How Your Diet Affects Milk Supply: A Simple Guide for New Mums

Right, let’s start with the thing I most want you to hear: you are almost certainly not eating yourself into a low milk supply.

I know that might sound blunt, but I say it because the amount of anxiety I see around food and breastfeeding is significant, and most of it is misplaced. New mums are already dealing with so much, and adding a layer of nutritional stress — am I eating enough salmon? Should I be taking that supplement? Did the glass of wine I had ruin everything? — is rarely helpful.

So here’s an honest, no-fuss guide to food and breastfeeding.

Does what you eat affect your milk supply?

Yes and no. The most important factor in milk supply is how often milk is being removed from your breasts — through feeding or pumping. Diet plays a supporting role, but it’s not the main driver. What does matter nutritionally is that you are eating enough overall. Breastfeeding burns a significant number of calories — estimates vary, but somewhere in the region of 400 to 500 extra a day. If you’re significantly under-eating over a sustained period, that can affect supply. But this isn’t about counting calories or eating perfectly. It’s about not skipping meals and making sure you’re eating something regular.

What should you eat while breastfeeding?

Nothing exotic. The same balanced approach that serves you at any other point in life: plenty of vegetables, protein, wholegrains, healthy fats, and lots of fluid. Water is particularly important — staying well-hydrated supports milk production, and many breastfeeding mums find they’re thirsty frequently, especially during or after feeds.

Iron-rich foods are worth prioritising after birth, particularly if you lost significant blood. Lean red meat, lentils, leafy greens and fortified cereals all help. Similarly, calcium matters — dairy or dairy alternatives, leafy greens, and fortified foods. A breastfeeding-specific multivitamin can be a useful safety net, particularly Vitamin D, which Public Health England recommends all breastfeeding women supplement.

Are there foods to avoid?

Not really. There is no blanket list of foods you must cut out while breastfeeding. Some babies do seem sensitive to something in their mother’s diet — usually dairy or caffeine are the first suspects — but this is a reaction to that specific baby’s sensitivities, not a general rule. Caffeine in moderate amounts (two to three cups of coffee a day) is generally considered fine. Alcohol in very small amounts is generally considered low-risk, particularly if you feed your baby before you drink and allow a couple of hours before the next feed. If in doubt, the NHS guidance is clear and worth reading.

What about galactagogues — foods that boost supply?

You may have seen oat-based lactation cookies, fenugreek supplements or blessed thistle marketed as supply-boosters. The evidence for most of these is pretty limited. They might help, they might not, and for some people certain supplements (fenugreek in particular) can actually reduce supply in higher doses. If you have genuine concerns about supply, please speak to your midwife, health visitor or a lactation consultant rather than heading to Amazon. There’s a lot of noise online about this topic and not much of it is evidence-based.

The simplest advice I can give

Eat regularly. Drink plenty of water. Accept help so that you can actually find time to eat. Don’t spiral about doing it perfectly — your body is remarkable and it wants to feed your baby. Support it with the basics and try to trust it.

And if you’re really struggling, please reach out. I’m always happy to chat, and I can point you to the right local support in Surrey if needed. 💛