Apparently Everything Is Cortisol’s Fault Now… But What Does The Science Actually Say?

“High cortisol” has become one of the biggest buzz phrases in the health world lately. Social media often makes it sound like cortisol is the enemy behind every symptom imaginable weight gain, bloating, poor sleep, cravings, anxiety, fatigue and stubborn belly fat.

But cortisol itself isn’t bad. In fact, you need it to survive. The problem is when your body is exposed to stress constantly, without enough recovery, nourishment or downtime to balance it out. That’s when cortisol can stay elevated for too long and start impacting how you feel physically and mentally.

The good news? You don’t need a juice cleanse, expensive supplements or a “cortisol detox”. Your daily habits, food choices, sleep, movement and stress load have a huge influence on how your body regulates cortisol naturally.

What Is Cortisol?

Cortisol is a hormone produced by your adrenal glands in response to stress.

It’s part of your body’s built-in survival system.

Cortisol helps:

• regulate blood sugar

• manage inflammation

• control your sleep-wake cycle

• increase alertness

• mobilise energy during stressful situations

Short bursts of cortisol are normal and healthy.

For example:

• waking up in the morning naturally increases cortisol

• exercise temporarily raises cortisol

• dealing with an emergency activates cortisol

The issue isn’t cortisol itself.

The issue is chronic stress without adequate recovery.

What Chronic Stress Does To The Body

When stress becomes constant, the body starts prioritising survival over optimal function.

Research has linked chronically elevated cortisol levels with:

• disrupted sleep

• increased cravings for high-fat and high-sugar foods

• increased abdominal fat storage

• higher blood sugar levels

• fatigue and burnout

• impaired recovery

• reduced muscle mass over time

• mood disturbances and anxiety

Your body essentially stays in a heightened “go-go-go” state.

And many women are living there permanently.

Busy schedules. Work stress. Parenting. Poor sleep. Over-exercising. Under-eating. Constant notifications. Mental load. Financial stress.

The body doesn’t necessarily separate emotional stress from physical stress. It all adds to the total load.

Under-Eating Can Increase Cortisol

This is one of the biggest misconceptions in the fat loss world.

Many women trying to “get healthy” accidentally create more stress inside the body by:

• skipping meals

• eating tiny salads

• avoiding carbs

• excessively restricting calories

• over-training without enough fuel

Your body interprets this as a threat.

Studies show aggressive calorie restriction can increase cortisol levels because the body perceives food scarcity as stress.

This is one reason extreme dieting often leads to:

• low energy

• intense cravings

• irritability

• poor sleep

• loss of motivation

• binge-restrict cycles

Sometimes eating more consistently actually helps the body feel safer and more regulated.

Blood Sugar Stability Matters More Than People Realise

Frequent blood sugar crashes can place additional stress on the body.

When blood glucose drops too low, cortisol helps raise it back up by releasing stored energy.

This means constantly running on:

• coffee

• sugary snacks

• skipped meals

• ultra-processed convenience foods

…can contribute to a rollercoaster of energy highs and crashes.

Foods that support steadier blood sugar include:

• protein-rich meals

• high-fibre carbohydrates

• healthy fats

• balanced meals eaten consistently

Examples:

• eggs on grainy toast with avocado

• Greek yoghurt with berries and nuts

• chicken, rice and vegetables

• oats with protein and chia seeds

Balanced meals help reduce dramatic blood sugar swings, which may help reduce unnecessary cortisol spikes throughout the day.

Carbohydrates Aren’t The Enemy

This one surprises people.

Very low carbohydrate diets may increase cortisol in some individuals, particularly active women.

Carbohydrates help support:

• serotonin production

• glycogen replenishment

• nervous system regulation

• sleep quality

This doesn’t mean you need to eat excessive amounts of refined carbs.

But chronically avoiding carbohydrates altogether can sometimes make women feel:

• wired but tired

• flat

• irritable

• unable to recover properly

Including quality carbohydrate sources like:

• oats

• rice

• potatoes

• fruit

• wholegrain breads

• legumes

…can support both energy and nervous system function.

Magnesium-Rich Foods May Help Support Stress Regulation

Magnesium plays a role in nervous system regulation, muscle relaxation and sleep quality.

Low magnesium intake has been associated with increased stress responses and poorer sleep quality in some studies.

Magnesium-rich foods include:

• pumpkin seeds

• almonds

• spinach

• dark chocolate

• legumes

• wholegrains

While supplements can be useful in some cases, food first is always a great foundation.

Caffeine And Cortisol

Coffee itself isn’t automatically harmful.

But relying on caffeine while under-slept, under-fed and highly stressed can amplify the “wired but exhausted” feeling many women experience.

Caffeine stimulates cortisol release temporarily.

For some people, this isn’t a problem.

But if you already feel:

• anxious

• shaky

• exhausted

• overstimulated

• unable to sleep properly

…it may help to:

• avoid caffeine on an empty stomach

• reduce excessive intake

• avoid caffeine late in the day

• pair coffee with proper meals instead of using it as breakfast

Sleep Is One Of The Biggest Cortisol Regulators

Poor sleep and elevated cortisol often feed into each other.

High stress can worsen sleep, and poor sleep increases cortisol further.

Research consistently shows sleep deprivation impacts:

• hunger hormones

• stress hormones

• blood sugar regulation

• appetite

• recovery

Some simple habits that may help:

• consistent sleep and wake times

• reducing bright screens before bed

• eating enough during the day

• reducing late-night stress stimulation

• morning sunlight exposure

• avoiding intense exercise too close to bedtime if it affects sleep

You do not need a perfect sleep routine.

But your nervous system does need opportunities to downshift.

Gentle Movement Can Lower Stress Hormones

Exercise is healthy stress.

But too much high-intensity training without recovery can add to the body’s overall stress load.

For women already exhausted and overwhelmed, more intense exercise is not always the answer.

Research shows lower-intensity movement can support stress regulation, including:

• walking

• Pilates

• yoga

• mobility work

• light resistance training

Even a 10-minute walk outdoors can help regulate the nervous system and improve mood.

The goal isn’t punishment.
It’s supporting the body.

Your Nervous System Needs Safety — Not Perfection

Many women are stuck in a cycle of:

• all-or-nothing dieting

• guilt around food

• over-exercising

• constantly “starting again Monday”

• never properly resting

That constant mental pressure becomes stress too.

Reducing cortisol isn’t about being “perfectly healthy”.

It’s about creating enough consistency, nourishment, rest and support for your body to stop feeling like it’s constantly fighting to keep up.

Small Habits That Can Support Lower Cortisol

You do not need to overhaul your life overnight.

Small things matter.

Habits worth focusing on:

• eating balanced meals consistently

• including enough protein and fibre

• not skipping meals all day

• reducing extreme dieting

• walking daily

• prioritising sleep where possible

• spending time outdoors

• reducing excessive caffeine

• making time for enjoyment and downtime

• strength training without overdoing it

• building routines that actually fit your real life

Because health isn’t just about calories and workouts.

Your nervous system matters too.

Need Help Creating More Balanced Eating Habits?

If you constantly feel exhausted, stressed, stuck in a cycle of under-eating and over-snacking, or like your body is running on adrenaline and caffeine, you’re not alone.

This is exactly the kind of thing I help women work through in my nutrition coaching.

Together, we focus on realistic, balanced nutrition habits that support:

• energy

• mood

• recovery

• sustainable fat loss

• blood sugar balance

• better relationship with food

• long-term health

No extremes. No detoxes. No perfection required.

You can learn more about my nutrition coaching through H for Health.