Four Hidden Health Risks Linked to Spending Too Much Time Indoors, Doctor Warns
A physician highlights the detrimental effects of modern indoor lifestyles and suggests simple outdoor remedies.
A significant portion of the population spends a minimal amount of time outdoors each week, contributing to a range of health issues, according to Dr. John La Puma, a physician and expert in nature-based medicine. A national survey by the Nature & Health Alliance, with researchers from Texas A&M University, found that nearly half of Americans spend less than two hours outdoors weekly.
La Puma, author of “Indoor Epidemic,” states that humans spend approximately 93% of their lives inside, leading to a "hidden health tax." He proposes a straightforward solution: a "7% outdoor prescription."
"Many people don’t realize that they’re inhibited from feeling as good as they can, because they’re exhausted even after a full night’s sleep," La Puma told Fox News Digital. "They need coffee to feel normal. They crash at 2 in the afternoon. They’re wired at night. They can’t go to sleep, but their labs are normal."
He identifies four key health problems, termed the "4 Bs," that are exacerbated by excessive indoor time: bad sleep, burnout, brain fog, and belly fat.
Bad Sleep
Outdoor light plays a crucial role in regulating the body's internal clock, or circadian rhythm. La Puma explains that the intensity of natural light helps set the body's schedule, which is disrupted by prolonged indoor exposure. Without a properly set body clock, sleep patterns become irregular.
Exposure to bright outdoor light soon after waking can synchronize the sleep-wake cycle and promote natural melatonin production later in the day. La Puma recommends spending about 10 minutes outdoors within the first hour of waking, without sunglasses, to help establish this rhythm.
Burnout
La Puma describes excessive time spent on screens and digital distractions as "ultraprocessed time," likening it to consuming non-nutritious, artificial food. This constant engagement can lead to a feeling of time evaporating and contribute to burnout, which he suggests is not solely a matter of willpower but can be influenced by one's environment.
The lack of a distant horizon when indoors can also be a factor. La Puma advises looking out a window for a minute each hour to relax the eyes, reduce headaches, and improve energy levels. He suggests that even brief excursions outdoors during the workday can help reverse burnout, emphasizing that "your eyes need distance like your lungs need air."
Brain Fog
Spending extended periods indoors, especially in poorly ventilated spaces, can lead to elevated carbon dioxide levels. Research has linked higher CO₂ concentrations to reduced cognitive performance, a phenomenon La Puma attributes to biological reasons rather than poor decision-making.
He notes that cross-ventilation can be difficult in indoor settings. Getting outdoors allows the eyes to focus at a distance and provides a break from potentially stale indoor air, where pollutant concentrations can be significantly higher than outdoors, according to the EPA.
Belly Fat
Disruptions to the body's natural cortisol rhythm, often caused by a desynchronized body clock, can be linked to increased abdominal and visceral fat. Cortisol, the stress hormone, typically follows a daily cycle that can be thrown off by insufficient daylight exposure.
La Puma recommends seeking daylight, particularly in the morning, to help regulate metabolism and cortisol levels. This early exposure can provide a beneficial boost in cortisol to promote wakefulness, followed by an appropriate drop later in the day.
The 17-Minute Dose
La Puma distinguishes between "incidental time" spent outdoors, such as walking from a car to an office, and "biologically active time." To counteract the "4 Bs," he suggests a minimum effective dose of 17 minutes of intentional outdoor time per day, preferably in a natural setting.
"Be intentional with your time — look at the sky in the morning … to reset your body clock and watch the clouds," he advised. For those in urban environments, looking at a distant rooftop or through an open window can serve as a substitute if direct outdoor access is limited. "So 17 minutes a day is the minimum effective dose — that’s all it takes to begin to bend the curve on the four Bs," he concluded. "You can turn those minutes into medicine."