10 Fascinating Facts About Vegetables
Vegetables are superstars. Nearly every diet—from Mediterranean to Paleo to Weight Watchers to DASH—wants a piece of them. Think you know your veggies? Some of these 10 things may surprise you.
Article by Bonnie Liebman and Lindsay Moyer. The information for this article was compiled by Jennifer Urban and Jolene Mafnas.
1. You probably don’t eat enough.
Nine out of 10 Americans fall short. A good target: at least 2½ to 3 cups a day.
Better yet, forget the cups. Cover half your plate—and not just at dinner—with vegetables (and/or fruit).
And don’t forget snacks. What better way to tide you over to your next meal without ruining your appetite or gobbling up your calorie budget?
2. Veggies help you slash calories.
You don’t find many foods with just 10 to 50 calories per serving. Talk about an almost-free lunch. Vegetables are mostly water, so unless you smother them with dressing, sauce, butter, or sauté oils, they’re a steal.
And now you can replace boring white rice with “rice” made of cauliflower, or trade your pasta for zucchini spirals.The calories drop from 200 to 20 per cup. Or swap your white flour wrap for one made of lettuce.
And there’s no better swap for chips or pretzels or crackers. Walking in the door famished? Grab a handful of carrots or grape tomatoes or sugar snap peas to munch on as you cook dinner.
3. The evidence is strongest that veggies protect your heart and brain.
You may think of vegetables as cancer fighters, but there’s more evidence that they protect your blood vessels.
In a recent meta-analysis of up to 20 studies on up to a million people, those who ate 18 ounces of vegetables (about 3 cups) a day had roughly a 30 percent lower risk of heart disease and stroke than those who ate little or none.1
Something else about vegetable eaters could partly explain the results from those and other studies that track what people eat and their health for years.
But in the DASH (Dietary Approaches to Stop Hypertension) study, systolic blood pressure (the higher number) dropped by 8 to 14 points when people were fed a diet rich in vegetables and fruit. (The diet was also low in added sugars, saturated fat, refined grains, and salt.) That’s about the same drop you’d get from some drugs that lower blood pressure.
4. Veggies may lower the risk of breast cancer.
Cancers vary. Vegetables may help prevent some but not others.
For example, in a pooled analysis of 20 studies on nearly a million women, vegetables were not linked to the most common breast tumors, which are fueled by estrogen (estrogen-positive). However, women who ate the most vegetables (at least 14 oz. a day) had a 15 percent lower risk of estrogen-negative breast cancer than those who ate about 5oz.2 And estrogen-negative tumors have lower survival rates, so preventing them is crucial.
5. Veggies may protect your eyes.
Many vegetables, especially leafy greens, are rich in lutein and its twin, zeaxanthin. Although the evidence isn’t sewn up, both clearly matter for eyes.
They are the only carotenoids in the lens and the retina, where they absorb damaging light and protect against oxidation. And levels are 100-fold higher in the macula (the center of the retina)—which lets us see the finest detail and is exposed to the most light—than elsewhere in the eye.
In a study that tracked some 100,000 men and women for roughly 25 years, those who consumed the most lutein plus zeaxanthin had a 40 percent lower risk of advanced macular degeneration than those who consumed the least.3
A similar study found an 18 percent lower risk of cataracts in women who reported eating the most lutein.4 Go greens!
6. Veggies pile on the potassium.
Potassium helps lower blood pressure, and it may also make blood vessels less stiff.
That could explain why people who eat more have a lower risk of stroke.5
But getting enough potassium— 4,700 milligrams a day—is a tall order. That is, unless you cover half your plate with vegetables (or fruit), which pour on the potassium without a load of calories.
(We left white potatoes out of our Top 5 potassium list because Americans already eat too many fries and potato chips.)
7. Leafy greens may lower your risk of diabetes.
In some studies, people who eat more leafy greens have a lower risk of type 2 diabetes. Magnesium may explain why.6
Half the population gets less magnesium than experts recommend. Although more studies are needed, magnesium may help keep a lid on blood sugar.
Magnesium is at the heart of the chlorophyll molecule that makes leaves green, so bring on the spinach, etc.
8. Veggies may preserve your bones.
When researchers pooled data on roughly 142,000 European and U.S. residents aged 60 or older, those who ate no more than one serving of vegetables a day had a 12 percent higher risk of hip fracture than those who ate about two to three servings.7
It’s too early to tell how—or if—veggies help keep bones strong. Stay tuned.
9. All veggies are good veggies.
Some, though, are richer in nutrients than others. We’ve ranked them from most to least nutrient packed.
Want even higher scores? Double—or triple—the serving size. (Who stops at a half cup of bok choy or broccoli, anyway?)
And who cares if a vegetable like mushrooms brings up the rear? They boost your potassium for hardly any calories. As for shiitakes and portobellos: Who could live without ‘em?
One more thing: our scores give no credit for phytochemicals that may eventually turn out to matter.
10. Veggies are delicious.
Mushroom ragù. Braised greens. Roasted parsnips, radishes, and carrots. Grilled cauliflower steaks.
Want more? We got a million.
1 Int. J. Epidemiol. 46: 1029, 2017.
2 J. Natl. Cancer Inst. 105: 219, 2013.
3 JAMA Ophthalmol. 133: 1415, 2015.
4 Arch. Ophthalmol. 126: 102, 2008.
5 Stroke 45: 2874, 2014.
6 Eur. J. Clin. Nutr. 66: 1082, 2012.
7 J. Bone Miner. Res. 31: 1743, 2016.
How We Got Our Scores
We calculated a score for each vegetable by adding up its percentage of the recommended daily intake for eight nutrients, lutein (plus zeaxanthin), and carotenoids other than lutein. We used the Daily Value (DV) for all but three. For calcium, we used the Recommended Dietary Allowance (RDA) for women over 50 and men over 70. And for lutein (plus zeaxanthin) and other carotenoids, we devised our own recommended intakes from available research.
For example, half a cup of cooked spinach has 320 percent of our target for lutein and 178 percent of our target for other carotenoids, 10 percent of the RDA for calcium, and 350 percent of the DV for vitamin K, 31 percent for folate, 18 percent for magnesium, 17 percent for iron, 9 percent for vitamin C, 8 percent for potassium, and 7 percent for fiber. That gives it a score of 948 points.
We counted calcium, iron, folate, and magnesium in our scores but they’re not in the chart. Ditto for carotenoids other than lutein, which include alpha-carotene, beta-carotene, beta-cryptoxanthin, and lycopene.
Vegetables are ranked by highest to lowest score, then least to most calories.