GLP-1s, PMOS (formerly PCOS) and fertility... where does nutrition fit in?

Written by Nick Nation Accredited Practising Dietitian and Certified Fertility Dietitian

GLP-1s, PMOS and fertility... where does food fit in?

If you've got PMOS and you're trying for a baby, you've probably seen the headlines about Ozempic and the "Ozempic babies." Maybe your GP has even raised a GLP-1 with you. And you're left wondering... is this a shortcut, or a shortcut to trouble?

Let me meet you where you are. These medications are genuinely exciting for some women. The newer trial data is showing that when weight and insulin resistance improve, ovulation can come back and reproductive markers head in the right direction. That's a big deal when you've spent years trying to lose weight to better manage your PMOS.

But here's where I put my dietitian hat on. A GLP-1 like Ozempic, Mounjaro, or Wegovy work on the symptom side... appetite, weight, blood sugars. It doesn't automatically fix the foundations your body needs to make and grow a baby. That's the bit food does. And that's the bit that gets forgotten when the appetite switch gets turned down.

Don't let a smaller appetite decide how much you nourish yourself

This is where I'll push back on the advice you'll hear everywhere else. GLP-1s work partly by making you feel full on far less food. So the natural thing is to just eat less of everything. And that's exactly where the nutrition quietly falls away... less iron, less protein, less folate, less iodine, less calcium. Think of your appetite like the delivery driver bringing nutrients to the building site. On a GLP-1, the driver's showing up less often. If we let that decide the whole job, the site runs short, and the job takes longer.

So my take is the opposite of "eat less." I actually encourage the women I work with to gently eat a little past their appetite, to make sure enough good food gets in. Not stuffing yourself. Just not stopping short of what your body actually needs, especially when we're building toward a pregnancy. The one condition... keep the meals balanced. Protein, colourful plants, quality carbs, healthy fats. Eating past your appetite only helps if it's real nourishment going in.

The taper-off conversation nobody prepares you for

This is the one I really want on your radar, because it catches so many women off guard. GLP-1s generally aren't used during pregnancy. So, at some point there's a plan to come off the medication before you conceive, and the when is your prescriber's call, not something to guess at or stop suddenly on your own. Ask them early. How long before trying? Any washout period? What does the wind-down look like? Get it mapped out well ahead of time, not the week you decide you're ready.

Here's why food (and resistance training) is the whole game in this window. When the medication steps away, appetite often comes roaring back, and if there's no plan underneath, that's where the weight can rebound and the old patterns creep back in. That's not a willpower failure. That's biology doing exactly what it does. Where you can, it's worth giving yourself a bit of runway... time to taper off and let your eating settle before you conceive, rather than coming off the medication and falling pregnant in the same breath. A sharp rebound in weight through the first trimester can add to the risks already linked with higher weight in pregnancy, so a steadier landing is the goal wherever it's realistic.

Now... I'll be honest, that's not always on the cards. Sometimes age and the fertility clock mean you simply can't wait months to optimise everything first. That's a real and valid trade-off, and it's one to weigh up openly with your specialist, not a reason to feel you've done anything wrong. We just work with the runway you've actually got.

So we don't wait for the taper to start the work. In the lead-up, we're building the habits that hold: regular balanced meals, a protein rhythm you don't have to think about, foods you actually enjoy. That way, when your appetite returns, it's landing on solid ground instead of an empty plan. And be kind to yourself through it. Watching the appetite come back can feel scary after months of it being quiet. That fear is normal, and it's a lot smaller when you've got real scaffolding to stand on.

The take-home

A GLP-1 can be a genuinely helpful tool alongside your medical team, not a magic wand and not a villain. Work closely with your GP or specialist on the medication, plan the taper early, and let's make sure the nutrition underneath it is solid so your body's ready.

Nick Nation is an Accredited Practising Dietitian and founder of Nutrition Nation in Perth, specialising in women's health, fertility, PCOS/PMOS and endometriosis. Nutrition support works best alongside your GP and specialist, not in place of them.