Nutrition
Pregnancy with a medical condition
Pregnancy alongside diabetes, hypertension, kidney or thyroid disease needs joint obstetric and dietetic care — not general pregnancy advice.
What you are aiming for
- Meet raised needs for folate, iron, iodine, calcium and protein
- Keep the underlying condition well controlled, which matters more than any single food
- Achieve appropriate weight gain for your starting BMI
- Eat safely to avoid listeria, toxoplasma and mercury exposure
Build meals around
- Folic acid supplement before conception and through the first trimester — a higher dose in diabetes
- Iron-rich foods with vitamin C to aid absorption
- Calcium and vitamin D daily
- Two portions of fish weekly, one oily, avoiding high-mercury species
- Regular meals with protein and low-glycaemic carbohydrate, particularly in gestational diabetes
Limit or avoid
- Unpasteurised dairy, soft mould-ripened cheese, pâté, raw or undercooked eggs and meat
- Shark, swordfish and marlin; limit tuna
- Alcohol entirely; caffeine to about 200 mg a day
- Liver and vitamin A supplements
- High-salt foods where blood pressure is a concern
Meal timing
- Small frequent meals help nausea in early pregnancy and glucose control later.
- In gestational diabetes, keep breakfast carbohydrate small — glucose tolerance is lowest in the morning.
- Have a bedtime snack if morning ketones or hypoglycaemia are a problem.
Portions
- You do not need to eat for two — extra energy is needed only in the later trimesters, and modestly.
- Spread carbohydrate across three meals and two to three snacks in gestational diabetes.
A sample day
- BreakfastEggs with wholegrain toast; small glass of milk
- SnackYoghurt with berries
- LunchLentil salad with leafy greens and wholegrain bread
- SnackApple with peanut butter
- DinnerSalmon with sweet potato and broccoli
- BedtimeMilk and a small oatcake
Common myths
“Gestational diabetes means cutting out all carbohydrate.”
The baby needs carbohydrate. Type, portion and spacing are what change — with monitoring to guide it.
“Cravings indicate a nutrient deficiency.”
There is no good evidence for this. Persistent craving for non-food items does need medical review.
Treatment-related challenges
- Severe nausea and vomiting may need medical treatment, not just dry crackers.
- Iron supplements commonly cause constipation — increase fluid and fibre, ask about alternatives.
- Existing diabetes needs much tighter targets and specialist input from before conception.
See a registered dietitian if
- · Gestational diabetes, or pre-existing diabetes in pregnancy
- · Kidney, liver or thyroid disease in pregnancy
- · Poor weight gain, hyperemesis, or a restrictive diet
Afya Companion offers education and self-help support. It does not diagnose, treat or replace care from your doctor, nurse, psychologist or dietitian. If something in your health changes, speak to your care team.