What the guideline actually says

NICE's intrapartum guideline has a short section on eating and drinking, and it is worth quoting in full because it is routinely misremembered in both directions.

On drinking: "Explain to the woman or pregnant person that they should drink during labour when they are thirsty, and that isotonic drinks may be more beneficial than water. Also explain that there is no benefit to drinking any more than normal, and overconsumption may be harmful."

On eating: "Inform the woman or pregnant person that they can eat a light diet in established labour if they wish, unless they have received opioids or they develop risk factors that make a caesarean birth more likely."

So the default is that you may eat and drink. There are two named exceptions, and there is a caution about overdoing the fluids that most people have never heard.

The two exceptions, explained

You have had opioids

Pethidine, diamorphine and remifentanil slow the stomach down and make nausea and vomiting more likely. Once you have had one, the advice on eating changes. This is worth factoring into the decision when pain relief is being discussed — not as a reason to refuse it, but so that the sandwich decision happens before the injection rather than after.

You develop risk factors that make a caesarean more likely

The concern is general anaesthesia and a full stomach. Most caesarean births are done with a spinal or epidural rather than a general anaesthetic, which is why the restriction is tied to the likelihood of caesarean rather than applied to everyone from the door.

In practice this means that if labour is going straightforwardly, food is not restricted; if things change, the advice changes with them. It is reasonable to ask your midwife directly: has anything changed about whether I can eat?

The part nobody expects: you can drink too much

NICE is unusually blunt about this, because the harm is real. Its information for women in labour includes that "excessive intake of oral or intravenous fluids may be harmful as this can cause hyponatraemia (a sodium level of less than 130 mmol/L in a pregnant woman or pregnant person) and lead to maternal and neonatal seizures or death".

It also instructs staff to act if "there are any concerns about fluid intake, for example the woman or pregnant person is drinking too much".

This runs directly against the well-meant advice to sip constantly through labour. NICE's position is: drink when thirsty, and no more than normal. Thirst is the instruction, not a target.

Relatedly, NICE now says: "Do not routinely advise oral fluids or give intravenous fluids for the treatment of ketonuria in women and pregnant people who are not diabetic." Ketones in a urine sample during labour used to trigger fluids or a drip. That is no longer recommended on its own.

What to eat and drink in early labour

The latent phase is when eating is easiest and matters most. The NHS: "During the latent stage, it's a good idea to have something to eat and drink because you'll need energy for when labour is established." Its list for the beginning of labour includes drinking fluids — "you may find sports (isotonic) drinks help keep your energy levels up" — and having a snack if you feel like it.

Tommy's is more specific and more realistic: "Drink plenty of water and have small snacks, such as toast, biscuits or a banana, to keep your energy levels topped up. Be aware that many people do not feel very hungry and some feel, or are, sick. If you do not feel like eating then try sipping an isotonic drink instead."

That last sentence matters. Not being hungry in labour is normal, and an isotonic drink is the recommended fallback rather than a forced sandwich.

What actually works, practically

Things you can eat one-handed between contractions: toast, bananas, cereal bars, crackers.
Things that do not need chewing when you feel sick: yoghurt, smoothies, ice lollies.
Isotonic sports drinks, named specifically by both the NHS and NICE.
A straw and a bottle you can hold at odd angles.
Snacks for your birth partner, separately. They will need to eat and should not be leaving to find food.

Pack all of it. Hospital catering does not run to labour timetables. The HSE's advice for setting off is to bring your antenatal card or pregnancy notes and your bag, and Tommy's suggests double-checking the hospital bag as one of the first things to do once labour starts — which is the moment to put the snacks in it.

Why the old rule is remembered

Plenty of people arrive expecting to be told they cannot eat. That expectation comes from an older era of obstetric anaesthesia, when general anaesthesia was far more common for caesarean birth and the risk of aspirating stomach contents drove blanket restrictions.

The current position is targeted rather than blanket: the restriction attaches to opioids and to the likelihood of caesarean, which is where the anaesthetic risk actually lies. If you are told you cannot eat, it is fair to ask which of those two applies.

If you are having an epidural or a planned caesarean

An epidural does not automatically stop you drinking, but it changes what is being monitored, and NICE requires that fluid intake and output are watched. For a planned caesarean, fasting instructions come from the anaesthetic team and are specific to the timing of your operation — follow those rather than anything on a general page.

When to call someone

Your midwife or maternity unit if you cannot keep fluids down at all during labour, or are being repeatedly sick.
Your midwife, in the room, before eating anything after opioid pain relief, and again if anything about the plan changes.
Urgently if your waters break, you have bleeding, your baby is moving less than usual, or you are under 37 weeks (NHS).
Your midwife if you feel confused, unusually unwell or develop a headache after drinking large volumes — NICE names low sodium as a genuine harm of overconsumption.

The short version

Drink when thirsty, isotonic rather than water if you want the energy, and no more than you normally would. Eat a light diet in established labour unless you have had opioids or a caesarean has become more likely. Eat in the latent phase while you still can, and know that not feeling hungry is normal rather than a problem to solve.

Eating and Drinking in Labour