At the age of 40, neurosurgeon Joseph Maroon seemed to be at the peak of his career. However, in a heartbreaking week, his 60-year-old father passed away, his marriage fell apart, and severe burnout forced him away from the operating room.
Maroon shared on EpochTV’s program “Vital Signs” how he went from performing “awake craniotomies” for patients with brain tumors to working at a rundown truck stop that his father had left to his mother but had already mortgaged. He found himself asking, “How did I end up in this situation?” while flipping burgers and refueling heavy trucks every day.
Struggling with overweight, low mood, and even finding stairs challenging, Maroon hit rock bottom in his life. However, his eventual recovery not only reshaped his health but also altered his understanding of the relationship between mind and body.
The turning point came with an invitation from a banker – the same banker who held the mortgage for the truck stop. He encouraged Maroon to go running with him.
Despite his physical struggles, Maroon agreed. He recalled, “We ran four laps around the track. I said, ‘I’m never doing this again.’ But that night, I slept well for the first time in months.”
The next day, he went again. Gradually, he began running further. After learning about triathlons and cross-training, he bought a bike, learned swimming, and integrated exercise into his daily life.
As his body grew stronger, Maroon noticed changes in his sleep, mood, memory, and cognitive abilities.
Maroon said, “I was essentially rebooting my neurotransmitter system. My serotonin levels rose, acetylcholine improved – my memory sharpened naturally, without any medications.”
In less than a year, he shed excess weight, regained mental clarity, and completely adjusted his diet and daily habits.
While the biological effects of exercise are more complex than mere changes in neurotransmitters, research confirms the positive effects of exercise on mental health.
A 2024 systematic review analyzed 218 randomized trials involving over 14,000 participants, finding that activities such as walking or jogging, strength training, yoga, and other forms of exercise can alleviate symptoms of depression. Exercise may work through various pathways, including stress regulation, neural plasticity, inflammation response, and neurotransmitter signaling.
For Maroon, this experience revealed a principle that would guide the rest of his life.
He said, “We know that psychological issues can lead to serious physical discomfort – such as heart attacks, strokes, irritable bowel syndrome, but the body can also heal the mind. Everything we do – whether it’s diet or exercise – is centered around brain health, mental health, and physical health.”
He firmly believes that achieving a “reboot” of the body through exercise (including aerobic exercise and resistance training) can serve as an effective self-repair mechanism, soothing restless minds and restoring body-mind balance.
Maroon defines “burnout” as “excessive work, excessive commitment, excessive stress – a state of imbalance.”
His experience is not unique. According to data from the American Medical Association in 2024, 43.2% of physicians working in the US healthcare system reported experiencing at least one symptom of burnout.
Burnout is not just ordinary fatigue. Prolonged stress activates the hypothalamic-pituitary-adrenal (HPA) axis in the body, increasing the secretion of hormones such as cortisol and adrenaline. In the short term, this response helps the body cope with challenges, but if this system remains activated for an extended period, it can disrupt sleep, emotional regulation, attention, and memory functions.
Maroon specifically focuses on the hippocampus – an area in the brain closely associated with learning and memory. Long-term stress is linked to changes in the function and structure of this region.
He said, “Without a healthy mind and brain, life becomes very complicated.”
Exercise helped Maroon break this vicious cycle, but his journey to recovery ultimately made him realize that exercise alone was not enough. Even with a strong body, a person could still be in a dangerous state of imbalance.
In his book “Square One: A Simple Guide to a Balanced Life,” Maroon introduces an intuitive practice for assessing the distribution of personal time and energy across different life domains.
Imagine four axes extending outward from the center of a square, each representing a major area of life: work, family, spiritual life, and physical health. Mark the axes based on the level of attention you devote to each area. Connecting these points forms a shape that visually reflects whether life is relatively balanced or dominated by one dimension.
The goal is not to evenly distribute time per hour. At different stages of life, certain responsibilities naturally require more attention. This practice aims to reveal if any critical aspect of life has been long neglected, leading to detrimental imbalances affecting other areas.
Reflecting on his breakdown experience, Maroon found that nearly every dimension of his life had been impacted.
He said, “When I was deep in burnout, the line representing work was flat like an EKG – no family, no spiritual life – it was a mess.”
Exercise gave him the energy and clarity to begin rebuilding his life, but physical improvement was just one side of the square comprising a “balanced life.” He also changed his dietary habits, reestablished his spiritual foundation, and reassessed his relationships and life focus.
He said, “The body is a sacred temple – you need to take care of it.” However, for him, caring for the body was not the ultimate goal; it laid the necessary foundation for deeper engagement in family, work, serving others, and spiritual life.
In his constructed model of health, Maroon emphasizes five practical cornerstones: consuming nutrient-rich foods, maintaining regular exercise, reducing exposure to harmful substances, managing stress effectively, and ensuring adequate sleep.
These habits complement each other. Exercise aids in improving sleep and stress regulation, while sleep helps the brain and muscles recover from physical activities. Nutrition provides the body with the nutrients needed to generate energy.
Maroon particularly emphasizes two ways in which nutrition impacts brain health: through the gut microbiome and the body’s antioxidant defense system.
To Maroon, the typical Western diet – filled with processed foods, hormone-treated meats, and sugary drinks – is a key factor leading to chronic inflammation and brain damage.
Maroon said, “A healthy gut is crucial for a healthy brain; a significant portion of our immune system resides in the gut.”
The gut microbiome (billions of bacteria in the gut) plays a crucial role in digestion, nutrient absorption, vitamin synthesis, and immune regulation. When this ecosystem becomes imbalanced (often due to poor diet), immune function can be compromised, and systemic inflammation may worsen.
He said, “If the gut microbiome is imbalanced, your immune system is either unhealthy or suppressed; you are more susceptible to infections and diseases.”
The latest research, including studies on Alzheimer’s and Parkinson’s diseases, suggests a link between gut dysbiosis and neurodegenerative changes, cognitive decline, and even depression. This imbalance can trigger neuroinflammation, oxidative stress, and “leaky gut,” allowing harmful substances to affect the brain through the gut-brain axis.
Maroon advocates for a diet that restores microbial balance and reduces inflammation, recommending consuming fiber-rich whole foods, fermented foods (like kefir yogurt), and probiotics to support gut health and overall brain function.
Maroon also highlights that oxidative stress is a significant driver of brain aging and neurodegenerative diseases. Oxidation is a normal aspect of cellular energy production but can generate unstable molecules known as “free radicals.” When these molecules outnumber the body’s capacity to neutralize them, they can damage mitochondria, DNA, and cell membranes.
One of the body’s main defense mechanisms is glutathione, a crucial antioxidant produced by cells.
Maroon said, “Glutathione is the ‘king of antioxidants’ in the brain.”
He compares the oxidation process in brain cells to the gradual browning of a sliced apple or peeled banana exposed to air. While these processes are not entirely the same, the analogy vividly illustrates how oxidative damage accumulates when the protective defense mechanism is overwhelmed.
Research finds that in brain regions affected by neurodegenerative diseases, levels of glutathione are reduced. In a 2023 study, researchers measured glutathione levels in 38 Parkinson’s patients and 30 healthy controls. Parkinson’s patients showed significantly lower glutathione levels in the substantia nigra (the movement center) and hippocampus (related to memory).
Maroon also participated in research proposing that oxidative stress and weakened glutathione defense may appear early in the onset of Alzheimer’s disease or coincide with more pronounced pathological changes, or even precede these changes.
These findings led to a small phase I pilot study for early-stage Parkinson’s patients. The trial is testing gamma-glutamylcysteine – a precursor substance in the synthesis of glutathione – to determine if it can increase glutathione levels in the brain and blood and if these changes are associated with improvements in movement or cognitive function.
As the trial is ongoing, it is unclear whether raising glutathione levels can improve Parkinson’s symptoms. However, for Maroon, this research reveals a broader principle: to protect the brain, early support for its intrinsic defense mechanisms is needed, rather than waiting until the disease progresses to take action.
Antioxidant defense is just one part of this strategy. Maroon always believes that exercise is one of the most convenient and feasible ways to maintain physical and mental health.
The best exercise is one that can be safely initiated and consistently maintained. Maroon’s path to recovery didn’t start with triathlons but from struggling to complete four laps on the track.
Maroon’s father passed away at the age of 60 when Maroon himself was 40. This loss forced him to confront the future of his health from midlife onwards.
From middle age, muscle mass and physical resilience may gradually decrease, and years of inadequate sleep, unbalanced diet, lack of exercise, and poorly managed stress may become increasingly challenging to ignore. However, these conditions are not set in stone. Regular exercise, adequate recovery, proper nutrition, meaningful relationships, and a sense of purpose can still influence people’s physical functions and life status as they age.
Interviewed at 85 years old, Maroon is notably still active in the field of neurosurgery.
He said, “I’m still operating, performing neurosurgery, and I’m more creative than I was in my sixties. I hope to die spiritedly – of course, the later, the better.”
Maroon’s experience demonstrates that recovery may begin with a simple physical movement within reach, but only when all aspects of life are rebalanced, can this recovery continue.
He said, “Give it your all, enjoy every day – feel the passion of life, and give back to society.”