A study published in PLOS Medicine in 2015 examined the long-term impact certain fruits and veggies had on weight gain. From 1986 to 2010, researchers from Harvard University examined the eating habits of more than 133,000 United States adults aged 25 to 75 (at the time of enrollment); every four years they administered questionnaires that asked participants to record what they ate every day for a week, and every two years they weighed the participants. Finally, the researchers compared that data to information from the USDA on the nutritional value of the food to find links between specific produce and weight.
Though loaded with nutrients like potassium, iron, and fiber, starchy vegetables also have a "higher glycemic load"—meaning they produce bigger and more frequent blood-sugar spikes.
People who ate more corn, potatoes, and peas—AKA starchy vegetables—were more likely to gain weight: Though loaded with nutrients like potassium, iron, and fiber, these items also have a "higher glycemic load"—meaning they produce bigger and more frequent blood-sugar spikes—which researchers said might be why they cause weight gain. Of these starchy vegetables, corn was shown to have the worst effects: Researchers found it led to two pounds gained per additional serving in a day (for potatoes, it was three quarters of a pound; for peas, just more than one pound).
Of course, this study doesn't spell the end of summer corn on the cob or your favorite elote dish, but it's something to keep in mind if you're torn between your choice of sides as barbecue season gets underway. As with the best stuff in life, moderation is key.
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