Is Cortisol Really the Reason You Feel Stressed? Cortisol Explained

It's 7am. You're already behind on your morning routine. Your phone's buzzing, your morning coffee has gone cold, and your chest is doing that thing again. Cortisol, apparently. Except cortisol was doing its job before you even opened your eyes.

Cortisol gets the blame for poor sleep, burnout, “cortisol face”, and the list goes on. It has also found itself at the front and center in every conversation about stress. But is this “stress hormone” actually what causes you to feel frazzled, tense, or overwhelmed? Or is there a more complicated story behind cortisol's damaged reputation?

TL;DR:

Cortisol isn’t the reason you *feel* stressed, but it does play a key role in how your body handles stress.

---

What Is Cortisol and Why Does Your Body Produce It?

Cortisol - what is it?

So, cortisol: what is it, exactly? Cortisol is a hormone produced in your adrenal glands, released as part of your body's response to everything from waking up in the morning to a last-minute deadline. Its main job isn’t just reacting to stress, but it is important to understand the relationship between them.

Think about how you feel in the moments before a big presentation. Your heart is racing, focus is sharp. That is your HPA axis doing its job producing cortisol. A little stress here and there can actually help us manage these situations (e.g. presenting), more effectively. When you encounter a stressful situation, the hypothalamus (in your brain) signals the pituitary gland, which tells the adrenal glands to release cortisol. This hormone helps prepare your body to respond effectively by activating the body's natural "fight-or-flight" response, and then return to baseline once things settle. It’s a finely tuned system that has been helping to keep us alive for hundreds of thousands of years, and not necessarily a sign that something’s wrong.

As cortisol levels rise, several changes occur in the body, including:

• An increase in heart rate
• Faster breathing
• Greater alertness and focus
• Increased blood sugar levels

How are cortisol levels regulated

Your cortisol hormone levels aren’t static. They follow a natural 24-hour rhythm, highest in the early morning, and tailing off by bedtime. This daily swing helps you feel alert early- ready to conquer the day, and sleepy later- ready for your bedtime routine. Read more on circadian rhythms here.

Short-term rises in cortisol, from exercise, a busy morning, or something unexpectedly exciting, are completely normal. They're your body doing what it's designed to do. Problems only really arise when cortisol stays high (or low) over long stretches. Cortisol related health conditions are rare, but if you are worried about your cortisol levels, it is best to speak to a medical professional.

---

Cortisol and Stress: What’s the Real Connection?

When you encounter stress, maybe it’s deadlines, workloads, life changes, or even exciting good news - your brain calls for cortisol. The hormone gears up your body: more glucose for energy, less focus on systems like digestion. This spike is your body’s way to prepare, survive, and return to normal once the threat passes.

A common misconception is that you “feel” stressed just because cortisol is high. In reality, stress is a much bigger picture: your thoughts, environment, brain chemistry, and a whole cast of other hormones and neurotransmitters, including adrenaline and dopamine, all play a part. Cortisol is one piece of that.

In summary: when something stressful happens, cortisol responds. It is the responder, not the cause.

---

Can Diet Influence Cortisol?

There is no specific formula, and no quick fix, if you are looking to decrease cortisol levels. However, studies have shown that when switching to a more balanced diet, with carbohydrates coming from whole grains, as well as fruits and vegetables, people may have lower cortisol levels. Why not try swapping white bread, for a whole wheat loaf, and adding an extra portion of veggies to your evening meal.

There are also studies that suggest a bit of a circular link between the gut microbiome and stress. One study suggests that stress influences what you reach for, and what you regularly eat influences the environment your gut bacteria live in. Similarly, another research study suggests that diets higher in fiber, protein, and unsaturated fats were associated with a more diverse gut microbiome. Research is still developing, but current studies suggest that eating reasonably well, most of the time, may support cortisol levels.

Read more on balancing your hormones with diet.

Supporting cortisol levels is about more than a single hormone. It’s about the whole ecosystem of your well-being. When you eat a balanced diet, move, connect, and rest in ways your body likes, you’re helping to build resilience, and your body and mind may bounce back from stress better. There’s no magic solution, and every situation is different, but small consistent changes may help you to feel steadier overall.

Eating a Balanced Diet

A balanced diet contains all five food groups in their recommended proportions. The five food groups include:

• Carbohydrates - think bread, pasta, rice (swap to whole grain for a fiber boost)
• Protein - beans, chickpeas, lentils
• Fat - oil, avocado
• Dairy and alternatives - soya milk, cheese
• Fruit and vegetables

To kick you off here is an example of a day's meal plan to get an idea:

Breakfast: Berry overnight oats with a coffee and a glass of water.

Lunch: Roasted vegetables in a whole wheat flatbread with leafy greens and a dollop of hummus. Serve with a can of Energy+.

Snack: Huel Complete Nutrition Bar or chop up some apple slices and a handful of grapes.

Dinner: Stir-fry noodles, plenty of various veggies, soy sauce, ginger, and tofu.

Suggested reading:

• The Beginner’s Guide to Nutrition
• How to build a healthy daily eating routine
• The Ultimate 7-Day Healthy Meal Plan to Reset Your Routine

---

Key takeaways

• Cortisol is a normal, essential part of how your body functions, and is crucial for your long term health.
• Cortisol is not the enemy, and it’s not the whole story either.
• Sustainable lifestyle habits e.g. a balanced diet may be a way to support healthy cortisol levels, but there’s no instant fix.

---

FAQs

Q: What does cortisol actually do?

A: Cortisol is a hormone made by the adrenal glands. It influences many functions such as: metabolism, blood sugar levels, blood pressure, heart rate and circadian rhythms.

Q: How do cortisol levels change when I am stressed?

A: It is a response, not a cause. Your brain signals the body to prepare, and cortisol is part of that preparation. Levels usually rise quickly, and drop once things have settled.

Q: Does high cortisol always mean you are stressed?

A: Not always. Exercise, illness, and even the time of day can temporarily raise cortisol. Context and your overall symptoms matter most.

Q:What can support cortisol levels?

A: Aim for regular sleep, balanced meals, daily movement, and time to actually decompress.