Why You Suddenly Can't Stand the Smell of Coffee (or Eggs, or Cheese)

(Read time <3min)

If you've gone from loving your morning coffee to gagging at the smell of it, you're not broken, and you're not imagining it. Something real is happening in your body, and for most women, it passes.

Megane, our co-founder, went through this in her own way. She's French, and strong cheese has always been one of her great loves, but in her first trimester she couldn't stand it. Eggs too, to the point where just smelling them cooking would make her feel sick. Coffee was different for her though, less of a hard aversion and more of an on-and-off relationship, she still wanted one every other day or so. It wasn't until the second and third trimester that the real pull toward coffee showed up, a genuine craving she noticed and consciously held back on.

We've also heard from customers who describe something more specific: an aversion to coffee that hit hardest right at the tail end of the first trimester, not from the very start. If that's you, you're not off-pattern, you're actually right on the biological timeline.

What's actually happening

A hormone called GDF15 is produced by the placenta in enormous quantities early in pregnancy, rising as much as a thousandfold in the first trimester. It acts directly on a part of the brainstem responsible for nausea and food avoidance. It doesn't negotiate with how much you love your morning cup, it just switches the aversion pathway on.

Coffee has its own specific mechanism on top of that. Pregnancy hormones slow down the liver enzyme responsible for clearing caffeine from your system, so caffeine builds up faster and stays around longer than it used to. That buildup can bring on a racing heart or acid reflux, and your brain quickly learns to associate the smell of coffee with feeling unwell. It's not personal and it's not permanent, it's your body doing exactly what it's supposed to do to protect a pregnancy that's still establishing itself.

Aversions like this typically begin around weeks 5 to 8, peak between weeks 9 and 12, and ease significantly by weeks 12 to 16 for most women, which lines up closely with what our customers describe. As the placenta matures and takes over hormone production more steadily, that intensity fades, and for many women, things slowly start to smell like food again.

The part nobody talks about

Most articles treat this like a quirky pregnancy trivia fact, cute, harmless, something to laugh about with friends. For a lot of women it is exactly that. But if coffee wasn't just a drink to you, if it was the five minutes you had to yourself before the day started, losing that, even for a few months, can feel like one more small thing pregnancy asked you to give up. That's not an overreaction. Pregnancy already asks you to adjust, compromise, and let go of so much. Being allowed to grieve a small daily ritual, even briefly, doesn't make you ungrateful for the bigger thing happening.

This is a big part of why Mama Brew exists in the first place. Helping women hold onto the version of themselves they recognise, even through a season that changes almost everything else, matters to us. When your senses start settling and you're ready to ease back toward coffee, we didn't want the next question to be "how much caffeine is actually in this," we wanted the answer to already be handled.

When you're ready again

There's no fixed date when the aversion lifts, it varies the way Megane's did, gradually, unevenly, sometimes trimester by trimester rather than week by week. When it does start easing and the pull toward coffee comes back, whether that's a gentle curiosity or the stronger craving Megane described later in her pregnancy, you don't need to reintroduce it at full strength to find out if you're ready.

Mama Brew's Decaf sits under 6mg of caffeine per sachet, Low Caff under 30mg, both NHS-compliant and backed by 41 midwife endorsements. Neither asks you to do the maths on whether today's the day you can have coffee again. You just can, whenever your body says yes.