An analysis of nearly 200 studies involving millions of people finds inconclusive results as to whether meat and dairy foods are good or bad for the heart.

According to an article in USA Today, researchers identified a short list of foods for which strong evidence indicates either a positive or negative influence on heart health but a much larger “gray area” for most foods. The research report, which appears in this week’s Archives of Internal Medicine, concludes that vegetables, nuts and the Mediterranean diet rich in fish, whole grains and olive oil are good for the heart, while starchy carbohydrates and trans fats are bad. For meat and dairy products, the analysis did not reveal enough evidence to conclude they are either good or bad for the heart.

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