How Chronic Stress Impacts Your Metabolism — and What Restores It
Metabolic Health Series | Issue 09
Most people understand, at least abstractly, that stress affects their health. What they're rarely told is how precisely — how chronic stress raises blood sugar, drives visceral fat, suppresses muscle metabolism, disrupts sleep, and eventually breaks the very system designed to manage it.
This isn't about feeling overwhelmed. It's about physiology. And reframing it that way changes everything — because what is physiological is also addressable. The body that stress has dysregulated is the same body that knows how to come back into balance. It just needs the right conditions.
The Stress System Was Never Designed for This
The HPA axis — the hypothalamic-pituitary-adrenal system — is the body's central stress response architecture. When the brain perceives a threat, it signals the adrenal glands to release cortisol and adrenaline. Heart rate rises, blood pressure climbs, glucose floods the bloodstream, digestion shuts down. It is an elegant, life-saving system.
The problem is that it evolved for acute, physical threats — a predator, a fall, a fight. It was not designed for the chronic, low-grade, inescapable stressors of modern life: financial pressure, relentless work demands, relationship conflict, social media, inflammatory news cycles, loneliness, and the accumulated weight of a life lived without adequate recovery.
When stress is acute, cortisol rises and falls cleanly. The system resolves. When stress is chronic, cortisol remains persistently elevated — not dramatically, but relentlessly. And that persistence is where metabolic damage accumulates.
Sara Szal, MD (formerly Gottfried)— Harvard-trained physician-scientist and author of The Hormone Cure — describes cortisol as the body's "control system hormone." When it's dysregulated, she says, it functions like a bully: "When cortisol is off, it throws off your estrogen and your thyroid. You're designed to make cortisol at all costs — at the expense of every other hormone." In her clinical experience, 91% of the women in her practice were struggling with dysregulated cortisol. That number says everything about how pervasive the modern stress burden has become.
What Cortisol Does to Your Metabolism
Chronically elevated cortisol produces a cascade of consequences that touch nearly every metabolic marker covered in this series:
It raises blood sugar deliberately. Cortisol stimulates the liver to produce glucose and makes tissues less responsive to insulin — ensuring energy is available for a perceived threat. When this happens chronically, it creates the same insulin resistance as a poor diet, independent of what you eat.
It drives visceral fat storage. Visceral fat cells contain a high density of cortisol receptors. Chronically elevated cortisol preferentially drives fat into deep abdominal storage — the metabolically dangerous depot discussed in Issue 4. This is why significant life stress is so often followed by weight gain concentrated in the midsection, with no change in diet.
It breaks down muscle. Cortisol is catabolic — it breaks tissue down. Chronically elevated cortisol gradually erodes skeletal muscle mass, shrinking the metabolic buffer that muscle provides.
It disrupts sleep. Cortisol and melatonin operate on opposing rhythms. Chronic stress keeps cortisol elevated into evening hours, interfering with sleep onset and deep sleep quality — which then worsens insulin sensitivity, which further elevates cortisol. A loop that can persist for years without deliberate interruption.
It dysregulates appetite. Chronic stress alters ghrelin and leptin in the same direction as sleep deprivation — increasing hunger, reducing satiety, and creating specific cravings for high-calorie, high-carbohydrate foods. This is not weakness. It is hardwired biology.
The Emotional Is Physical
The body does not distinguish between emotional stress and physical stress. (this bears repeating — say it out loud!)
The same HPA axis activation, the same cortisol release, and the same metabolic consequences occur whether the stressor is a genuine emergency or a catastrophic thought about something that hasn't happened yet. Rumination, worry, anxiety, unresolved tension, background dread — these are not merely psychological experiences. They are metabolic events, producing measurable changes in cortisol, blood sugar, insulin, and inflammatory markers.
This also means that the most powerful interventions for metabolic stress recovery are not purely dietary or exercise-based. They require working with the nervous system — and with the body — directly.
The Nervous System Needs a Different Kind of Support
The autonomic nervous system has two primary modes: sympathetic (fight-or-flight) and parasympathetic (rest-and-digest). Chronic stress locks the system in sympathetic dominance — a state in which cortisol is elevated, digestion is impaired, inflammation is high, blood sugar is dysregulated, and fat burning is suppressed.
Shifting out of that state requires physiological support the nervous system can respond to — not more effort, not more discipline, but a fundamentally different kind of attention.
Breathwork. Breathing is the only autonomic function under voluntary control — which makes it the most accessible lever on the nervous system available to anyone, at any time, without equipment. Slow, extended exhalation activates the vagus nerve and triggers parasympathetic tone within seconds. A meta-analysis of randomized controlled trials confirmed that breathwork significantly reduces cortisol and improves heart rate variability — a key marker of autonomic resilience. A simple protocol: inhale for four counts, exhale for eight. Five rounds. This is a physiological intervention, not a metaphor for relaxation.
Somatic movement — like the Non-Linear Movement Method (NLMM). Developed by Michaela Boehm and one of the core practices I'm trained and certified in, NLMM is a body-based approach to nervous system regulation that works through movement rather than the thinking mind. It is fluid, internally tracked, and non-choreographed — meaning there's no right or one way to do it, only your body's own way. The practice invites you to follow sensation rather than instruction, to move what has been held still, and to access what the body knows before the mind catches up.
The science behind why this works: when the body is stuck in chronic stress, the nervous system learns to brace — to hold, contract, and disconnect from sensation as a protective strategy. Over time, this disconnection from the body's own signals becomes its own stressor. Somatic practices like NLMM work by reversing that pattern — not through analysis, but through allowing movement to complete and discharge what stress has interrupted. What emerges, often surprisingly, is not just regulation but aliveness: a felt sense of inhabiting yourself more fully.
This is why I teach NLMM as a nervous system practice, not simply a movement practice. The goal isn't a particular physical outcome. It's a return to somatic intelligence — the body's intuitive, quieter knowing — and the joy and aliveness we can access when the nervous system finally feels safe enough to let go.
Nature exposure. Research published in Frontiers in Psychology found that just 20 minutes in a natural setting reduces cortisol by 21%, independent of exercise. Japanese research on shinrin-yoku (forest bathing) has documented cortisol reductions lasting seven or more days following a single immersive nature experience. This is hard biology, not soft lifestyle advice.
Social connection. Perceived isolation elevates cortisol and inflammatory markers at levels comparable to other chronic stressors. Warm social bonds trigger oxytocin release, which directly counteracts cortisol and promotes parasympathetic tone. The quality of your relationships is a metabolic variable.
Adaptogens. Botanicals — particularly ashwagandha and rhodiola — have evidence supporting their ability to modulate the HPA axis and reduce cortisol in people with elevated baseline levels. Incorporating adaptogens as a second-line tool can be helpful, after lifestyle and somatic foundations are in place. Most useful when cortisol is measurably elevated and lifestyle changes alone have not been sufficient.
The Feedback Loop — and How to Break It
Chronic stress and metabolic dysfunction are mutually reinforcing. Elevated blood sugar, poor sleep, visceral fat accumulation, and inflammation all activate the HPA axis — producing more cortisol, which worsens all of the above.
Breaking this loop requires addressing both ends simultaneously. Improving sleep reduces cortisol. Reducing refined carbohydrates stabilizes blood sugar and lowers the physiological stress of blood sugar dysregulation. Building muscle creates metabolic resilience. Regular breathwork, somatic practice, and time in nature give the HPA axis genuine windows of recovery.
An integrative approach emphasizes that stress management is not supplementary to metabolic treatment. It is metabolic treatment.
And from a somatic perspective: the body that has been living under chronic stress is not broken. It has been protecting you, the best way it knows how. The invitation — through movement, breath, and deliberate rest — is simply to let it know that the threat has passed. That it's safe to come home.
Knowing Your Pattern
Cortisol dysregulation doesn't always look the same. Two primary patterns:
High cortisol — the wired, anxious pattern. Difficulty unwinding in the evening, waking between 2–4am, belly weight gain, irritability, elevated blood pressure, difficulty recovering from exercise.
Low cortisol — the burned-out pattern that often follows years of chronic high cortisol. Profound morning fatigue, reliance on caffeine to function, emotional flatness, immune vulnerability.
Both impair metabolic health but require different interventions. Diurnal salivary or dried urine cortisol testing — which captures the full cortisol curve across the day rather than a single blood draw — is the most informative diagnostic tool and worth requesting if either pattern resonates.
Three Things to Do This Week
Begin a daily breathwork practice — five minutes, before you reach for your phone. Inhale for four counts, exhale for eight. Five rounds, every morning. Do it for seven days and notice your baseline stress reactivity. You are not just relaxing — you are retraining your autonomic nervous system.
Spend 20 minutes outside in a natural setting — not as exercise, just as presence. Sit near water, walk among trees, stand in a garden. Leave the phone in your pocket. You are running a cortisol reduction protocol.
Try one somatic check-in this week. Set a timer for five minutes, close your eyes, and simply move what you are feeling — without trying to change it. Where is there tension? Where is there ease? Where the body holding — can you allow movement to release it?You don't need to fix anything. Somatic intelligence begins with listening. That alone is a nervous system intervention.
Next issue: "Your Brain on Metabolic Dysfunction" — Lisa Mosconi's research on brain metabolism, the insulin-Alzheimer's connection, and what neuroprotective nutrition actually looks like in practice.
This newsletter is educational and does not constitute medical advice.
Lisa Marlene Thompson is a Functional Nutritional Therapy Practitioner, somatic facilitator, and health and lifestyle guide for anyone ready to feel more alive in their body. With advanced certifications in menopause science with Dr. Stacy Sims, somatic movement with Michaela Boehm, and sleep and brain health informed by the research of Lisa Mosconi and Matt Walker, her work sits at the intersection of cutting-edge science and deep body wisdom.
Her signature program — Strength, Sleep & Sensuality — is an invitation to come home to your body: to build real strength, reclaim restorative sleep, and rediscover a nervous system that is grounded and provides aliveness in the body that belongs to this chapter of life. She is based in Los Angeles and works with clients worldwide.
Your most vibrant chapter is still ahead.
I'd love to explore what's possible together → Reach out: lisa@lisamarlenethompson.com