In this solo YouTube monologue, the creator recounts a self‑experiment in which he ate roughly 1,000 sardines over a month, dramatically raising his dietary omega‑3 intake. He reports an unexpected physiological change: marked cold resistance, allowing him to endure icy Boston weather shirtless. To explain this, he dives into scientific literature, focusing on a 2019 Cell Metabolism paper that identified a pathway where brown (and beige) fat converts long‑chain omega‑3 fatty acids, especially EPA, into the hormone 12‑HEPE via the enzyme 12‑lipoxygenase (12‑LOX). 12‑HEPE acts as a batokine, stimulating thermogenesis in brown fat, increasing glucose uptake into brown fat and muscle, and promoting overall heat production and metabolic health. He outlines mouse experiments showing cold exposure raises 12‑HEPE, and a blinded human trial where a pathway‑activating drug (instead of cold) raised 12‑HEPE and brown‑fat glucose uptake. He also notes epidemiological data linking higher 12‑HEPE levels with lower BMI and better insulin sensitivity, suggesting a deficit of this pathway in obesity. The speaker then offers practical advice: consume at least 2 g of combined EPA + DHA daily from fatty fish or supplements, and consider supplement forms that enhance brain delivery (lysophosphatidylcholine DHA, “lysodHA”). He promotes a specific product, Accentrate Omega Max, with a discount code. Throughout, he frames food as informational input that can reprogram hormonal signaling and metabolic pathways, using his sardine diet as a vivid illustration.
Chapters
This was so weird. Okay, so I recently did a rather radical dietary experiment and something totally unexpected happened. I became cold resistant. I'm cold resistant. Like, I could take my shirt off in an icy Boston winter and I felt totally comfortable. Blasts of frigid air felt almost like a cool summer's breeze. Now, I promise I'm gonna tell you what I did to have this effect, but first I want to share with you the idea behind it, why this makes sense at a high level. The food we eat, it's not just fuel, it's the raw material our bodies use to make hormones. So when you change your diet, you change your hormones, including the ones that tell your body to take stored energy and turn it into heat, revving up your metabolism. And in my case, I accidentally turned my mitochondria into the thermogenic beast mode. It was like flipping a switch. It felt weird. It was unexpected. But as you'll see, it also makes total sense. Let me prove it to you. I became conspicuously cold resistant. That metabolically active brown fat— these are secret superpowered hormones caught in a loop of metabolic dysfunction. This is a lens through which to reframe obesity. Activating this pathway in humans drove a metabolic shift. What we eat isn't just fuel, it's information for our bodies. How the right nutrients can unlock ancient pathways hidden in our bodies. Okay, so here's the deal. I recently did a self-experiment that can be summed up in two words: sardine diet. If you haven't seen that video yet, feel free to check it out. I ate 1,000 sardines in a month. But here's what you need to know. Basically, I ate sardines as the base of my diet, consuming 1,000 sardines in a month. And as a quick aside, my girlfriend hated it. You smell like fish, like you smell like you're sweating the smell. Anyway, we persisted. Thank you, girlfriend. I'm not gonna name her. Anyway, I wanted to see what would happen if I just jacked up the omega-3 fats in my body like those found in fatty fish like sardines. It worked, first of all. My blood omega-3 levels went so high they broke the human scale, and the composition of my fatty acids in my blood became more dolphin than actual human. Anyway, after a couple weeks on this extremely high omega-3 sardine diet, I became conspicuously cold resistant. So even in a Boston winter with naked trees and biting wind, I found myself walking outside happily shirtless. This is one of the more unexpected effects of this sardine fast. I'm cold resistant. I just haven't been getting cold, especially outside. Now, there's some literature on omega-3s increasing thermogenesis under cold stress, so I'm not sure if that's what's up. I don't know if this is a placebo, but it's really weird. It felt refreshing when it should have felt frigid. It was very weird, and I wanted to understand what might be happening. So I dug into the literature, I went down the PubMed rabbit hole, and eventually found a fascinating 2019 Cell Metabolism paper. So at a high level, here's what this study showed: that metabolically active brown fat—maybe you've heard of it, I'll describe it in a moment—can convert omega-3 fatty acids like those found in sardines into a hormone called 12-HEPE. Now if you haven't heard of brown fat before, it's a specialized organ that makes heat. And despite its name fat, it's actually derived from the same precursor cells as skeletal muscle cells, so in a way it's more related to muscle than fat in terms of its family tree. And like muscle, it burns a ton of energy, but specifically it generates heat. Now, adult humans have some brown fat, although not a ton, but we can also convert normal white fat, storage fat, into a brown fat-like state called beige fat. Anyway, getting back on track, omega-3s can be converted into this hormone, 12-HEPE, in brown fat, and in turn this hormone stimulates thermogenesis, heat production, and it ramps up glucose intake into brown fat, where it's burned for heat, and muscle rather than regular white storage fat. You following? Now let me walk you through some of the data so you don't have to just take my word for it, and I can show you how I connect the dots between PubMed and my personal experience. So, the researchers behind this study, they wanted to move past this oversimplified narrative that brown fat's benefits are to just produce heat and burn calories. Instead, they viewed brown fat for what it is. It's an endocrine organ, meaning it produces hormones just like your thyroid gland or your adrenal glands. In fact, brown fat hormones have a special name. They're called "batokines" for brown fat. These are secret superpowered hormones. So if you want a sticky analogy, just think Gotham has Batman and metabolism has batokines. People need dramatic examples. I ate 1,000 sardines in a month. Maybe that was too much. Anyway, what do these hormones do and how do they work? Well, to begin answering that question, the researchers started with mouse models. And yes, there will be human data, controlled human data. We'll get to that, I promise. But I want to start with animal studies for mechanism. So, they took mice and they exposed them to different temperatures: cold temperature, 5°C, or thermoneutrality, so kind of like room temperature. And after the cold exposure, researchers measured changes in circulating blood metabolites, and several stood out. But one that stood out in particular was this 12-HEPE that I mentioned earlier, which is synthesized by the enzyme— sorry, there's a lot of jargon— 12-lipoxygenase, or 12-LOX for short. So, there's a lot of abbreviations, let's clarify and summarize. Omega-3 are fats that are found in sardines and other fatty fish that can be converted by the enzyme in brown fat, 12-LOX, into a hormone called 12-HEPE. Make sense so far? Further experiments showed the cascade, the signaling cascade, basically cold exposure activates beta-adrenergic signaling in the nervous system. And this triggers the activation of this 12-LOX enzyme in brown fat and also increases its gene expression over the longer term, amplifying the effect. Then the enzyme, the 12-LOX, turns omega-3, in particular EPA if you want that nuance note, into the 12-HEPE hormone. This 12-HEPE hormone is then secreted from brown fat and can act back on brown fat and muscle tissue to increase their relative metabolisms. So you're revving up the brown fat, increasing thermogenesis heat production while also boosting muscle metabolism. Ultimately, this promotes cold adaptation, thermogenesis, and improves overall glucose metabolism. Hopefully that makes sense. But now on to the human data. The researchers also conducted a randomized placebo-controlled trial. They wanted to test whether activation of this cold-activated pathway could be triggered in people, but without putting people in freezing environments. So what they did is they used a medication that activates the same pathway. What this did is it allowed for blinding. Since you can't easily blind someone to cold, they gave them this medication or a placebo. The results were compelling. Activation of this pathway, this cold-relevant pathway, increased 12-HEPE levels significantly in people. And here's the best part. Using labeled glucose, radiolabeled glucose, the researchers could track where it goes, and they found a large increase in glucose uptake in brown fat. So in other words, activating this pathway in humans drove a metabolic shift towards brown fat activation, thermogenesis, and glucose burning, just like in the mice. So to summarize once again, cuz I really want you to get the big point: cold exposure or mimicking it chemically activates brown fat. Brown fat in turn converts omega-3s into this hormone 12-HEPE. That hormone then activates heat production in brown fat and pulls glucose into muscles and brown fat instead of storing it in normal white fat. This means more energy used, less is stored, heat is produced, and you cold adapt. The metabolic activity is shifting towards heat production and muscle metabolism. And connecting the dots to my personal experience on the Sardine Diet, the high omega-3 diet, you might even become cold resistant. But with that said, I want to be clear, I'm stretching here a little bit. The data from the study did not directly show that very high omega-3 intake can force an increase in 12-HEPE production. So this is a case where I'm transparently speculating on what I experienced as a person and conceptually connecting it with data that I could find. Consider it a personal extrapolation based on my own experience and basic science. But with that, back to the data. The researchers also analyzed human data to find an association between 12-HEPE levels and body mass index, a rough marker for obesity. People who were lean and also insulin sensitive had higher levels of 12-HEPE, and those that were overweight or insulin resistant actually had lower levels, so this suggests a novel metabolic disadvantage in obesity, a reduced ability in obesity to activate this omega-3-based thermogenic pathway. This is really cool because this is a lens through which to reframe obesity. Obesity is not simply a consequence, an aesthetic punishment for poor lifestyle choices, it's about disrupted signaling. It's about a body caught in a loop of metabolic dysfunction, one that diet can unwind, but only when the inputs are right. And locked in. Now, I'll provide more data and context in the associated newsletter as well as other articles on this topic linked below, but for the sake of time, let me now transition, let me pivot to giving you some hopefully actionable information. Try to consume a diet rich in omega-3 fats, in particular the long-chain omega-3s EPA and DHA that are found in fatty fish, like the SMASH fish: sardines, mackerel, anchovies, salmon, and herring. Aim for at least 2 grams of EPA and DHA combined daily, which can come from fish and/or supplementation. Now with that said, omega-3 supplementation is actually a really tricky business, so let me take a moment to discuss it in a little more nuance. One added nuance is that it's not just about the dose of omega-3 you take, it's also about the form they're in. Standard omega-3 supplements include large amounts of triglyceride form omega-3s. Which will increase your blood levels but actually get preferentially driven into fat tissue and not necessarily brown fat, and they have trouble crossing the blood-brain barrier into the brain. So if brain health and cognition are top priorities for you, as they are for me, you may want a form that is more blood-brain barrier penetrant. Specifically, the form you want is called lysodHA for lysophosphatidylcholine DHA, which is like the express courier of this DHA omega-3 into the brain. It helps to get into the brain through a specialized transporter called MSFD2A, although you don't need to know that detail. But this can help support cognition and healthy brain aging. Now, if you're interested in trying the product that I use, it's called Accentrate Omega Max from Phoenix Health, you can check out the link below and use a discount code STAYCURIOUS for 20% off. And I've also included below a detailed breakdown of the science, how this works, and what sets this omega-3 supplement apart. So you'll see, hopefully, this isn't just a shallow product pitch. I want you to understand the full rationale behind why I choose to take this product, and then you can decide for yourself if it makes sense for you to take. But with that, let's step back and look at the big picture from what we've learned. What we eat isn't just fuel, it's information for our bodies. It shifts our hormones and tinkers with our metabolic source code. For example, if your diet optimizes omega-3 intake and minimizes excessive intake of omega-6 fats from highly processed industrialized oils, you may shift your body's hormonal milieu, hormonal cocktail, towards the production of more beneficial compounds. So, in closing, what started as a weird dietary experiment turned into a window into something much bigger: the reminder that food, real, specific, molecularly active food, can reprogram our bodies and how they interact with the environment. I didn't expect to become cold-resistant, but I'm convinced it was more than a fluke. So this is about much more than sardines. It's about how the right nutrients can unlock ancient pathways hidden in our bodies, in our fat, in our muscles, in all our cells, just waiting to be activated by the right trigger. So in a world obsessed with calories, maybe the real question is not how much we eat, but what messages we we're sending to our body. Stay curious. Thanks.
