10/08/2026
Light just won a Nobel Prize in Medicine. And I couldn’t be more excited to see this recognition.
The 2026 Nobel Prize in Physiology or Medicine was awarded to Peter Hegemann, Georg Nagel and Karl Deisseroth for discoveries that led to optogenetics, a technique that allows researchers to control the activity of nerve cells using light.
Here’s what they actually did.
It started with tiny algae that could swim towards light. Scientists discovered a protein called channelrhodopsin that responds to blue light by opening a channel in the cell membrane, allowing electrically charged particles to move through it.
They then introduced the gene for this protein into nerve cells.
When they exposed those cells to blue light, the neurons fired.
Think about that. Light could be used to trigger an electrical response in a living cell.
This discovery has transformed neuroscience, allowing researchers to investigate how brain circuits influence memory, emotions, movement and behaviour. It’s also opening possibilities for new therapies, including approaches to restoring vision.
Now, an important distinction: the researchers genetically engineered these nerve cells to respond to light. This isn’t the same as exposing ourselves to sunlight.
But the bigger conversation is one I’ve become increasingly passionate about as a physician.
Our biology doesn’t operate through chemistry alone.
We are responsive to light, temperature, timing and other physical signals from our environment. We already know that natural light plays an essential role in our circadian rhythms, sleep, hormonal signalling and so much more.
This is part of what draws me to quantum biology: exploring how physics contributes to the extraordinary complexity of living systems.
The Nobel Prize isn’t proof of every quantum biology hypothesis. But it is a wonderful reminder of how much we can discover when we bring physics and biology together.
Perhaps medicine’s next breakthroughs will come from broadening the way we look at the human body.
And perhaps nature still has a great deal to teach us.
I’d love to see these conversations become much more mainstream.