What Should You Avoid If Your Cortisol Is High?

If your cortisol is high, cut back on caffeine, alcohol, added sugar and processed food, and hard exercise without proper recovery — each one measurably raises cortisol or keeps it from settling back down. One trial found even a moderate 300mg of caffeine a day, about three cups of coffee, can leave cortisol elevated into the evening.

"I've cut the coffee, I'm trying to sleep more, and my cortisol is still high." That's the frustrating part nobody warns you about. Most lists stop at "avoid stress." They don't say how much is too much, or why some of this takes longer to unwind than a weekend of clean living.

What actually counts as "high" cortisol?

Your cortisol is meant to rise and fall across the day. It peaks soon after you wake and drops toward bedtime, and it's supposed to spike under real stress. The problem isn't cortisol showing up for you. It's cortisol staying switched on once the stressor has passed.

That pattern sits behind fatigue, weight gain around your middle, poor sleep and, over years, higher blood pressure, per the Cleveland Clinic. Whether a doctor has confirmed yours is elevated, or you just recognise this in yourself, here's what actually moves the needle for you.

Foods and drinks that keep cortisol elevated

Caffeine doesn't just spike your cortisol once and stop. A trial gave adults 300mg or 600mg of caffeine a day for five days, then tested their response. At 300mg — about three cups of coffee — your cortisol would still be measurably elevated into the early evening (Lovallo et al., 2005). Only the higher 600mg dose blunted the morning spike, and even that didn't stop the afternoon rise. Cutting back does more for you here than switching to decaf after lunch.

Alcohol raises your cortisol too, more than casual drinking guides suggest. A study of over 8,900 adults found each extra standard drink a day raised cortisol by roughly 0.36 µg/dL in men — a causal effect, not a coincidence (Yang et al., 2021).

Worth knowing: that same study found no significant effect in women. That's a genuine gap in the evidence, not something to read past.

Added sugar and heavily processed food feed the same cycle from another angle. They drive the blood sugar swings your body reads as a minor emergency, and it answers with cortisol. An occasional dessert won't undo your progress. It's the daily pattern that counts for you.

Habits that quietly do the same thing

Skipping sleep blunts your natural evening drop in cortisol, so you wake up already running hot the next day, per the Cleveland Clinic.

Undereating is the one you might not expect. A controlled study found that restricting calories on its own — not just eating less healthily, but eating less overall — raised total cortisol output (Tomiyama et al., 2010). If you've ever crash-dieted and felt more wired and puffier, not less, this is likely why.

Chronic, unmanaged stress is the obvious one, but "manage your stress" is unhelpfully vague. The two habits below are where that advice gets specific — and where it gets more complicated than most articles let on.

Why "just rest a few days" undersells overtraining

Intense exercise without proper recovery is on every list of cortisol triggers, usually with a throwaway line about "not overdoing it." What that undersells is how long it can take to come back from, and how easily it's missed.

A long-running thread among endurance athletes on the Slowtwitch triathlon forum gives you a clearer picture than any single study. Several experienced athletes independently described the same arc. Your symptoms can get worse in the first week or two after you cut back, not better.

Recovery ran from a few weeks for milder cases to two years or more for severe ones. Standard bloodwork often came back normal despite real, disabling fatigue. One contributor put it plainly — cutting training helped enormously, but "my former racing speed is just… gone."

This is third-party experience, not a clinical result, and it won't apply to one hard week at the gym. But if you train seriously and something feels persistently off, give it weeks and months to resolve, not days.

The cortisol-supplement trap

Ashwagandha, adaptogens and high-dose vitamin blends are everywhere in the "lower your cortisol naturally" conversation. Some of the research backs them up. The NIH's Office of Dietary Supplements notes several trials where ashwagandha extract lowered stress, anxiety and cortisol against placebo.

But that same review documents real risks for you to weigh: reported cases of liver injury, effects on thyroid hormones, and advice against use during pregnancy or with hormone-sensitive prostate cancer (NIH Office of Dietary Supplements). Taken for months or years, its safety simply hasn't been studied.

A patient support forum thread on this exact topic makes the risk concrete. Two members warned against reaching for supplements before you get a proper diagnosis. One recalled a fellow member who'd overdosed on vitamin pills. Another pointed out that if your real cause is a pituitary or adrenal tumour, a supplement gives you "a false sense of security" while it goes untreated. Self-treating first and asking questions later is the pattern to avoid.

Does gentle exercise like Pilates help?

Probably a little, but not by lowering cortisol directly. We've looked at this question properly in Does Pilates lower cortisol? — the short version is that the most-cited Pilates study found cortisol went up, not down, even as anxiety and mood improved. What the evidence does support is that slow, paced movement lowers how stressed you feel, which is a real and useful thing on its own. It just isn't the same claim as "lowers your cortisol."

For what the research says about which exercise helps, see What is the best exercise for high cortisol levels?

If it's the calming, nervous-system side of that you're actually after rather than the cortisol number, that's a vagus nerve exercises question, not a cortisol one — and it's one we can actually answer with decent evidence.

When it's time to see a doctor

Diet and lifestyle changes help with everyday elevated cortisol. They're not a substitute for medical care if you notice:

• Rapid, unexplained weight gain, especially around your face and midsection
• Wide, purple stretch marks
• Muscle weakness that makes stairs or jars hard to open
• Persistent high blood pressure or blood sugar
• Symptoms that don't ease despite real changes to sleep, diet and exercise

These can point to Cushing's syndrome or another treatable condition your GP can test for. A supplement won't fix that, and neither will another article.

FAQ

What foods make high cortisol worse?
Added sugar, ultra-processed snacks, and high caffeine intake are the most consistently cited culprits, both in research and in what AI tools currently surface when asked this question directly.

How do you flush cortisol out of your body?
You don't need to. Cortisol is essential; the goal is bringing a chronically elevated baseline back down through sleep, moderate exercise, and the changes above — not eliminating it.

What are the warning signs of high cortisol?
Central weight gain, a rounder face, thin or easily bruised skin, muscle weakness, high blood pressure, and mood changes are the most recognised signs, per the Cleveland Clinic.

The verdict

If your cortisol is running high, the biggest, best-evidenced wins are cutting back caffeine and alcohol, steadying your blood sugar instead of skipping meals, and giving intense exercise real recovery time — not just a rest day. Skip the supplement shortcut until you know what you're actually treating.  Once you've cut the things that keep cortisol elevated, here's what to do instead, step by step.

If it's been weeks and nothing's shifting, that's worth a conversation with your GP rather than a longer list of things to avoid. And if you're weighing up equipment for a slower, more sustainable way to move — the kind that supports this rather than working against it — our buyer's guide walks through what matters, or you can speak with a specialist directly.