In recent years, a growing body of research has brought new attention to the importance of nutrition in the months before, during and after pregnancy. Fertility journeys, pregnancy outcomes, and long-term health for both mother and child can be influenced by nutritional status during this period.
When conventional fertility interventions may feel overwhelming or inaccessible, focusing on nutrition can offer a practical way to support overall health. It should sit alongside, not replace, appropriate fertility or maternity care.
Understanding the First 1,000 Days
The phrase First 1,000 Days is conventionally used for the period from conception to a child’s second birthday. Preconception health is also important, but the months before conception are not usually counted within that literal 1,000-day definition.
Environmental factors including nutrition can influence development through biological mechanisms including epigenetic processes. The preconception window is worth attention because eggs and sperm develop over time and because entering pregnancy with adequate nutrient stores matters for maternal health.
The evidence: what the NiPPeR study actually showed
A prespecified analysis of the NiPPeR trial found that more than 90% of participants had a marginal or low laboratory status for at least one of folate, riboflavin, vitamin B12 or vitamin D before conception. The trial involved women in the UK, Singapore and New Zealand, so it should not be treated as a prevalence estimate for every woman in every high-income country.
The specific enhanced supplement tested in NiPPeR improved several vitamin-status markers. However, the main trial did not show a difference in its primary outcome of gestational glycaemia, and a secondary analysis found no improvement in time to natural conception or clinical pregnancy rates. Nutrition matters, but one supplement should not be presented as a fertility guarantee.
How nutrition supports preconception and pregnancy
A varied, nutrient-dense diet
Colourful fruit and vegetables, whole grains, pulses, nuts, seeds, dairy or suitable alternatives, eggs, fish and other protein sources can help provide nutrients needed before and during pregnancy. Antioxidant-rich foods are part of a healthy diet, but claims that individual foods directly improve egg quality, prevent miscarriage or prepare the uterus for implantation go beyond what can be promised from current evidence.
Building iron stores
Entering pregnancy without iron deficiency is useful because iron requirements rise during pregnancy and iron-deficiency anaemia can cause tiredness and other problems. Plant sources of iron include beans, lentils and leafy greens; meat also provides haem iron, which is more readily absorbed. Vitamin C can help absorption of non-haem iron.
Folate, vitamin B12 and choline
Folate and vitamin B12 are important nutrients in pregnancy, and choline also has roles in development. In the UK, the key public-health recommendation is clear: NHS guidance advises taking 400 micrograms of folic acid every day before pregnancy and until 12 weeks pregnant, unless a clinician recommends a higher dose. Food sources of folate are useful, but they do not replace the recommended folic acid supplement.
People following vegan or restrictive diets may need specific advice about nutrients such as vitamin B12. NHS guidance also recommends vitamin D according to current pregnancy guidance and advises avoiding supplements containing vitamin A in the form of retinol during pregnancy.
A practical preconception meal
A meal such as salmon with a range of vegetables and a lemon-and-olive-oil dressing can provide protein, omega-3 fats and a mix of micronutrients. It does not need to be “perfect” to be useful, and foods do not need to be organic to form part of a healthy pregnancy diet.
Pregnancy: nourishing two lives
Pregnancy brings major physiological and nutritional demands. A healthy, varied diet helps provide most vitamins and minerals, alongside supplements recommended in UK pregnancy guidance.
Key pregnancy focus areas
- Fibre and variety: vegetables, fruit, pulses, nuts, seeds and whole grains can support digestive health.
- Healthy fats: oily fish can provide omega-3 fats, while following NHS guidance on portions and fish to avoid during pregnancy.
- Food safety: follow NHS pregnancy food-safety guidance rather than assuming “natural” or unprocessed automatically means safer.
An easy pregnancy breakfast idea
Overnight oats with seeds, nut butter, pasteurised milk or a suitable alternative, yoghurt and berries can provide fibre, protein and a range of nutrients. Adjust ingredients for allergies, dietary preferences and pregnancy food-safety guidance.
Postpartum: the overlooked fourth trimester
The postpartum period can be demanding. Recovering from birth, feeding a baby and interrupted sleep can all increase the practical challenge of eating regularly and meeting nutritional needs.
Useful priorities can include:
- Regular, nutrient-dense meals: choose foods that are realistic, enjoyable and easy to access rather than chasing a “perfect” recovery diet.
- Iron: significant blood loss can increase the risk of iron deficiency; if you are unusually tired or concerned about anaemia, speak to a healthcare professional rather than self-treating.
- Vitamin D: NHS guidance advises vitamin D supplementation during breastfeeding according to current recommendations.
- Hydration and support: having food and drinks available can matter just as much as knowing what a healthy meal looks like.
Nutrition can support recovery, but persistent low mood, severe exhaustion or other concerning symptoms should not be assumed to be a nutrient problem. Postnatal mental and physical health symptoms deserve proper assessment.
Conclusion
Optimising nutrition during preconception, pregnancy and postpartum is one useful part of supporting maternal and reproductive health. Food-first habits, recommended pregnancy supplements and individual clinical advice can work together without promising that diet alone can prevent infertility or pregnancy complications.
If you’re planning a pregnancy, currently expecting, or rebuilding postpartum, a suitably qualified professional can help tailor advice to your needs. Always check supplements and significant dietary changes with your GP, midwife, pharmacist or another appropriate healthcare professional.
About Chloe Dymond Young
Chloe Dymond Young has over 15 years’ experience across midwifery, lactation support and nutritional therapy. She trained at King’s College London and worked at St Thomas’ Hospital in clinical midwifery and maternity research before developing her private practice.
She qualified as an IBCLC in 2015 and has supported breastfeeding families in NHS and private settings, including at The Evelina Children’s Hospital. She now blends nutrition and personalised care through mynutriGen.
Evidence and UK guidance
NHS: Pregnancy vitamins and supplements
NHS: Foods to avoid in pregnancy
