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A tomato a day could keep doctors away

Changes in diet could also help prevent cancer, particularly eating more tomato products, like tomato sauce or even the nutritionally maligned pizza, say researchers. Their study showed that adding tomato products to your diet can slash men's odds of getting prostate cancer. 

Tomatoes contain a substance called lycopene, which has been linked to a drop in prostate cancer rates.   "We found that the high consumption of tomato and tomato-based product had reduced the risk of prostate cancer by almost 40 percent," said Dr. Edward Giovannucci of the Harvard School of Public Health. 

Lycopene, like Vitamin A, is an antioxidant, a chemical thought to inhibit processes in the body that lead to cancer. "Lycopene is absorbed in the body as we are absorbing oils and fats," Giovannucci said. "To absorb lycopene, we do need to have some fat in the diet." 

Since the fat substitute Olestra reduces the amount of lycopene in the body, scientists say it might increase cancer risk. But Proctor and Gamble, which makes Olestra, says any loss of lycopene from its product is insignificant and wouldn't be harmful.