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How much weight should you gain? The honest answer is: it depends on where you started.

Malaysia's Maternal Dietary Guidelines, published in 2023, follow international benchmarks based on your pre-pregnancy BMI. Underweight women are advised to gain more. Women who start pregnancy overweight or obese are advised to gain less. These aren't arbitrary numbers. The U.S. Institute of Medicine's widely-used 2009 guidelines set the ranges like this: about 12.5-18 kg for underweight women, 11.5-16 kg for normal-weight women, 7-11.5 kg for overweight women, and 5-9 kg for obese women.

Why does this matter? Because both ends of the scale carry risk. Gaining too little weight, or losing weight during pregnancy, is linked to a higher risk of small-for-gestational-age babies and preterm birth. Gaining too much brings its own set of complications. The goal isn't to gain as little as possible. It's to gain the appropriate amount for your body.

There's a local wrinkle worth knowing too. A study of Malaysian mothers found that women who were overweight before pregnancy, and women shorter than 153 cm, were more likely to have inadequate weight gain during pregnancy. If either applies to you, it's worth tracking your weight gain more closely with your care provider, rather than assuming things will average out on their own.

Several nutrients deserve particular attention during pregnancy because requirements increase or inadequate intake can have important consequences.

Folate supports your baby's neural tube development in the very early weeks, often before you know you're pregnant. This is why folic acid supplementation is recommended even before conception.

Iron requirements increase during pregnancy to support expansion of maternal red blood cell mass as well as the developing placenta and fetus. Also, the Malaysian guideline recommends iron and folic acid supplementation during pregnancy according to healthcare guidance; diet alone is not always enough to meet increased iron requirements.

Vitamin D and iodine also deserve attention. Multiple local studies have found vitamin D deficiency in over 40% of pregnant women tested, despite Malaysia's abundant sunshine. Separate studies in Sarawak and Sabah have found iodine intake below recommended levels in roughly 60% of pregnant women tested, even in areas with mandatory salt iodization.

The good news: many familiar local foods cover these needs well. Ikan bilis eaten with the bones can contribute calcium, while ikan kembung provides protein, omega-3 fats and vitamin D. Tofu and tempeh contribute plant protein and minerals, while leafy vegetables, legumes and other plant foods can contribute folate and iron. Fish, seafood, eggs and dairy foods can also help provide iodine.

Let's address a few myths directly.

Myth: You need to double your calorie intake. You don't. Most women only need a modest increase in calories, and mainly in the second and third trimesters, not from day one. "Eating for two" was never meant to be taken literally.

Myth: You should eat as little as possible to control weight gain. This is just as risky as overeating. Deliberately restricting food to keep pregnancy weight gain as low as possible can make it harder to meet energy, protein and micronutrient needs. The goal is not minimal weight gain; it is appropriate weight gain while supporting both maternal nutrition and fetal growth.

Myth: Certain traditional restrictions (avoiding whole food groups "just in case") are always necessary. Some food safety precautions in pregnancy are genuinely evidence-based, like avoiding raw or undercooked foods due to infection risk. But many inherited food restrictions aren't backed by evidence and can needlessly limit nutrient variety. When in doubt, ask your doctor or a dietitian rather than defaulting to caution based on tradition alone.