Morning Light Is the Antidepressant We Keep Skipping
Outdoor light resets the circadian clock that SSRIs often leave broken.
Posted May 29, 2026 | Reviewed by Kaja Perina
Sarah, a 38-year-old paralegal, had been on 50 milligrams of sertraline for two years when she came to my office. Her depression had lifted, but her libido, her energy, and her sense of self had not fully returned. "I want off these drugs," she told me. "But every time I try, I feel worse than before I started." Sarah is not unique. One in six adults takes an SSRI. Most were started in a 12-minute visit. Almost none have been told how to stop. Health Secretary Robert F. Kennedy Jr. recently announced initiatives to help them: clinician training, a CMS code for deprescribing, and a Dear Colleague letter recommending nutrition , exercise, social connection, and psychotherapy as alternatives.
The Overlooked Alternative: Morning Light Exposure The Dear Colleague letter left out the alternative that addresses the biology underneath the diagnosis. That alternative is the dosed, timed exposure to outdoor light, especially in the morning. Roughly half the genes in the human body are switched on and off by an internal clock. That clock is set primarily by light hitting the back of the eye, and reinforced by when you move and eat. Disrupt the clock and you disrupt appetite , cortisol rhythm, social energy, and the brain circuits that drive rumination. PubMed returns more than 7,000 papers on circadian rhythms and depression. The Dear Colleague letter cited none of them. Depression is not one disease. One in four depressed patients has a circadian subtype with earlier onset, more severe symptoms, and a measurably poorer response to both SSRIs and SNRIs. These are the patients asking how to stop a medication that never fully worked. They have a known, free, scalable treatment. No one has told them, until now. Over prescription is just part of the problem. The rest of it is that the toolkit is missing the tool that has some of the best evidence, and the lowest cost in the literature. Clinical Trials Comparing Light Therapy and Antidepressants
In 2016, Raymond Lam and colleagues randomized adults with non-seasonal major depression to placebo , fluoxetine, bright light alone, or light plus fluoxetine. Light beat fluoxetine. The combination beat both. The number needed to treat for response in the combination arm was 2.4, better than most pharmaceuticals on the market for any condition. I have prescribed SSRIs and will continue to. For severe depression they save lives. The Lam trial showed that light plus drug beat either alone, which is the point. But pharmaceuticals are not as benign as the ads suggested. SSRIs more than triple the risk of sexual dysfunction. Roughly one in six patients have other significant side effects when stopping.
Most people have never heard of daytime before screen time as an alternative. Step outside within an hour of waking, before you touch your phone. Don’t wear sunglasses. Find a skyview, because the light is what the eye needs, not the scenery. The cells in the back of your eyes that help set the circadian clock care how much sky you can see. Stay at least 10 minutes. Repeat at lunch if you can. One exception: patients with bipolar disorder should consult a psychiatrist before dosing morning light, which can advance circadian phase fast enough to trigger mania . In winter, daytime before screentime still works. Outdoor light on a gray, rainy morning is still 10,000 lux or more, versus 300 lux in the brightest office. A doorway, a balcony, a fire escape, an open window, a bus stop, a covered porch all deliver the dose. No sunglasses or sitting near a closed window indoors or in a vehicle. The patient with seasonal depression in Buffalo does not need to move to Phoenix. She needs to step out the back door at 7 a.m. with her coffee and look up. If CMS will pay to taper antidepressants, it should pay to prescribe ten minutes of morning sky during that taper. Timing, duration, skyview, and frequency should be on the script the way prescriptions are written. If SAMHSA builds training modules this summer without basic chronobiology in them, the panel will produce the same gap that produced the Dear Colleague letter. 50 million Americans will keep being told the only door out is the door they came in through. For Sarah the prescription was specific. Coffee on the back step, not at the kitchen counter. Sky in her eyes within an hour of waking, before her phone. A walking lunch three days a week. We tapered the sertraline over four months. She is off it now. She is also outside, on purpose, every day. Sixteen percent of American adults are on a medication that, for many of them, will be hard to stop. Dosed, intentional, prescribed time outdoors belongs on the list of what works.It is past time we prescribed it.
La Puma, J. (2026). Prescribe Movement Outside. American Journal of Lifestyle Medicine 2024 Volume 19, Issue 1 https://doi.org/10.1177/15598276241265282
La Puma, J. (2026, March 17). Your employees aren't burned out. They're Indoors too much. Fast Company. 3/17/26 https://www.fastcompany.com/91507191/your-employees-arent-burned-out-theyre-indoors-too-much
Lam, R.W., Levitt, A.J., Levitan, R.D., Michalak, E.E., Cheung, A.H., Morehouse, R., Ramasubbu, R., Yatham, L.N., & Tam, E.M. (2016). Efficacy of bright light treatment, fluoxetine, and the combination in patients with nonseasonal major depressive disorder: A randomized clinical trial. JAMA Psychiatry, 73 (1), 56–63. https://doi.org/10.1001/jamapsychiatry.2015.2235
Roenneberg, T., & Merrow, M. (2016). The circadian clock and human health. Current Biology, 26 (10), R432–R443. https://doi.org/10.1016/j.cub.2016.04.011
Zhang R, Lahens NF, Ballance HI, Hughes ME, Hogenesch JB. A circadian gene expression atlas in mammals: Implications for biology and medicine. PNAS. 2014;111(45):16219–16224. doi:10.1073/pnas.1408886111
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John La Puma, M.D., is a board-certified internist, trained chef, two-time New York Times bestselling author, and a regenerative farmer who pioneered the culinary medicine movement.
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