We know that chips, candy, and chocolate cake don't do waistlines any good—but can junk food also stunt our intelligence? The IQs of children who eat fatty, sugary, processed foods appear to suffer years later, while the IQs of those who eat healthily increase, according to a study published Monday in the Journal of Epidemiology and Community Health. British researchers tracked what 14,000 children ate and drank at ages 3, 4, 7, and 8½, and found that those who ate a diet high in processed foods at age 3 had a slightly lower IQ five years later than their healthier-eating peers. Kids whose diet emphasized fruit, vegetables, salads, fish, rice, and pasta, meanwhile, saw small increases in their IQ. Diet likely makes the greatest impact during the first three years of life, when the brain is rapidly developing; good nutrition promotes brain growth and cognitive skills. "We know (a healthy diet) is important for physical growth and development, but it may also be important for mental ability."
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