Red Light

This is going to sound dumb, but light is important.

I am aware of how that sentence reads. We have spent the last thirty years treating light as an interior design problem — pick a bulb, pick a color temperature, dim it for the dinner party — and the entire health industry has happily ignored the fact that the species evolved under one specific light source for two million years and now lives, almost exclusively, under a different one. The new one is missing things the body needs and full of things the body did not evolve to handle. The body has noticed. The body is, as usual, the last thing anyone consults.

We were better off with the old incandescent bulbs. They were inefficient, they ran hot, they cost a few dollars more a year on the power bill, and they were also, by accident, the closest thing to firelight humans had ever piped into their homes — full-spectrum, heavy in red and infrared, with the blue dialed down where it belongs. We swapped them out for LEDs because LEDs were cheaper to run, and now we live inside a light spectrum that resembles nothing in nature. Then, to paper over the problem, the industry invented a new metric — CRI, the Color Rendering Index — to grade how natural the unnatural light is. The fact that we needed a grading system at all was the warning. We ignored it.

The LED problem

LED bulbs are heavy in blue, light in red, and emit essentially zero infrared. That is the inverse of sunlight, the inverse of firelight, and the inverse of every light source any human ever lived under before about 2010. There is a small irony in this — the blue LED was so hard to invent that the team who finally cracked it won the Nobel Prize in physics — and the reward for that achievement was a globe full of people who now spend sixteen hours a day staring into the precise wavelength most disruptive to their circadian rhythm. We solved a beautiful physics problem and then deployed the solution like an aerosol over the entire civilian population.

Blue light at night tells the brain it is morning. Melatonin gets suppressed, sleep gets shallower, recovery gets worse, and every downstream system that needs sleep — hormones, immune function, glucose regulation, mood, the whole list — pays the bill. Meanwhile, the red and near-infrared wavelengths that the mitochondria in your cells actually use as a metabolic signal are missing entirely from the light you live in. You are getting the part that hurts and not the part that heals.

We evolved in the sun

We are not cave creatures. We are not office creatures. We evolved on an open savanna under a star, and our skin, our eyes, our pineal gland, and the mitochondria in every cell of our body were tuned, slowly and over millions of years, to the spectrum that star emits. Sun on skin is not a cosmetic event. It is a metabolic and hormonal event. Vitamin D is the famous example but it is not the only one — nitric oxide is released from the skin under sunlight, blood pressure drops, mood lifts, the circadian system locks in, and the mitochondria get the red and infrared dose they need to run efficiently for the rest of the day.

The ideal protocol, frankly, is to be naked in the sun. Caveman-style. Not for hours, not at midday in July, not in a way that burns — but enough, often, with enough skin exposed, to receive the signal the body has been built around since before we were modern humans. Most modern adults have not done this on purpose in years. Then they wonder why they feel like shit.

The next best thing is to expose as much skin as the climate and the law allow. I wear a tank top and shorts year-round. I shovel the fucking driveway in flip flops in the snow, like an iceman who came to shovel snow and giggle, and I am not doing it as a stunt. I am doing it because skin in light, skin in cold, and skin in air are signals my body wants and my body responds to. The neighbors think I am crazy. The neighbors are also tired all the time, and I am not.

Red light therapy is the stupidest-feeling thing that works

When you cannot get the sun — and most of the year, in most of the country, you cannot get enough of the right kind of sun — the closest available substitute is red light therapy. You stand in front of a panel that emits red and near-infrared light, usually around 660 nanometers and 850 nanometers, for ten to twenty minutes. That is the entire intervention. It looks ridiculous. It feels ridiculous. There is nothing happening on the surface of your skin that you can perceive. You are standing in front of a glowing rectangle, in your underwear, doing nothing. We are not plants. There is no obvious reason this should do anything.

It does something. The mitochondria in your cells contain an enzyme called cytochrome c oxidase that absorbs exactly those wavelengths, and when it absorbs them, ATP production goes up, inflammation comes down, and the cell runs better for hours afterward. The photobiomodulation literature is now large and growing — wound healing, joint pain, skin quality, post-exercise recovery, cognitive performance, mood — and the underlying mechanism is consistent across all of it. You are giving the mitochondria a wavelength they evolved to use, and they use it. The body does the rest.

For Effie this is not a small effect. Her hands feel dramatically better with regular red light exposure. Combined with the primal diet — animal fat, real meat, no seed oil noise drowning out the signal — the red light dose is part of how we have been clawing back ancestral function in a body the standard playbook had given up on. It is not magic. It is the body doing what the body does when you stop blocking the inputs and start providing them.

Make it a priority

This is one of the cheaper, easier, more available interventions you can add to a serious health stack, and it is also one of the most ignored, because it sounds and feels entirely fucking stupid. Get over that. The mitochondria do not care about your dignity.

Order of operations:

Get more sun. Skin out, midday when feasible, often. Build up gradually, do not burn. Once your lipid envelope is clean (see the fat essay) you will be able to take more sun before you burn anyway.

Replace the worst LED bulbs in your house. Especially the bedroom, the bathroom, and the kitchen at night. There are now bulbs on the market that mimic incandescent spectrum honestly — full-spectrum, low-blue, some with infrared. They cost more. They are worth more. The light you stand in for sixteen hours a day is not the place to optimize for the lowest sticker price.

Add a red light panel. Ten to twenty minutes, three to five times a week, on bare skin, at close range. It feels ridiculous. Do it anyway. The dose builds up.

If you want to be hardcore, add blue light blockers for the evening. Effie wears them after sundown. Amber or red lenses, the orange kind that make you look unhinged in family photos. They block the wavelengths that suppress melatonin, and they are the cheapest sleep upgrade on the market. The kids will laugh. The kids are not the ones trying to repair a nervous system at fifty.

The body was built for light. The wrong light hurts it, the right light feeds it, and we have spent thirty years pumping the wrong light into our homes while charging premium prices for the right kind. Fix the light. The light will, in turn, fix you.