Food · Patterns
When to eat
The two problems pull in opposite directions. Standard sickness advice is plain, high-carbohydrate, low-fat food. Standard reactive-hypoglycaemia advice is low-glycaemic, protein-paired eating. The reconciliation is pairing and frequency, not choosing a side.
This page was written out of four vault files: Eating patternsProtein pairingNauseaLightheadedness
The eight rules
- Never empty. Roughly every two hours while awake, small. An empty stomach makes nausea worse; a long gap makes the glucose dip worse. One rule fixes both.
- Never go twelve hours without food. Target an overnight fast under ten hours, bridged with a bedtime protein snack.
- Protein first, then the carbohydrate. Fifteen to thirty grams before, not alongside.
- Eat before you sit up, then wait, then stand in stages.
- Water is a real intervention. About 500 ml of plain water gives a measurable effect on standing tolerance. The trigger is low osmolarity, so plain water beats an isotonic drink for this specific reflex.
- On a bad day, composition loses to calories. Use the ladder below.
- Do not restrict carbohydrate. Pregnancy needs at least 175 g a day. The intervention is distribution and pairing, never restriction.
- Eat on a clock, not on appetite. Appetite is an unreliable instrument in the first trimester.
Read the evidence: Eating patterns
The shape of the day
A shape, not a schedule. The times are illustrative; the intervals are the point. Total eating episodes: five to seven. If the sickness is severe, RCOG-aligned practice pushes that to every 90 minutes to two hours.
| When | What | Why | Evidence |
|---|---|---|---|
| On waking, before sitting up | Bedside dry carbohydrate (an oatcake or a plain biscuit) plus a trace of protein: a mini cheese, a few nuts, a few sips of milk. Then wait 15-20 minutes, then sit, then stand. | An overnight glucose trough, an empty stomach and a fast postural change is the classic morning-collapse setup. | Read the evidence · Eating patterns |
| 30-45 minutes after waking | Breakfast with a protein anchor: Greek yoghurt, eggs, cottage cheese, or porridge made with milk plus nut butter. Before any caffeine. | Skipping or delaying breakfast in pregnancy accelerates the drift into ketones and low glucose. Caffeine on an empty stomach amplifies both the shakiness and the postural symptoms. | Read the evidence · Eating patterns |
| Mid-morning, about two hours later | A small paired snack: fruit and nuts, crackers and cheese. | The two-to-four-hour window after breakfast is where the reactive dip lands. | Read the evidence · Eating patterns |
| Lunch | Protein-anchored. Carbohydrate present, but never naked. | Read the evidence · Protein pairing | |
| After lunch | A short walk, if she can face it. | Post-meal movement is part of the package that lets up to eighty per cent of women with gestational diabetes hit glycaemic targets without medication. On a bad nausea day, skip it without guilt. | Read the evidence · Gestational diabetes |
| Mid-afternoon, about two hours later | A small paired snack. This is the highest-risk slot in the whole day. | Classic reactive-hypoglycaemia timing: the shaky, spacey, need-sugar-now episode. | Read the evidence · Lightheadedness |
| Dinner | Protein-anchored. Cold or room temperature if cooking smells are a problem. | Cold food gives off far less aroma. The NHS and NICE both recommend cold over hot in pregnancy sickness. | Read the evidence · Nausea |
| Bedtime, within an hour of sleeping | About 10-15 g of protein with 15-30 g of carbohydrate. Greek yoghurt; cheese and oatcakes; milk and two biscuits; nut butter on a rice cake. | This is what shortens the overnight fast. Conventional dietetic practice rather than trial-proven, but the accelerated-starvation physiology behind it is well established. | Read the evidence · Eating patterns |
| If she wakes in the night | One bedside item and some sips of water. Lights off. Do not get up hungry. | Getting up to the loo is near-universal and makes a natural checkpoint. Use it. | PracticalRead the evidence · Eating patterns |
The never-empty-stomach rule
The single highest-yield behaviour in this file, and the one most often broken by accident.
The loop, and where it starts
The failure mode is not choosing badly. It is not eating at all. Someone who feels too sick to eat gets sicker, because emptiness worsens the nausea. Then the glucose dips, which adds shakiness and lightheadedness, which further kills the appetite. It is a loop with a single entry point: eat before it gets bad.
Read the evidence: Eating patternsNausea
Four things that follow from it
- Set an alarm. A repeating two-hour phone alarm labelled “eat something small” is a legitimate clinical intervention here.
- Small beats large. Large meals worsen nausea and produce bigger glucose excursions. The same food in six pieces behaves completely differently from the same food in three.
- The ten-hour overnight ceiling. Dinner at 8pm and breakfast at 9am is thirteen hours. The bedtime snack closes that gap.
- A pre-emptive snack beats a rescue snack. Once she is already shaky the fast-carb rescue is necessary, but that rescue is itself part of the cycle.
Practical The alarm and the restocking habit are behavioural scaffolding, not findings. The claims underneath them (meal size, the overnight ceiling, the rescue cycle) are in Eating patterns.
Before standing up: the morning protocol
Three separate things go wrong on waking. Handle all three or the fix does not hold.
Glucose is at its overnight trough
Eat the bedside snack lying down. Carbohydrate plus a protein trace, not carbohydrate alone.
Read the evidence · Eating patternsSickness is worst on waking
The same snack, 15-20 minutes before moving. The waiting is not optional; it is the whole intervention.
Read the evidence · NauseaPressure is genuinely lower
First-trimester blood pressure falls by about ten per cent while plasma volume is only up six per cent. Hence the water and the staged stand.
Read the evidence · LightheadednessThe stand itself
- Sip water from the bedside bottle, up to about 500 ml if she can. Plain water, not squash and not an isotonic drink: the reflex works through low osmolarity.
- Ten ankle circles or calf squeezes while still lying down.
- Sit on the edge of the bed and count to twenty or thirty.
- Stand slowly, with a hand on something.
- Do not stand still afterwards. Static standing is worse than walking.
The same protocol applies after a hot shower, after sitting for a long time, and before anything that involves queueing. Heat is a vasodilator, so a 500 ml bolus fifteen minutes before a known provocation is the pre-emptive version.
Read the evidence: LightheadednessEating patterns
Hydration
| Situation | What to do |
|---|---|
| Baseline | Steady sipping through the day rather than large boluses. Better tolerated with nausea, and more of it is retained. |
| With meals | Separate fluids from food: sip between eating episodes rather than drinking with them. |
| Before a known provocation | About 500 ml of plain water, fifteen minutes before. This is the one time a big bolus is right. |
| If vomiting is significant | Plain water alone is not enough. Oral rehydration salts are the sensible middle ground before intravenous fluids. |
| Suspected electrolyte problems | Do not self-treat with salt loading. The picture in hyperemesis is low sodium and low potassium, and guessing is how people get it wrong. Get it measured. |
| Monitoring | Aim for pale straw urine. Very dark urine, or none for eight hours, is a same-day call. |
| What not to use as a check | Ketone sticks. Dropped by the RCOG in 2024. Ketones are not an accurate indicator of dehydration. |
Read the evidence: Eating patternsNausea
Drink temperature and character: NHS advice suggests avoiding drinks that are very cold, tart or sweet if they trigger symptoms, though many people find cold water the only tolerable fluid. Test it. There is no rule here worth suffering for. Caffeine stays at or below 200 mg a day, and never on an empty stomach: it amplifies both the shakiness of a glucose dip and the postural symptoms.
Bad-day harm-reduction ladder
On a day when only plain carbohydrate stays down, the goal is no longer glucose optimisation. It is calories, fluid, and not entering the vomiting-dehydration-hypoglycaemia spiral. Work down the ladder only as far as you need to. Every rung is a legitimate place to stop.
Two rules that apply on every rung
- Keep the fluids going even if the food fails. Dehydration is what converts a bad day into an admission.
- Start the anti-sickness medication conversation early. The 2024 RCOG guideline is explicit that first-line antiemetics should be prescribed when they are needed. Being offered nothing is not acceptable.
Read the evidence: NauseaEating patterns
An acute low: what to do in the moment
Shaky, sweaty, palpitations, spacey, irritable, suddenly ravenous. Typically two to four hours after a carbohydrate-heavy meal.
Read the evidence: LightheadednessEating patterns
- Sit down first. If it does not settle, lie down on the left side. Get low before you fall.
- Fast carbohydrate to rescue it: juice, a few sweets, glucose tablets. This is the correct use of a fast carbohydrate.
- Immediately follow it with a paired snack: cheese and crackers, nuts, yoghurt. Without the follow-up, the rescue carbohydrate produces the next dip.
- Log it: the time, how long since the last food, what that food was, the position she was in, and the symptoms. Three episodes with the same three-hours-after-a-meal signature is a pattern worth showing a clinician.
- Then fix it upstream. Repeated rescues mean the previous meal needed more protein and less naked carbohydrate, or the gap was too long.
What not to do
- Do not cut carbohydrate. Pregnancy needs at least 175 g a day, and the PCOS and gestational-diabetes guidance is explicit that pregnancy is not the time for carbohydrate restriction. Distribute and pair instead.
- Do not chase a protein total. The UK increment is +6 g a day. Distribution across the day is the whole game.
- Do not skip breakfast, including for convenience before a morning appointment. Skipped breakfast in pregnancy has a specific, measured metabolic cost. If she is fasting for a glucose tolerance test that is a clinical instruction and it overrides this, but plan the rest of that day around it.
- Do not salt-load for low blood pressure without measured electrolytes.
- Do not use ketone sticks to judge hydration or severity.
- Do not drink juice or a fruit smoothie on an empty stomach. The single worst naked carbohydrate available.
- Do not push through a near-faint. A controlled sit beats an uncontrolled collapse.
- Do not let eating perfectly become another source of stress. On a bad day, rung 5 is a success.
Read the evidence: Eating patternsProtein pairingLightheadedness
What to log
Three weeks of this makes a midwife appointment far more productive.
| Column | Why it earns its place |
|---|---|
| Time of each eating episode | Reveals the accidental five-hour gaps. |
| What it was, and whether it was paired | Separates “she ate” from “she ate a naked carbohydrate”. |
| Time since last food when a symptom hit | The two-to-four-hour signature is what identifies reactive hypoglycaemia. |
| Position when a symptom hit | Separates a postural drop from a glucose dip. |
| Sickness score | Converts “I feel awful” into a number that has to be acted on. |
| Overnight fast length | The one number that predicts a bad morning. |
| Urine colour, and any eight-hour gaps | Hydration, and the escalation trigger. |
Practical A logging template rather than a claim. What makes each column worth recording (the two-to-four-hour signature, the overnight-fast ceiling, the PUQE score) is set out in Eating patterns and Nausea.