It's a day that you might find familiar. The 9am meeting goes brilliantly, then 3pm arrives, focus slides, and it's time for another coffee and something sweet from the drawer.
That night: exhausted but wired. The next morning: feeling like no sleep happened at all, and the cycle starts again.
Search any of that online and the answer that comes back is often high cortisol symptoms. The honest picture: these experiences are real, but they don't reliably tell you whether your cortisol is high. The Endocrine Society points out that tiredness, trouble sleeping or waking, sugar cravings and relying on caffeine are nonspecific. They can come with many conditions, or simply with a very full life (Endocrine Society).
Quick heads up: "high cortisol symptoms" is an internet label, not a medical diagnosis. But the symptoms themselves still deserve a proper look.
Stress, sleep and daily routine may play a part. So this post covers what cortisol actually does, why everyday symptoms can't diagnose it, the signs that genuinely need a GP, and the practical habits that may help you feel steadier.
What cortisol actually does (and why it isn't the enemy)
Cortisol gets a terrible reputation online, but you couldn't function without it. It's made by your adrenal glands and helps regulate how your body uses glucose for energy, manage inflammation and blood pressure, and run your sleep-wake cycle (Cleveland Clinic).
Levels naturally change across the day. For most people, cortisol is higher around waking and lower at night. During a stressful moment, it helps keep you alert and prompts your liver to release glucose for quick energy. Useful for a pitch or a tight deadline.
Stress can affect how cortisol is regulated, but there isn't one predictable pattern that chronic stress produces in everyone. It depends on the person, the type of stress and how long it lasts.
It's also worth knowing what "high cortisol" means medically. Cushing syndrome is a distinct condition caused by prolonged exposure to too much glucocorticoid, for example from steroid medication or certain tumours. It needs a doctor, not a nutrition plan. Feeling tired, craving sugar or sleeping badly doesn't establish that your cortisol is persistently high.
Why everyday symptoms can't diagnose high cortisol
Most of my clients don't arrive saying "I think my cortisol is off." They say they're tired, foggy and frustrated that nothing seems to work. Those experiences matter, but the things often labelled online as high cortisol symptoms are common to lots of situations, so they can't tell either of us what your hormones are doing.
Here are seven ways stress and disrupted routines can show up in daily life. They're often shared as signs of high cortisol, but none of them diagnose a hormone disorder.
1. Tired in the morning, wired at night
Needing two alarms to get up, then lying awake at 11pm with a racing mind. Stress and disrupted sleep can affect your body's daily rhythms, including cortisol. But this pattern on its own doesn't tell us what your cortisol levels are doing. Late caffeine, screens and an overloaded mind are just as likely to be involved.
2. The 3pm slump
Focus falls off mid-afternoon. Plenty of things can feed into this: a short night, a light or late lunch, long stretches without a break, or dehydration. Noticing what you ate and how you slept the night before is a more useful starting point than blaming a hormone.
3. Weight that settles around your middle
Too much glucocorticoid, as in Cushing syndrome, can cause characteristic weight gain around the face and abdomen. Belly fat on its own isn't evidence of high cortisol, though, and age, sleep, activity, alcohol, hormones and genetics all play a part.
4. Sugar cravings
The biscuits in the meeting room. The chocolate after a tough call. Cravings are common when you're tired, busy or haven't eaten enough earlier in the day. They aren't a reliable sign of your cortisol status.
5. Food noise
What should I eat? I shouldn't have had that. I'll start again on Monday. Constant food thoughts are exhausting, and a cycle of restricting then overdoing it tends to keep them loud.
6. Brain fog when you need to be sharpest
Losing a train of thought in a meeting, or rereading the same email three times. Poor sleep, stress, skipped meals and too many open tabs (literal and mental) can all affect concentration. If it's persistent or getting worse, it's worth raising with your GP.
7. Using wine to switch off
This one's a habit rather than a symptom. A glass or two after a long day can feel like the only way to come down, but alcohol tends to fragment sleep, which can leave you less rested the next day.
How a busy working week can wear you down
This isn't about being bad at handling pressure. A full calendar simply leaves little room for the basics. These are the patterns I see most often in ambitious professionals:
Coffee instead of breakfast. Not hungry in the morning, starving by dinner, with caffeine doing the heavy lifting in between.
Lunch at your desk, or not at all. A rushed sandwich between calls, or a handful of snacks, then wondering why the afternoon feels hard.
Late client dinners and drinks. Rich meals and alcohol close to bedtime can make it harder to sleep well.
Being "good" all week, then letting go at the weekend. The guilt cycle that follows is draining in its own right.
Training hard on short sleep and low fuel. Exercise is brilliant, but recovery matters as much as the session.
No real off switch. Emails at 10pm and a mind that keeps working after the laptop closes.
None of these is a disaster on its own. It's the stack, day after day, that leaves you feeling flat.
The myth: you just need more discipline
When energy is low and progress stalls, the instinct is often to go harder. Cut the carbs. Add another spin class. Push through the hunger.
The problem usually isn't the approach itself. It's doing more on top of too little sleep, too little food and too little recovery.
Cutting carbs works for some people, but if it means underfuelling, a 4pm dip and a raid on the biscuit tin can follow.
Extra cardio can feel like the answer to stalled progress, but on short sleep and skipped meals it can be more draining, not less.
All-or-nothing eating tends to feed the guilt cycle, which makes consistency harder.
More willpower usually isn't the missing piece. A routine a real working week can sustain is a better place to start.
Practical habits that may help you feel steadier
These habits may help you build a more consistent routine and work out what supports your energy and sleep. They are not a treatment for a diagnosed cortisol disorder. Pick one or two, try them for a fortnight and notice what changes.
Have a breakfast that keeps you going
If you usually run on coffee alone, try adding something with protein: eggs on toast, Greek yoghurt with berries and nuts, or a smoothie if you're out the door fast. Notice whether your mornings feel any different.
Build lunch around protein and fibre
A portion of protein, plenty of veg and a wholegrain or pulse (chicken, roasted veg and quinoa; a salmon and lentil salad) makes a filling lunch. It's worth experimenting with to see how your afternoons feel.
Plan your afternoon snack
Apple and a handful of almonds. Hummus and oatcakes. Having something ready means you're not relying on whatever is in the meeting room.
Review your caffeine timing
Caffeine can affect sleep for hours after your last cup. If nights are a struggle, try an earlier cut-off for two weeks and see what happens. A decaf or herbal tea can stand in for the afternoon flat white.
Have a plan for client dinners
Choose a main you'll enjoy that includes protein and veg, and alternate alcoholic drinks with water. You don't need to skip the dessert or the wine. You just need a plan you can repeat.
Get daylight early and wind down late
Morning daylight and a calmer, dimmer evening support a regular sleep-wake routine. Try a short walk outside before your first meeting, and put your phone outside the bedroom.
Pause before you eat
A few slow breaths before eating may help you slow down and feel calmer. Research on structured slow-breathing practices suggests potential benefits for stress, although effects vary.
A note on magnesium
Magnesium is heavily marketed for stress and sleep, but there isn't enough rigorous evidence to show it's effective for insomnia (NCCIH). It is not an established treatment for high cortisol. Speak to a qualified healthcare professional before taking any supplement.
When to see your GP about high cortisol symptoms
Some signs need a medical check rather than a change of routine. Speak to your GP if you notice weight gain in your face and belly, wide purple stretch marks on your stomach, bruising easily, muscle weakness in your upper arms or thighs, high blood pressure or high blood sugar (Cleveland Clinic). These can point to Cushing syndrome, which needs medical assessment and treatment.
The same goes for persistent or unexplained fatigue, poor sleep or weight change, even if they feel like the high cortisol symptoms you've read about. Thyroid problems, anaemia, sleep apnoea, low mood and perimenopause can all look similar, and they deserve proper investigation.
A word on cortisol testing
A clinician should decide whether testing is appropriate and which test to use. Investigating suspected Cushing syndrome may involve a late-night salivary cortisol test, a 24-hour urine collection or a dexamethasone suppression test. A random cortisol reading is not a general measure of how stressed you are, and a raised result doesn't automatically mean Cushing syndrome, which is why further tests are sometimes needed.
Bringing it home
Feeling wired at night, flat by mid-afternoon and caught in food noise is frustrating, and it deserves to be taken seriously. But those so-called high cortisol symptoms can't tell you your cortisol level. "You may be stressed and running on empty" and "your cortisol is high" are two different things, and only the second needs a medical test to confirm.
What you can work on is the routine underneath: more consistent meals, a realistic plan for client dinners and travel, and habits that fit the life you actually have.
Health isn't built through one big decision, it's built through the small choices we make every single day.
Want support building a routine that fits your working life?
Inside The Realign Method, my 6-month 1:1 programme, we build an eating routine around your working life, travel and family commitments. Together, we identify practical changes to support more consistent meals, energy and sustainable habits, without asking you to opt out of client dinners or your favourite foods.
If that sounds like what you need, book a free call and we'll talk about where you are now and whether it's the right fit.
Sources
Cortisol, Cleveland Clinic (medically reviewed February 2025)
Adrenal Fatigue, Endocrine Society (updated January 2022)
Magnesium Supplements for Sleep Disorders, NCCIH (updated January 2024)
Written by Alison Diss Nutrition
Alison Diss is a BANT Registered Nutritional Therapist, Personal Trainer and founder of The Realign Method. She created The Realign Method after her own experience of burnout in a high-pressure career and has helped 100+ ambitious professionals achieve steady energy, a sharper mind and a stronger body. She's based in Surrey and works with clients UK-wide and online.