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Searching for the Fountain of Youth

Lecture given by Dr. Joe Schwarcz

Why Sunscreen Still Beats Steak

An influencer claims your sunburn is caused by seed oils, not skin type or sunscreen. The truth? He’s misreading a human study, ignoring key data, and forgetting one crucial thing: credentials.

This story started like many modern tales of data distortion do, where the science isn’t denied outright, but bent just enough to fit a more convenient (and lucrative) narrative. Let me regretfully introduce you to Kashif Khan—a self-proclaimed “Truth Teller and Longevity Innovator”. It should be noted, however, that for a man who has built his career around dispensing health advice, his résumé appears to be entirely free of anything resembling a medical or scientific qualification. No degree, no training, not even a suspiciously vague wellness certification. Just a shiny Instagram feed, a masterclass to sell, and the unshakable confidence of someone who’s never had to survive peer review.He recently informed his 850,000 Instagram followers that the reason some people burn in five minutes and others can tan all day has nothing to do with their genes, skin type, or sunscreen application habits. Nope, he says, it’s all about diet. , inflammation is the true enemy of sunburns, and if you just eat like a caveman, you too can become UV-proof.

Reader, I laughed. Then I wept for science.

Influence of Dietary Factors on Actinically-Induced Skin Cancer: Kashif’s Version

Khan's video, which falls somewhere between biohacking sermon and wellness-themed Mad Libs, references a . In his telling, researchers fed mice either a “standard American diet” or a carnivore diet, then exposed them to sunlight. The outcome? A quarter of the seed-oil-and-carb mice allegedly developed skin cancer, while the meat-only mice emerged unscathed, presumably flexing their tiny biceps in triumph.

Let’s set aside, for a moment, the glaring absurdity of claiming “0%” in any scientific context (seriously, if someone says something has no risk, run). What’s more baffling is that this paper? It doesn’t say what Khan thinks it does.

The Study That Wasn’t

Khan claims this study from Baylor University proved his point. According to him, mice on a “standard American diet” (a cocktail of seed oils, sugar, and processed carbs) were more likely to develop skin cancer after sun exposure, while those on a “carnivore diet” emerged cancer free.

Only… that’s not what the study said. At all.

The actual research looked at the effect of dietary fat—not meat—on the development of UV-induced skin cancer. The study Khan references builds its investigation on a series of animal studies conducted in the 1980s. In one of those studies using a mouse model, the animals fed a high-fat diet developed more tumors, and they developed them faster. But when the mice were switched from a high-fat diet to a low-fat diet after UV exposure, there was a reversal of the exacerbating effect of high fat intake on skin cancer development. So, no—they weren’t saved by steak. They were saved by reducing their dietary fat consumption.

But wait, there’s more. The real gem here is that Khan’s dramatic retelling somehow fumbled the fact that the study was done on humans. Yes, humans. Like you and me. The researchers followed 115 patients with skin cancer, splitting them into two groups: one continued with their regular diet, while the other adopted a low-fat regimen (20% of calories from fat). Over two years, the low-fat group had significantly fewer pre-cancerous skin lesions and a decline in new non-melanoma skin cancers.

Carnivore diet? Nope. Just some moderation and actual science.

Is it Cherry Season?

What Khan is doing here is classic cherry-picking: taking one study (that he both misinterprets and misrepresents) and presenting it as universal truth. He ignores the larger body of evidence and the crucial scientific principle that one study never tells the whole story.

According to the site , cherry-picking is when only the evidence that supports your claim is shown, while counter-evidence is conveniently tossed aside like an empty supplement bottle.

It’s a fallacy as old as time—and can as profitable as it is misleading.

So, What’s the Real Deal?

Here’s the honest, non-clickbait version:

  • Lowering dietary fat intake may help reduce the development of certain types of skin lesions and non-melanoma skin cancers, especially in people already at risk.
  • Your skin’s response to sun has a lot to do with genetics, skin type, and UV exposure—not just whether you eat kale or keto.
  • No, there is not a 0% risk of cancer in any credible scientific context. If someone promises that, they’re selling something (probably their masterclass).
  • Sunscreen still works. Wear it. No matter how many steaks you eat.

The Takeaway

This isn’t about canceling carnivores (although read here why the carnivore diet isn’t all it’s cracked up to be) or defending seed oils. It’s about calling out people who weaponize science with just enough buzzwords to sound credible—then use it to sell you a lifestyle, a belief system, or a $8800 DNA test that will help you live forever.

Science isn’t a single study or a social media video. It’s messy, complex, and beautifully nuanced. And while it’s tempting to believe there’s a magical diet that makes us sunproof, the truth is a little more boring—and a lot more reliable.

So, until someone invents SPF steak, go easy on the fat, enjoy a balanced diet, and for the love of melanin: wear the damn sunscreen.


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Sophie Tseng Pellar recently graduated from 91˿Ƶ with a Bachelor of Science (BSc) degree in the physiology program. She is continuing her graduate studies in the surgical and interventional sciences program at 91˿Ƶ. Her research interests include exercise physiology, biomechanics and sports nutrition.

Part of the OSS mandate is to foster science communication and critical thinking in our students and the public. We hope you enjoy these pieces from our Student Contributors and welcome any feedback you may have!

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