Cortisol. It isn’t the enemy.

Your nervous system is not your enemy.

It’s your best friend, your oldest and most loyal protector. It has been keeping you alive since before you could speak.

It beats your heart, coordinates your breathing, monitors your internal environment, and prepares you to respond to change. Even anxiety, muscular tension, cravings, restlessness, or the urge to withdraw may represent attempts to protect you.

Sometimes it is an overprotective best friend.

It may tell you to:

Stay alert, don’ trust the situation
Don’t stop
Keep working
Something is wrong
Eat something quickly, we need energy

These responses are not character flaws. They are protective patterns. But protective patterns can become overly sensitive, outdated, or mismatched to what is happening in the present.

The goal is not to fight, silence, or “hack” your nervous system. It is to understand what it may be communicating and help it receive new, more accurate information.

These are the intricacies involved in your whole body response to stress in all shapes and forms, and how you can support it.

Understanding the Autonomic Nervous System

The autonomic nervous system is your body’s automatic control system—constantly adjusting your internal functions to help you respond, recover, and maintain balance.

It helps regulate things like:

• Heart rate and blood pressure
• Breathing patterns
• Digestion
• Sweating and temperature regulation
• Pupil size
• Bladder and sexual function
• Energy mobilisation

Aspects of immune and inflammatory activity It is commonly divided into three main branches:

1. Sympathetic nervous system “fight or flight”
Helps the body respond to stress, increasing alertness, heart rate, and energy availability.

2. Parasympathetic nervous system “rest and digest”
Supports relaxation, digestion, recovery, and energy conservation.

3. Enteric nervous system “gut brain”
Helps control digestion and the movement of food through the gastrointestinal tract. The sympathetic does not mean “bad”, and the parasympathetic does not mean “good”. Health is flexibility.

But can you activate when action is required and come back down when the challenge has passed?

The Brain Talks to the Body. The Body Talks Back

We often imagine that the brain is the boss and the body simply follows its instructions. In reality, communication travels in both directions.

Your body is continually sending information back to your brain about your heartbeat, breathing, blood pressure, digestion, hunger, fullness, inflammation and internal environment.

One of the major pathways involved in this communication is the vagus nerve.

The vagus travels from the brainstem and communicates with many important structures, including the throat, heart, lungs, oesophagus, stomach, liver, pancreas, and much of the intestinal tract.

Importantly, most vagal fibres carry sensory information from the body towards the brain, rather than simply delivering commands from the brain to the organs.

The vagus nerve does not directly communicate with every organ. Other autonomic nerves, the spinal cord, hormones, and signals travelling through the bloodstream are also involved.

But the central message remains fascinating:

Your body is not silent beneath your thoughts. It is continually informing how your brain interprets the moment.

The brain talks to the body. The body talks back. Regulation is the quality of that ongoing conversation.

The HPA Axis

Alongside the rapid communication of the autonomic nervous system is another stress-response system called the HPA axis.

HPA stands for hypothalamic-pituitary-adrenal axis, but you can think of it more simply as:

Brain → messenger → adrenal glands → cortisol

When your brain perceives a demand, the hypothalamus signals the pituitary gland. The pituitary then signals the adrenal glands, which release cortisol.

Cortisol helps make energy available so that you can respond.

We need cortisol to wake up, concentrate, exercise, mobilise glucose and deal with challenges. It also follows a natural daily rhythm.

The problem is not the existence of cortisol or the normal stress response. The problem is repeatedly calling upon these systems without providing adequate recovery.
It is also too simplistic to assume that chronic stress means cortisol is permanently high. Cortisol patterns may change in different ways depending on the individual, the nature of the stress, the time of day, and how long it has been occurring.

Your body may not be broken. It may be responding appropriately to the signals and demands it keeps receiving.

Understanding Somatics

‘Somatics’ means working with the body’s lived experience, not only thinking about how you feel but also noticing what is happening physically.

This includes:

• Interoception: sensing what is happening inside you, such as heartbeat, hunger, fullness, muscular tension, warmth, nausea, breath or fatigue.
• Proprioception: sensing where your body is in space and how you are holding yourself.
• Exteroception: noticing what is happening around you through sight, sound, touch, and your other senses.

Where do you experience stress first?

Is it in your jaw, chest, stomach or shoulders?
Do you hold your breath?
Do you speed up and start doing ten things simultaneously?

Do you become restless, reach for food or withdraw from other people? These sensations and behaviours are information.

Somatic awareness can help you notice the signal earlier—before the body has to shout to get your attention.

Where Polyvagal Theory Fits

Polyvagal theory offers a popular framework for understanding how people may move between connection, mobilisation and shutdown.

It describes:

• A connected or “ventral vagal” state
• Sympathetic mobilisation or fight-or-flight
• A proposed “dorsal vagal” immobilisation or shutdown state

The framework can be compassionate because it allows us to ask:

What if my body is not failing me? What if it is trying to protect me?

However, polyvagal theory should be presented with an important scientific caveat. Some of its anatomical, evolutionary and three-state explanations remain strongly debated. It can be a helpful therapeutic lens, but it should not be treated as a complete or universally accepted map of human neurophysiology.

Rather than labelling yourself as “dorsal vagal”, you might simply notice:

I feel activated.
I feel overwhelmed.
I feel disconnected or shut down.

Then ask:
What might help me reconnect with my body and the present moment?

Regulation Does Not Mean Permanent Calm

Nervous-system regulation does not mean remaining serene while the world falls apart.

It means having the flexibility to respond appropriately: mobilising when action is necessary and recovering when the challenge has passed.

A regulated person can still feel angry, anxious, sad, energised, excited, and overwhelmed.

Regulation is not the absence of emotion. It is the capacity to notice, respond, and return.

We also do not regulate entirely alone.

A calm voice, safe touch, eye contact, laughter, feeling heard, and spending time with someone we trust can all influence our physiological state. This is sometimes called co-regulation.

Sometimes the most sophisticated nervous-system intervention is dinner with someone you love.

The Stress Bucket and Wellness Paradox

Consider everything that may already be sitting in your stress bucket:

• Work
• Children
• Relationships
• Financial pressure
• Caregiving
• Illness
• Perimenopause
• Poor sleep
• Emotional stress
• Constant notifications

Now add:

•  Fasting
• Calorie restriction
• HIIT
• Cold exposure
• Excessive caffeine
• Alcohol
• Undereating
• Over-exercising
• Trying to reach 12,000 steps
• Constant negative self-talk

None of these factors necessarily overwhelms the system on its own. The question is:

How full was your bucket before you added them?

Imagine a woman who sleeps for six hours, checks her phone as soon as she wakes up and skips breakfast because she is fasting. She has two coffees, rushes to work, does a high-intensity workout, restricts her calories and tries to reach 12,000 steps. She finishes the day with an ice bath because she heard it reduces cortisol. Her body does not know that she is biohacking. It is responding to the total load. Fasting, exercise, heat and cold can all be useful hormetic stressors. But hormesis works when we have the resources to adapt.

• The dose matters.
• The person matters.
• The context matters.
• Recovery matters.

Sometimes the hardest workout is not the healthiest workout for you that day. Perhaps the better question is not always:

What else can I add?

It may be:

What can I take away?

Burnout. It is not Failure of Motivation

Burnout is not simply being tired, and it is not necessarily cortisol being permanently high.

It develops in the context of prolonged demands combined with inadequate resources and recovery.

Burnout may involve:

• Physical and emotional exhaustion
• Detachment or cynicism
• Reduced motivation and effectiveness
• Disrupted sleep
• Emotional flatness
• Feeling exhausted but unable to switch off
• Feeling that even small demands are too much

At first, prolonged stress may feel “wired”: rushing, overthinking, doing more and struggling to sleep. After enough time, it may begin to feel like depletion: exhaustion, withdrawal, and loss of motivation. That does not mean the nervous system has literally shut down. It means the person’s resources and capacity have been overwhelmed. Burnout physiology is variable. It cannot be diagnosed through one cortisol test, one wearable or one heart-rate variability score. Ask yourself: Am I tired because I need more motivation—or because I have been overriding my body for too long?

Negative Self-talk

What is the most stressful voice you hear every day?

Sometimes it is your own.

• I look terrible.
• I have no willpower.
• I shouldn’t have eaten that.
• Why can everyone else cope better than I can?
• What is wrong with me?

The brain can respond to anticipated and internally generated threats as well as physical danger. You cannot spend all day attacking yourself and expect a five-minute meditation to undo it.

Try replacing: What is wrong with me? With: What does my body need from me?

Regulation, Hormones, and Weight

The nervous system does not operate in a separate room from your reproductive hormones, metabolism, immune system, or sleep. These systems continually communicate. Around perimenopause, fluctuating hormones, disrupted sleep, temperature regulation, life demands and changes in recovery may all interact. This does not mean that every symptom is caused by “high cortisol” or that your hormones are broken. It means the body is a connected system.

Does improving nervous-system regulation automatically make you thin? No.

Parasympathetic activity is not a magical fat-burning switch. However, chronic stress, poor sleep and inadequate recovery can influence appetite, cravings, food choices, glucose regulation, energy, exercise recovery and emotional eating.

Supporting regulation may make the behaviours and physiology involved in healthy weight management easier.

Recovery Requires Resources

Before buying another supplement for your nervous system, look at the foundations. Recovery requires:

• Adequate sleep
• Morning daylight and a stable circadian rhythm
• Enough energy and protein
• Essential fats, micronutrients, plants and fibre
• Appropriate movement
• Hydration
• Boundaries
• Quiet
• Human connection
• Time away from constant notifications

You cannot demand enormous amounts from your body while continually giving it less sleep, less nourishment, and less recovery.

Nourishment Before Optimisation

Supplements such as magnesium, omega-3s, ashwagandha, L-theanine, or glycine may be useful for certain people, but supplements cannot compensate for chronic under-sleeping, under-eating, and overtraining.

Supplements should supplement the foundation.

A simple five-minute return

You do not need an app, supplement, or expensive piece of equipment to begin reconnecting with your body.

1. Orient

• Look around slowly.
• Notice three things you can see and let your brain register where you are.

2. Release. Unclench your jaw. Drop your shoulders. Relax your tongue. Open your hands.

3. Breathe
Breathe in gently through your nose for approximately four seconds. Allow the breath to leave comfortably for approximately six seconds. Do not force enormous breaths.

4. Connect
Place a hand over your heart or abdomen.

Ask:
What do I need right now?
Not:
What else should I be doing?

5. Reframe
If you are telling yourself, “I cannot cope,” try:
“I do not have to solve everything right now. I only need to deal with what is in front of me.”

Your nervous system has been protecting you since before you could speak.

It is not something you need to conquer, hack or reset as though it were broken. It is something you can learn to listen to, understand and support.

Life will never remove every stressor. The aim is to develop the capacity to move into challenge when necessary—and then find your way home again.

Health is not, never being activated. Health is knowing how to come back.

We’re living in an era of optimisation—tracking, supplementing, fasting, cold plunging, and constantly trying to improve our health.

But in the pursuit of better health, wellness itself can become stressful. Perhaps what we need isn’t less stress, but better recovery.

Because health isn’t about avoiding stress. It’s about having the capacity and resources to recover from it.

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