Eating for Two: The Truth About Pregnancy Eating
"You're eating for two now" is one of the most repeated pieces of pregnancy advice — and one of the most misleading. In reality, your calorie needs barely change for most of pregnancy, and the extra energy you do need towards the end is far smaller than most people assume. Understanding the real numbers can take the pressure off and help you focus on eating well rather than eating more.
Where the myth comes from
The idea of "eating for two" likely dates back to eras when maternal nutrition was poorer and food scarcity was common, so encouraging pregnant women to eat more made sense as general advice. It has stuck around in popular culture, but it doesn't reflect how a growing baby actually uses energy. A baby at term typically weighs a fraction of an adult's body weight, and the additional calories needed to support that growth are modest, not double.
What you actually need, trimester by trimester
- First trimester (weeks 1–12): No extra calories are needed. Your energy requirements are the same as before pregnancy — focus on a varied, balanced diet rather than "more" food.
- Second trimester: Around an extra 300 calories a day is typically recommended — roughly the equivalent of a slice of wholemeal toast with peanut butter, or a portion of yoghurt with fruit.
- Third trimester: Slightly more again, broadly in the range of an extra 200–500 calories a day depending on individual advice from your midwife, reflecting your baby's fastest growth phase.
- These are general guides, not fixed targets — appetite, activity levels, and pre-pregnancy weight all vary, so your midwife may tailor advice to you.
Quality over quantity
Rather than counting calories, it's more useful to think about what those calories are made of:
- Include a mix of starchy carbohydrates, protein, dairy or dairy alternatives, and at least five portions of fruit and vegetables a day.
- Oily fish (within the recommended limits), pulses, eggs, and lean meat help meet increased protein and iron needs.
- Limit sugary snacks, fried food, and highly processed products — they add calories without much nutritional value.
- Excess weight gain in pregnancy is linked to a higher chance of complications such as gestational diabetes and a more difficult birth, so "eating for two" in the literal sense can do more harm than good.
Managing appetite changes
Appetite in pregnancy can swing wildly — some weeks you may feel ravenous, others (especially in the first trimester with nausea) you may eat very little. Small, frequent meals often work better than three large ones, particularly if you're dealing with morning sickness or heartburn. If you're worried you're eating too little or too much, your midwife can check your weight gain is tracking appropriately at your antenatal appointments.
Frequently Asked Questions
Do I need to eat more in the first trimester?
No. In the first trimester your calorie needs are the same as before pregnancy, so there's no need for extra food. The priority is eating a balanced diet with enough folic acid, vitamin D, and iron rather than increasing portion sizes.
How many extra calories do I need in pregnancy?
Roughly none in the first trimester, about 300 extra a day in the second trimester, and a little more again in the third — figures that reflect one modest extra snack, not a second meal. Your exact needs depend on your activity level, pre-pregnancy weight, and whether you're carrying more than one baby, so ask your midwife if you're unsure.
Will I gain too much weight if I don't "eat for two"?
Following the "eating for two" myth is actually more likely to lead to excess weight gain than following genuine calorie guidance. Healthy weight gain varies by individual and is best tracked with your midwife rather than by comparing yourself to others or to old advice.
This article is for informational purposes only and does not constitute medical advice. Always speak to your midwife, GP, or a registered dietitian about your individual nutritional needs in pregnancy.
Related articles: