How smart is Popeye? Smarter than you think. Popeye attributes his amazing strength to eating spinach, but he is also protecting himself against osteoporosis, heart disease, colon cancer and arthritis. The Journal of Nutrition recently published a report that spinach fights prostate cancer while The Nurses Health Study reveals women whose diets are high in kaempferol, a nutrient in spinach, reduce their risk of ovarian cancer by 40 percent. Spinach, like other leafy green vegetables, provides more nutrients ...