Does This Actually Help You? Deep Dive on Coffee

It's not just what you're drinking - it's when

Let me paint you a picture.

You wake up at 6am. Before your feet even hit the floor, your mind is already running through the day. You make your way to the kitchen, and the first thing you do, the very first thing, is start the coffee. You need it. You cannot imagine starting without it.

I hear this from women constantly. And what I want to tell you gently, but clearly is that this pattern is worth examining. Not because coffee is the villain. But because the timing of your coffee may be doing something to your hormones that nobody ever told you about.

Your Body Has a Built-In Cortisol Alarm

Here’s something that gets glossed over in most coffee conversations: your cortisol is already rising when you wake up.

It’s called the Cortisol Awakening Response, and it’s one of the most elegant things your body does. In the first 30-60 minutes after you open your eyes, your cortisol naturally peaks. This is your body’s own built-in alarm system, it’s energizing you, clearing your mental fog, getting you ready to move. It’s not a stress response. It’s a wake-up response. Your body is doing exactly what it’s supposed to do.

Now here’s the problem: when you pour coffee into that window, you’re essentially spiking cortisol on top of cortisol. You’re adding a stimulant on top of a natural stimulant surge. And what happens when you do that repeatedly?

Your body starts to adapt. It down regulates its own natural cortisol response, because it knows the caffeine is coming. Over time, you become dependent on that external source of activation just to feel baseline normal. That mid-morning crash you blame on not having enough coffee? It might actually be your cortisol response becoming blunted because it stopped doing the work.

You’re not drinking coffee to feel good. You’re drinking it to make up for what your body stopped making on its own.

This is the trap. And it’s incredibly common.

The 90-Minute Rule

What research and what I’ve watched clinically over decades suggests is that waiting 60 to 90 minutes after waking before your first cup of coffee gives your natural cortisol awakening response time to do its job.

You let your body wake you up first. Then, when that wave tapers, the caffeine from your coffee steps in and extends your energy. Instead of competing with your cortisol, it complements it. You get a cleaner, steadier energy curve and you’re far less likely to crash.

I know what some of you are thinking: 90 minutes?! I can’t function for 90 minutes without coffee. And I want you to sit with that reaction for a second. Because the fact that you feel that way is actually part of the problem I’m describing.

If the idea of waiting feels impossible, that is data. That is your nervous system telling you how dependent it has become on an external jolt just to feel baseline awake. That’s not normal, and you don’t have to stay there.

Coffee on an Empty Stomach

Timing relative to waking is one thing. Timing relative to food is another.

Coffee is a cortisol stimulator and a gut motility agent, meaning it gets things moving, fast. On an empty stomach, that can mean urgency, cramping, or digestive distress. But it also means this: if your cortisol is already stressed and you’re not yet metabolically fueled, coffee can push your blood sugar in ways you wouldn’t expect.

I’ve had women test this with a continuous glucose monitor and be genuinely shocked. They thought black coffee was totally neutral. And for some people, in a regulated state, it is. But for others, particularly those with some degree of insulin resistance, or who are in a chronic state of fight-or-flight, coffee on an empty stomach will spike blood sugar. Not because of anything you added to it. Because of cortisol’s relationship with glucose.

Cortisol signals your liver to release stored glucose. It’s a survival mechanism preparing you to handle a stressor. If your nervous system already thinks it’s in crisis, coffee is throwing fuel on that fire.

Eating something first, even something small, protein-forward, stabilizes your blood sugar before you add caffeine to the picture. This is especially important for women in perimenopause and menopause, when cortisol sensitivity is heightened and that blood sugar volatility hits harder.

How to Actually Test This on Your Body

Here’s what I want you to do this week, if you’re curious:

• For three days, delay your coffee by at least 60 minutes after waking. Eat or drink some water first. Notice how you feel by mid-morning.

• On days four through six, go back to your usual pattern. Notice the difference.

• If you have a continuous glucose monitor or a blood sugar reader, test your glucose before coffee and 30 minutes after. Run the same test with and without food first. Let the data tell you what your body is doing.

You don’t need to do this perfectly. You don’t need to overhaul your entire morning. Just get curious. Because what your body shows you when you start paying attention is often more informative than anything I could tell you.

Coffee isn’t your enemy. Your morning ritual doesn’t need to be dismantled. But if you’ve been dragging yourself to the coffeemaker the second your alarm goes off and wondering why you still feel exhausted by noon, the timing might be the piece you’ve been missing.

Give your body a chance to wake itself up first. Then let coffee do what it does best: extend and deepen the energy you’ve already built.

-Mindy

References:

^[1] Bowles NP, Thosar SS, Butler MP, et al. (2022). “The circadian system modulates the cortisol awakening response in humans.” Frontiers in Neuroscience, 16:995452.. PMID: 36408390

^[2] Elder GJ, Wetherell MA, Barclay NL, Ellis JG. (2014). “The cortisol awakening response — applications and implications for sleep medicine.” Sleep Medicine Reviews, 18(3):215-24.. PMID: 23835138

^[3] Clow A, Hucklebridge F, Stalder T, Evans P, Thorn L. (2010). “The cortisol awakening response: more than a measure of HPA axis function.” Neuroscience & Biobehavioral Reviews, 35(1):97-103.. PMID: 20026350

^[4] Lovallo WR, Farag NH, Vincent AS, Thomas TL, Wilson MF. (2006). “Cortisol responses to mental stress, exercise, and meals following caffeine intake in men and women.” Pharmacology Biochemistry and Behavior, 83(3):441-7.. PMID: 16631247

^[5] Keijzers GB, De Galan BE, Tack CJ, Smits P. (2002). “Caffeine can decrease insulin sensitivity in humans.” Diabetes Care, 25(2):364-9.. PMID: 11815511

^[6] Flanagan DE, et al. (2009). “Acute caffeine ingestion and glucose tolerance in women with or without gestational diabetes mellitus.” Diabetes Care, PMID: 19497149.. PMID: 19497149