. Studies show plant-based eaters are about twice as likely to report orthorexic symptoms as omnivores, and Zoë gets honest about her own history using veganism as eating disorder cover.

Plus: 2,500 years of people being unhinged about dietary purity, including Pythagoras possibly getting murdered because he refused to walk through a bean field, the anti-masturbation origins of graham crackers, and how "you are what you eat" thinking has been claimed by feminist abolitionists and literal Nazis alike. The plants aren't the problem. The purity logic might be.

Vegetarian diets can absolutely support your training and your health. They just require more planning, more attention to a few key nutrients, and an honest conversation with yourself about why you're doing it.

Sponsors:

• Osmia Skincare — Code YDS20 at osmiaskincare.com for 20% off
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