The connection between stress and cortisol, and how to keep it in check

Most of us know cortisol as the thing that spikes when we're stressed. That's true, but it's only part of the story. Cortisol also helps manage how your body uses glucose, plays a role in appetite and weight, and keeps a hand in all sorts of everyday processes. It's less a villain than a manager that gets overworked, and understanding the connection between stress and cortisol helps you spot when it's tipped out of balance.

What cortisol actually is

Cortisol, sometimes called hydrocortisone, is a steroid hormone made by the adrenal glands that sit on top of your kidneys. It's released alongside adrenaline when your brain senses a threat. Where adrenaline handles the immediate fight-or-flight jolt, cortisol does the slower work: raising blood glucose so your brain has fuel, and making repair materials more available. In short bursts, that's exactly what you want. The trouble starts when the bursts never stop.

What cortisol does when it's working well

In balance, cortisol quietly runs a lot of useful jobs. It helps your body break down carbohydrates, fats and proteins so you can actually use what you eat. Inflammation, blood pressure and blood sugar are kept within sensible limits. Your sleep-and-wake rhythm is shaped partly by cortisol, which also lifts energy when you need to push through something. There's even a role in your salt-and-water balance, memory and focus. None of that is dramatic, which is rather the point: healthy cortisol works in the background.

What happens when stress won't switch off

The problems come with chronic stress, when cortisol stays elevated instead of rising and falling. Kept high for too long, it's been linked to anxiety, low mood and a weaker immune response. Digestion can be unsettled and the heart put under strain. Weight tends to creep on, especially around the middle, and the risk of type 2 diabetes rises over time. There's also the hormonal balance that affects fertility, libido and clear thinking, which chronic stress can quietly disturb. That's a long list, and it's exactly why keeping stress in check is worth taking seriously.

Practical ways to bring cortisol down

The good news is that everyday habits genuinely help. A few that consistently make a difference:

• Regular movement, even a brisk daily walk, to burn off stress
• Mindfulness or meditation, to give the nervous system somewhere to settle
• A diet low in refined sugar and richer in omega-3s and vitamin C
• Going easier on caffeine and alcohol
• Balanced meals with enough protein and fibre
• Real sleep, ideally seven hours or more of the restorative kind
• Acupuncture and auriculotherapy, to support that shift out of constant stress mode

On that last one: in my practice, acupuncture and ear-seed work are a gentle way to nudge the body from "fight or flight" toward "rest and digest." I wouldn't frame it as lowering a number on a blood test, but many clients describe feeling calmer and sleeping better, which is where a lot of stress and cortisol trouble begins.

Keeping stress and cortisol in balance

Cortisol isn't the enemy. It's a hormone doing an important job that simply gets overloaded when stress never lets up. Once you understand the connection between stress and cortisol, the small changes make more sense, and they add up. You can read more about my background or the full treatments I offer if you'd like support with the stress side of it.

Warmly,
Sandra de Catalina
Naturopath specialising in acupuncture