ACOG Committee Opinion 814 + Academy of Nutrition 2016

Vegan vs Vegetarian Pregnancy: What ACOG and the Academy Say

Pregnancy is the life stage where plant-based nutrition discipline matters most. The published guidance from ACOG, the Academy of Nutrition and Dietetics, and the British Dietetic Association all confirm that well-planned vegan and vegetarian diets are safe in pregnancy. This page walks through the specific nutrient targets, the prenatal vitamin checklist, and the eating patterns that meet the guidance.

The short answer. Vegan and vegetarian pregnancies are safe when well-planned. Core supplements for pregnant vegans: B12 (50 mcg cyanocobalamin daily), iodine (150 to 200 mcg), vitamin D (10 mcg), DHA from algae oil (200 mg), choline (450 mg total, deliberately built up through diet plus supplement if needed), iron (27 mg per ACOG, often in the prenatal vitamin). Calcium 1,000 mg from fortified plant milks plus calcium-set tofu. This is not medical advice; consult your obstetric team and a registered dietitian.

The published guidance, in summary

The American College of Obstetricians and Gynecologists issued Committee Opinion 814 in 2021 covering nutrition during pregnancy. The opinion explicitly states that vegetarian and vegan diets can meet the nutritional needs of pregnancy when adequate energy is consumed and specific nutrients are addressed. The same Committee Opinion provides the standard prenatal vitamin guidance applicable to all pregnancies, with specific notes for plant-based eaters on B12, iron, vitamin D, calcium, omega-3, and iodine.

The Academy of Nutrition and Dietetics 2016 position paper on vegetarian diets covers pregnancy and lactation in the appropriate-for-all-life-stages framing. The British Dietetic Association vegan factsheet and the Vegan Society pregnancy guidance both build on the same evidence base. The NHS UK has its own healthy pregnancy diet guidance that does not specifically address vegan eating but provides the underlying recommendations on folate, iron, vitamin D, and food safety.

The headline from all of these: there is no clinical justification for a pregnant vegan to abandon the diet, and no clinical justification for assuming a vegan pregnancy is more difficult than an omnivore pregnancy. The specific nutrient discipline required is real but manageable with a good prenatal vitamin and reasonable food planning.

Nutrient-by-nutrient targets and pregnancy adjustments

Nutrient	Non-pregnant adult	Pregnancy target	Vegan delivery
Energy	2,000 kcal F, 2,500 M	+340 kcal T2, +452 kcal T3	Eat to appetite; energy-dense whole foods if intake low
Protein	0.8 g/kg/day	1.1 g/kg/day plus 25 g/day extra	Tofu, tempeh, legumes at most meals
Folate (folic acid)	400 mcg	600 mcg total (400 supplement)	Supplement, eat leafy greens, lentils
Iron	8 mg M, 18 mg F	27 mg	Prenatal vitamin + lentils, tofu, fortified cereal
Calcium	700 to 1,000 mg	1,000 mg (UK 700)	Fortified soy milk + calcium-set tofu + kale
Vitamin D	10 mcg winter	10 mcg year-round (UK)	Lichen D3 supplement
Vitamin B12	2.4 mcg	2.6 mcg	50 mcg cyanocobalamin daily
Iodine	140 to 150 mcg	200 mcg (UK), 220 mcg (US)	Prenatal with iodine, or 150 mcg supplement
DHA (omega-3)	250 mg EPA+DHA	+200 mg DHA on top	Algae oil supplement
Choline	425 mg F, 550 M	450 mg	Soy, broccoli, quinoa + possible supplement
Zinc	8 to 11 mg	11 mg (+3 mg)	Pumpkin seeds, lentils, tofu

Most of these targets are met by a good vegan prenatal vitamin plus deliberate eating. The B12 dose listed (50 mcg) is higher than non-pregnant guidance because absorption efficiency drops sharply at higher single doses; 50 mcg passes about 1 mcg via intrinsic factor plus a small amount via passive diffusion, which is the appropriate margin for pregnancy.

Trimester-by-trimester eating

First trimester (weeks 1 to 12). Folate is the priority before and during early pregnancy because of neural tube closure (typically by day 28). All women planning pregnancy or in the first trimester should take 400 mcg folic acid daily; some recommend the active form 5-MTHF for women with MTHFR polymorphisms. Energy needs do not yet increase. Morning sickness can dominate; small bland meals win. B12, iodine, and choline matter from conception.

Second trimester (weeks 13 to 28). Energy needs increase by 340 kcal per day. Iron demand rises as blood volume expands; this is when ferritin should be checked if you have not been supplementing. Calcium demand rises as fetal bone development accelerates. Continue all supplements. Appetite usually returns; emphasise nutrient density.

Third trimester (weeks 29 to 40). Energy needs +452 kcal per day. DHA demand for fetal brain development peaks; algae oil supplementation matters most in this window. Iron demand remains high. Calcium for bone mineralisation continues. Choline matters most here per the Caudill 2018 trial. Heartburn can complicate eating; small frequent meals.

Food safety throughout. Pregnant women should avoid raw or undercooked eggs (vegetarians), unpasteurised dairy (vegetarians), pate (vegetarians can find vegan versions), and high-mercury fish (pescatarians: avoid shark, swordfish, marlin, king mackerel; limit tuna). Wash all raw vegetables thoroughly to reduce listeria risk. Avoid unwashed sprouts.

Choosing a vegan prenatal vitamin

Check the label for: vegan certification or explicit vegan suitability; capsule shell made from plant material (tapioca, carrageenan, cellulose) not gelatine; vitamin D3 from lichen not lanolin (or D2 from yeast); B12 in cyanocobalamin or methylcobalamin form; folate as 5-MTHF or folic acid at 400 mcg minimum; iron at 17 to 27 mg; iodine at 150 mcg minimum; vitamin K1; vitamin A predominantly as beta-carotene (preformed retinol above 3,000 mcg can be teratogenic).

UK-available vegan prenatal options (May 2026): Pregnacare Vegan, Vega Pregnancy Multi, Together Health Pregnancy Multi, Wild Nutrition Pregnancy. US-available: Mama Bird Methylated Prenatal, Garden of Life Mykind Prenatal, Ritual Essential Prenatal, FullWell Prenatal Multivitamin. Prices range from around 12 to 50 GBP or USD for a month's supply.

Most prenatals do NOT include choline at meaningful doses (most contain under 50 mg, against a 450 mg pregnancy target). Most do NOT include DHA. If yours does not, add a vegan choline bitartrate supplement and a vegan algae oil DHA supplement separately. This adds roughly 5 to 15 GBP or USD per month.

A vegan pregnancy day, worked example

On waking: prenatal vitamin with water (some women take with food to reduce nausea; both timings work). Algae oil DHA softgel.

Breakfast (around 500 kcal): Bowl of oats made with fortified soy milk, topped with ground flaxseed, walnuts, blueberries, and a tablespoon of peanut butter. Glass of fortified orange juice (for vitamin C-iron absorption synergy and additional calcium if calcium-fortified).

Mid-morning: Apple with a tablespoon of almond butter, or a few medjool dates with cashews. Glass of fortified soy milk.

Lunch (around 600 kcal): Lentil and chickpea curry with brown rice, sauteed kale on the side, slice of sourdough wholemeal bread.

Afternoon snack: Hummus with raw vegetables (red pepper, carrot, cucumber). Pumpkin seeds.

Dinner (around 700 kcal): Tofu and broccoli stir-fry with quinoa, drizzled with tahini. Steamed bok choy on the side.

Evening: Choline supplement if your prenatal does not include enough. A bowl of fortified soy yogurt with berries and chia. Total day: approximately 2,200 to 2,400 kcal, 90 g protein, 1,100 mg calcium, 30 mg iron, comfortably meeting all macronutrient and most micronutrient targets with the supplement bundle handling B12, vitamin D, iodine, DHA, and choline.

This is informational only. Pregnancy nutrition is a clinical area where individual circumstances matter. Work with your obstetric team and ideally a registered dietitian or midwife with plant-based experience. If you have a history of restrictive eating, low BMI, anaemia, or thyroid disease, the standard guidance may need adjustment. See kids and families, breastfeeding.

Related life-stage and nutrient pages

Keep reading

Frequently asked questions about vegan and vegetarian pregnancy

Is a vegan diet safe during pregnancy?

Yes, when well-planned. The American College of Obstetricians and Gynecologists Committee Opinion 814 states that vegetarian and vegan diets can meet the nutritional needs of pregnancy when adequate energy is consumed and appropriate attention is paid to specific nutrients (B12, iron, omega-3 DHA, vitamin D, calcium, iodine, choline, zinc). The Academy of Nutrition and Dietetics 2016 position paper reaches the same conclusion. The British Dietetic Association vegan-in-pregnancy guidance is similar. The key qualifier is well-planned; an unsupplemented vegan diet during pregnancy carries real risk, particularly for infant B12 and iodine status.

What is the most important supplement for a pregnant vegan?

B12 is the non-negotiable one because maternal deficiency causes irreversible neurological damage in the infant. Pregnant vegans should take at least 50 mcg of cyanocobalamin daily (higher than the non-pregnant 10 mcg dose to ensure full saturation of intrinsic factor and adequate passive absorption). Iodine at 150 to 200 mcg per day is the second priority because maternal hypothyroxinaemia in early pregnancy reduces offspring cognitive outcomes (ALSPAC cohort data). Vitamin D at 10 mcg per day, DHA at 200 mg per day from algae oil, and iron at 27 mg per day per ACOG guidance complete the core list.

Do I need a special vegan prenatal vitamin?

Useful but not strictly necessary. Standard prenatal vitamins are typically vegetarian (often using lanolin-derived D3) but may contain gelatine capsules and non-vegan colourings. Vegan-certified prenatal vitamins (Vega Pregnancy, Mama Bird Methylated Prenatal, Vivo Life Prenatal, Pregnacare Vegan) include lichen-derived D3, vegan capsules, and usually contain choline and DHA. Check the label for: lichen D3 not lanolin D3, methylated folate (5-MTHF) preferred, iodine 150 mcg minimum, B12 in cyanocobalamin or methylcobalamin form, algae-derived DHA. If your standard prenatal lacks DHA and choline, add separate supplements.

How much weight should I gain on a vegan pregnancy?

The same range as on any other diet. ACOG and NICE guidance use BMI-based ranges: underweight (BMI under 18.5) 12.5 to 18 kg total weight gain, normal weight (BMI 18.5 to 24.9) 11.5 to 16 kg, overweight (BMI 25 to 29.9) 7 to 11.5 kg, obese (BMI 30+) 5 to 9 kg. Pregnant vegans should not aim for less; underweight maternal status and inadequate weight gain are associated with low birth weight and preterm birth. If you find appetite or eating volume challenging on a high-fibre vegan diet, prioritise energy-dense whole foods (nuts, seeds, nut butters, avocado, dried fruit, tahini).

Should I eat more or less soy in pregnancy?

Moderate soy intake is appropriate and beneficial in pregnancy. The published cohort evidence (Shanghai Women's Health Study and others) does not show harm from typical Asian soy intakes (one to two servings per day) during pregnancy. Soy is a useful protein source, supplies isoflavones with phytoestrogen-like activity that have not been shown to cause harm in pregnancy at dietary doses, and provides complete protein. Avoid high-dose soy isoflavone supplements (above 100 mg per day), which deliver concentrated active compounds outside normal dietary exposure. Whole soy foods (tofu, tempeh, edamame, soy milk) at one to two servings per day are well within safe range.

What about morning sickness on a vegan diet?

Morning sickness affects pregnant women across all dietary patterns; vegans are not at higher risk. The standard management applies: small frequent meals, dry carbohydrates (toast, crackers, plain pasta) on waking, ginger (tea, biscuits, or root), vitamin B6 supplementation if recommended by your GP or midwife, hydration. If meat aversion has nudged you toward more plant-based eating during pregnancy (which is common), the same plant protein staples that work for committed vegans (tofu, lentils, beans, chickpeas) work as morning-sickness-friendly options.

Sources cited. ACOG Committee on Practice Bulletins. Nutrition During Pregnancy, Committee Opinion 814, 2021; Melina V, Craig W, Levin S. Position of the Academy of Nutrition and Dietetics: vegetarian diets, J Acad Nutr Diet 2016; 116: 1970-1980; BDA Vegetarian, Vegan, Plant-based diet fact sheet; Vegan Society pregnancy guidance; Bath SC et al. Effect of inadequate iodine status in UK pregnant women on cognitive outcomes in their children: results from the Avon Longitudinal Study of Parents and Children, Lancet 2013; 382: 331-337; Caudill MA et al. Maternal choline supplementation during the third trimester of pregnancy improves infant information processing speed, FASEB J 2018; 32: 2172-2180; NHS Healthy Diet in Pregnancy. All values as of May 2026.