When you are pregnant, there are some foods you can't eat and others that help you stay well, put on the right amount of weight and support your baby to develop well.
Key points about eating, drinking and watching your weight during pregnancy
- Eating a healthy balanced diet when you are pregnant is important for you and your baby.
- The best fluid to have when you are pregnant is water.
- It is not recommended you take supplements other than folic acid and iodine.
- Although it's important to eat a wide variety of foods to get the nutrients you and your baby need during pregnancy, you also need to avoid or limit some foods as they can cause harm to you and your baby.
- Putting on weight during pregnancy is normal. However, you need to gain the right amount of weight for your body size for a healthy pregnancy, normal birth and healthy baby.
- Talk to your doctor, midwife or dietitian if you need advice on healthy eating and watching your weight during pregnancy.
How do I keep my diet healthy and balanced while I am pregnant?
During pregnancy your appetite can be affected by pregnancy-related issues such as morning sickness, indigestion or having cravings for unhealthy foods. However, eating a healthy balanced diet is important for you and your baby.
Make sure you eat a variety of foods including:
- plenty of vegetables and fruit
- grain foods, mostly whole grain and those naturally high in fibre
- some milk and milk products, mostly low and reduced fat some
- legumes, nuts, seeds, fish and other seafood, eggs, poultry and/or red meat with the fat removed.
Other tips to eat healthily during pregnancy include:
- having small, regular healthy meals and snacks and drinking plenty of fluids (water is best)
- avoiding fatty or spicy food if you have nausea or indigestion
- your family or whānau supporting you by preparing meals for you
- distracting yourself from your pregnancy cravings for less healthy foods by chewing sugarless gum or having a hot drink or healthier snacks.
Do I need to take any supplements during pregnancy?
The only supplements you need to take during pregnancy are:
- a folic acid-only tablet – 800 micrograms per day from 4 weeks before you are pregnant until the 12th week of your pregnancy
- an iodine tablet – 150 micrograms from the start of your pregnancy until you stop breastfeeding.
It is not recommended you take supplements other than folic acid and iodine (such as multivitamins for pregnancy) and you must only take supplements on the advice of your doctor or midwife. Talk to your doctor, midwife or dietitian if you think you may have any nutrient deficiencies. If you are a vegan, your healthcare team may advise you take vitamin B12 supplements.
Read more about avoiding nutrient deficiencies during pregnancy.
Which foods do I need to avoid or limit during pregnancy?
Although it's important to eat a wide variety of foods to get the nutrients you and your baby need during pregnancy, you also need to avoid or limit some foods as they can cause harm to you and your baby. In pregnancy your immunity is lower so you and your unborn baby are more susceptible than usual to food-borne illnesses that affect everyone.
Bacteria such as listeria, salmonella and campylobacter and pathogens such as toxoplasma can cause food-borne illness. When you are pregnant, this can cause infection in you and your baby. In extreme cases, this can cause complications such as miscarriage, stillbirth or premature birth.
Foods to avoid during pregnancy for this reason include:
- chilled ready-to-eat foods such as those bought from a supermarket deli or restaurant buffet unless they are heated until piping hot
- prepared ready-to-eat foods such as store-bought sandwiches where you can’t be certain of product age, storage conditions or the preparer’s food-handling practices
- soft and semi-soft pasteurised cheese, eg, brie, camembert, feta, blue, mozzarella and ricotta
- raw milk (unpasturised), raw milk cheeses and raw milk yoghurts
- cold cooked or smoked chicken
- processed meats such as ham, pâté, salami and luncheon
- prepared salads including rice or pasta salad, coleslaw, roasted vegetable and green salads
- raw or smoked seafood including sushi, smoked salmon, marinated mussels or oysters
- raw eggs, eg, in smoothies, mayonnaise or desserts like mousse
- soft serve ice cream
- cream or custard especially in pre-made cakes or pastries (unless newly opened or homemade and fresh)
- hummus and other dips containing tahini (which has been linked to both salmonella and listeria infection)
- any food prepared and stored in the fridge for more than 12 hours.
Other than avoiding the foods above, you should practice the following when you are pregnant:
- wash your hands with soap and water after being around animals
- protect yourself against exposure to cat litter
- wear gloves while gardening.
Drinks to avoid or limit include:
- drinks that contain caffeine (eg, energy drinks, cola, coffee)
- herbal teas
- fermented drinks
- sugary drinks
You need to limit caffeine intake to below 200mg per day when you are pregnant as it takes longer for caffeine to clear from the blood of a pregnant woman compared with other adults. High caffeine intake can increase the risk of miscarriage, stillbirth and having a baby with low birthweight. Energy drinks and energy shots have high caffeine content, so it's best if you don't drink these while pregnant.
The diagram below shows the approximate caffeine content in each drink.
Image: Eating and activity guidelines for New Zealand adults Ministry of Health, NZ
Some herbal teas may be harmful in pregnancy, such as aloe, buckthorn bark, chamomile, coltsfoot, comfrey, juniper berries, Labrodor tea, lobelia, pennyroyal, sassafras and senna leaves (alpine tea). Therefore, avoid these teas if you are pregnant or breastfeeding.
Some fermented drinks such as kombucha, kefir or kvass can contain low levels of alcohol. If you are pregnant or breastfeeding, it is best to avoid alcohol and any alcohol-containing drinks. Read more about alcohol and pregnancy.
You also need to avoid sugary drinks, because when you are pregnant high amount of hormones such as oestrogen and progesterone can make bacteria grow in your mouth, causing gum inflammation (pregnancy gingivitis). Therefore, good oral health such as brushing and flossing your teeth twice a day is also important.
How much weight gain is appropriate while I am pregnant?
Although women feel hungrier in pregnancy, eating for two is not necessary. Nor is it a time to diet, so let your appetite guide you. If you feel hungry, healthy snacks like yoghurt, fruit, washed vegetable sticks, nuts, wholegrain crackers and cheese, and fruit smoothies are great options.
Putting on weight is natural and will help you breastfeed well. The extra weight often comes off when breastfeeding if you maintain a balanced diet. The weight gained in pregnancy is caused by your developing baby, placenta and the amniotic fluid, along with increases in volume of your own body (uterus, breasts, blood and cell fluid and fat stores).
Too much weight gain during pregnancy can increase the chances of high blood pressure, gestational diabetes and having a big baby. Having a big baby can lead to birth complications. Too little weight gain during pregnancy can cause premature birth and a low birthweight baby. Gaining the right amount of weight for your body size increases the chances of you having a healthy pregnancy, normal birth and a healthy baby.
It is not recommended to lose weight during pregnancy.
Keeping track of how much weight you gain is an important part of your pregnancy. The amount of weight you should gain depends on your weight before getting pregnant. If you know your normal pre-pregnancy weight, you can calculate your BMI (body mass index) and use the table below to work out what a healthy weight gain should be for you.
Recommended weight gain according to pre-pregnancy BMI
Recommended total weight gain
Underweight (under 18.5)
Healthy weight (18.5 to 24.9)
Overweight (25 to 29.9)
Obese (above 30)
Source: Eating and activity guidelines for New Zealand adults, Ministry of Health, NZ
How do I achieve healthy weight gain during pregnancy?
Here are some tips to help you achieve healthy weight gain when you are pregnant:
- Eat healthy foods and keep active.
- Drink water rather than sweetened drinks or fizzy drinks.
- You don’t need extra food when pregnant or to ‘eat for two’ even if you are overweight.
- In the first 12 weeks of pregnancy, aim to eat the same amount as usual, focusing on nutrient-rich foods.
- From 12 weeks of pregnancy onwards, you may need extra energy to support your baby’s growth. You can add an extra healthy snack during the day or extra healthy food to a meal.
When should I see my healthcare team about eating and weight gain during pregnancy?
Your doctor, midwife or dietitian can advise you on the energy requirements that are right for you. They can also ensure the quality of your diet is the best it can be for your pregnancy – quality is every bit as important as quantity.
If you have a BMI that is below 18.5 or above 30 at the start of pregnancy, or you are worried that you are not getting enough nutrients, talk to your doctor, midwife or dietitian for some advice on healthy eating.
The following links provide further information about eating, drinking and watching your weight during pregnancy. Be aware that websites from other countries may have information that differs from New Zealand recommendations.
Pregnancy nutrition Plunket NZ
Eating for healthy pregnant women Ministry of Health, NZ
Eating safely and well during pregnancy Ministry of Health, NZ
Healthy weight gain during pregnancy Ministry of Health, NZ
Healthy weight gain in pregnancy HealthInfo Canterbury, NZ
- Eating and activity guidelines for New Zealand adults Ministry of Health, NZ, 2020
- Guidance for healthy weight gain in pregnancy Ministry of Health, NZ, 2014