OK, it's not technically a food — but getting enough is just as important to your health as any nutrient. Water has lots of benefits for you and your growing baby: building new cells, delivering nutrients, flushing toxins and more. Water also makes your tummy feel full, so you're less tempted to reach for chips or cookies, and it can help with constipation during pregnancy. Plus, the dangers of dehydration are real: It can up the risk of early labor. So fill up one of those stainless-steel water bottles and take it wherever you go.
Tip: Water from all sources counts (100 percent juice, milk, soup, tea), so don't stress too much if two quarts a day of plain water is, well, too much to swallow. Focus instead on total fluid intake.
Of course this is just a short list. There are plenty of other nutritious powerhouse foods to choose from — grains of all kinds, seeds, yams and winter squash, apricots, kiwi (one small kiwi contains as much vitamin C as an orange, plus it's unparalleled for its laxative effects), papaya and much more.
One last word to the wise: How much you eat is as important as what you eat. If you're starting your pregnancy at a healthy weight, you don't need any extra calories in the first trimester, only 300 extra calories a day in the second trimester (about a cup of low-fat Greek yogurt and a whole-wheat English muffin), and about 500 more in the third trimester. If you're underweight to begin with, or are carrying multiples, your doctor may suggest you eat a bit more; if you're overweight, a bit less. Following her recommendations will help keep your pregnancy weight gain on track — which in turn lowers your risk for having a baby who's too small or too large and reduces your risk for complications like gestational diabetes and high blood pressure.
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