When I started working as a nutritionist around eight years ago, most women came to me wanting to push harder. That usually meant training more, eating less and trying to be more disciplined.
Now? So many of my clients want calm. Proper recovery. Energy that lasts the whole day.
I love that shift. But unfortunately, cortisol has become a word that's used to sell you things. Cortisol face, cortisol belly, cortisol-lowering supplements and adrenal cocktails are all over social media, and it's hard to know what's real.
So in this post, I'm going to walk you through what cortisol actually does, what genuinely affects your cortisol levels, and what's just clever marketing. Most importantly, you'll come away with practical, food-first changes that make a real difference to your energy, sleep and stress.
What is cortisol? (And why it isn't the enemy)
Cortisol is a hormone made by your adrenal glands, which sit on top of your kidneys. You'd be in serious trouble without it.
It helps you wake up in the morning. It keeps your blood sugar steady between meals, helps regulate your blood pressure and controls inflammation. It's also part of your stress response, giving you the energy and focus to deal with whatever's in front of you.
Cortisol follows a daily rhythm
Your cortisol levels aren't meant to be flat. They rise sharply in the first 30 to 45 minutes after you wake up. That's completely normal, and it's what gets you out of bed.
From there, cortisol gradually falls through the day, reaching its lowest point around midnight. That evening dip is what allows you to wind down and fall asleep.
So the problem isn't having cortisol. It's when that rhythm gets disrupted, or when cortisol stays high when it should be coming down. That's when women tend to notice feeling wired but tired, struggling to sleep, craving sugar and running on empty.
What genuinely affects your cortisol levels
1. Sleep
This is the big one.
Research has shown that even a few nights of restricted sleep raise cortisol levels in the evening, exactly when they should be dropping. Higher evening cortisol then makes it harder to fall asleep the following night, so the cycle feeds itself.
Poor sleep also makes you hungrier, more drawn to sugary foods and less able to handle stress the next day. You can't out-supplement a run of five-hour nights.
You would protect your sleep like it's an appointment. That means a consistent wake time (even at weekends), daylight in the morning to anchor your body clock, and a wind-down that doesn't involve scrolling or answering emails in bed.
2. Under-fuelling
One of cortisol's main jobs is keeping your blood sugar up when food isn't coming in. So when you go long periods without eating, your body leans on it more.
Skipping breakfast, a fasted workout, a small salad at 2pm, then wondering why you're wired, anxious and starving by evening? That's your body working very hard to keep you going.
Chronic under-eating is a stress your body takes seriously, whether you feel "stressed" or not. It's one of the most common patterns I see in women who feel exhausted despite "doing everything right".
You would eat within a couple of hours of waking, include protein at every meal, and avoid long gaps without food during the day.
3. Caffeine
Caffeine does raise cortisol, and the effect is bigger if you don't drink it regularly or you've slept badly.
Coffee itself has plenty of benefits, so coffee isn't the problem. Context is. Coffee instead of breakfast, after a rough night's sleep, is where it becomes an issue. A study from the University of Bath found that a strong black coffee before breakfast, after a broken night, noticeably worsened the body's blood sugar response to that breakfast.
What about the trend of waiting 90 minutes before your first coffee? There's no strong evidence you need to. Having your coffee with or after food is the more useful change for most women.
4. Training without recovery
Exercise raises cortisol. That's normal and healthy. It's part of how your body adapts and gets stronger.
Where it becomes a problem is the combination: high-intensity training most days, not eating enough to fuel it, and not sleeping enough to recover from it. That's when women tell me they're doing everything right and still feel exhausted, can't shift weight, and are getting injured or ill more often.
You would mix harder sessions with strength work, walking and genuine rest days. You would eat after training rather than "saving" the calories. You could also look at working with your menstrual cycle, noticing when your energy is naturally higher or lower and adjusting your training to suit.
5. Life itself
It's easy to focus on food and forget the obvious. Work pressure, money worries, caring for children and ageing parents at the same time, and the mental load of keeping a household running.
That ongoing, low-level stress affects your cortisol too. No smoothie or supplement cancels it out.
The things with the best evidence are frustratingly unglamorous. Regular movement, time outdoors, time with people you like, and boundaries that protect some space for yourself.
What's just marketing
Adrenal cocktails
Adrenal cocktails (usually orange juice, coconut water and a pinch of salt) are everywhere at the moment, often sold as a way to support your adrenals. They're a perfectly pleasant drink, but there's no good evidence they do anything to your cortisol.
If you're reaching for one mid-morning because you're flagging, you'd likely be better off with a proper, nutrient-dense snack that includes protein. That steadies your blood sugar, which takes pressure off cortisol in the first place. A few ideas:
Greek yoghurt with berries and a sprinkle of seeds
An apple with a handful of nuts or a spoonful of nut butter
Oatcakes with hummus or cottage cheese
A boiled egg or two with cherry tomatoes
Cortisol face and cortisol belly
A puffy face in the morning is far more likely to be down to poor sleep, alcohol, a salty meal the night before or the time of the month.
Weight gain around your middle in your 40s is very often linked to falling oestrogen in perimenopause, along with poorer sleep, muscle loss and moving less. Cortisol alone is rarely the full story.
Genuinely high cortisol, known as Cushing's syndrome, is rare. Signs include a rounded face alongside purple stretch marks, easy bruising, muscle weakness and high blood pressure. The most common cause is long-term steroid medication. If that sounds like you, speak to your GP rather than a wellness influencer.
Should you test your cortisol?
Home saliva tests that give you a single cortisol reading are popular, but cortisol changes hour to hour and responds to everything from a bad night to a stressful commute. One snapshot tells you very little on its own.
This is where the DUTCH test can be really helpful, and it's one I run with many of my clients. Rather than one reading, it uses dried urine samples collected at several points across the day, so we can see your cortisol pattern from waking through to bedtime. It also shows how your body is breaking down cortisol, alongside your sex hormones such as oestrogen and progesterone.
That level of detail means we can get really specific with the changes we put in place. If your cortisol is low first thing, for example, getting outside in daylight as soon as you wake becomes a priority. If it dips through the afternoon, we look at building in more support during the day, such as a protein-rich lunch and a proper snack. Rather than guessing, we match your plan to your pattern.
Testing isn't essential for everyone, and the foundations below help almost everyone. But if you've already got the basics in place and still feel wired, tired or flat, it can show us exactly where to focus.
How to support healthy cortisol levels naturally
Here's what actually helps:
Eat breakfast, and include protein (eggs on wholegrain toast, Greek yoghurt with berries and seeds).
Have your coffee with or after food, especially after a bad night.
Don't go more than four or five hours without eating during the day.
Get outside in daylight in the morning.
Keep a consistent wake time, even at weekends.
Balance hard workouts with strength training, walking and rest.
Cut back on alcohol, particularly if your sleep is suffering.
Sorry, it's not as exciting as a cortisol-lowering supplement or an adrenal cocktail. But it's much more effective, and completely free.
Cortisol FAQs
What are the signs of high cortisol in women?
Common signs that your stress response is under strain include feeling wired but tired, poor sleep (especially waking in the night), sugar cravings, low energy in the afternoon and feeling anxious or irritable. These overlap with many other things, including blood sugar dips, low iron and perimenopause, so they're a reason to look at the bigger picture rather than self-diagnose.
Does coffee raise cortisol?
Yes, caffeine raises cortisol, especially if you don't drink it often or you've slept badly. For most women, the most helpful change is drinking coffee with or after food rather than on an empty stomach.
Do adrenal cocktails work?
There's no good evidence that adrenal cocktails lower cortisol. If you're flagging mid-morning, you'd likely be better off with a proper, protein-rich snack that steadies your blood sugar, such as Greek yoghurt with berries or an apple with nut butter.
Is cortisol belly real?
Cortisol can play a part in where your body stores fat, but weight gain around the middle in midlife is more often linked to falling oestrogen in perimenopause, poorer sleep, muscle loss and moving less.
How can I lower my cortisol naturally?
Eat regular meals with protein, avoid long gaps without food, protect your sleep, get morning daylight, have caffeine with food, balance hard exercise with rest and cut back on alcohol.
What is the DUTCH test?
The DUTCH test is a hormone test that uses dried urine samples collected across the day. It shows your cortisol pattern from morning to evening, how your body processes cortisol, and your sex hormone levels. This helps tailor nutrition and lifestyle changes specifically to you, rather than guessing.
Want support with your energy, sleep and hormones?
If you've been feeling wired, tired and running on empty, you don't need another product. You need a plan that fits your life, your cycle and your stage of life.
I work one to one with women to get the foundations right: what you eat, when you eat it, how you train and how you recover. Together, we look at the full picture rather than chasing the latest trend.
Book a consultation and let's work out what your body actually needs.
