Quick answer
What nutrients matter most in pregnancy?
Folic acid, iron, calcium, protein, omega-3 fatty acids and vitamin D. Folic acid matters most and ideally starts before conception, because it prevents neural tube defects affecting the brain and spine. Eating for two does not mean doubling your intake — around three hundred extra calories a day in the second and third trimesters is typical.
Pregnancy changes a great deal, physically and emotionally. As a gynaecologist I cannot overstate how much nutrition matters during it — what you eat affects your own health and plays a direct part in your baby’s growth and development.
What follows is practical rather than exhaustive, and none of it is meant to make you feel guilty about a bad week.
Why it matters
Your body needs additional nutrients to support the baby’s development. They are the building blocks for bones, organs and overall growth. Good nutrition helps prevent birth defects, supports brain development and contributes to a healthy birth weight.
The nutrients that matter most
Folic acid
A B vitamin, and the most important one on this list. It prevents neural tube defects affecting the brain and spine. Ideally start before conception and continue through the first trimester. Found in leafy green vegetables, citrus fruit, beans and fortified cereals.
Iron
Needed to make haemoglobin, which carries oxygen to your tissues and to the baby. Blood volume rises in pregnancy, so requirements rise with it. Low iron causes anaemia, fatigue and complications at delivery. Lean meat, spinach and lentils are good sources.
Calcium
For the baby’s bones and teeth. If you do not take in enough, your body takes it from your own bones. Dairy, fortified plant milks and leafy greens.
Protein
Builds tissue and muscle, and demand rises particularly in the second and third trimesters. Vary the sources — lean meat, eggs, beans, nuts.
Omega-3 fatty acids
DHA in particular supports brain and eye development. Oily fish, flaxseed and walnuts.
Vitamin D
Helps you absorb calcium and supports bone development. Sunlight is the natural source; fortified foods and supplements fill the gap.
Practical rules
Eat a varied diet. Fruit, vegetables, whole grains, lean protein, dairy or alternatives.
Drink enough. Blood volume increases; aim for eight to ten glasses of water a day.
Mind the portions. Eating for two does not mean doubling your intake. On average you need around three hundred extra calories a day in the second and third trimesters.
Avoid the risky things. Raw or undercooked meat, unpasteurised dairy, and fish high in mercury such as swordfish and shark.
Take your prenatal vitamins. They fill gaps. They do not replace food.
It matters beyond the birth
Good prenatal nutrition has been linked to a lower risk of chronic conditions later in the child’s life, including obesity, diabetes and heart disease. You are laying a foundation, not just getting through nine months.
Questions about your own diet in pregnancy? Bring them to an appointment — it is one of the more enjoyable parts of my job.
