The question was whether the experimental diet could prevent breast cancer.

"But we cannot say that such a diet will prevent or cure cancer," he added.

But a special diet low in phenylalanine can prevent those consequences.

Here was a hypothesis that just a better diet could prevent breast cancer.

There is also no concrete evidence that an alkaline or vegetarian diet can prevent cancer.

A healthy diet can also help lower cholesterol, high blood pressure, and prevent heart disease and stroke.

For nearly 30 years, many doctors and most of the public have believed that high-fiber diets prevent colon cancer.

A federal study released last week, the largest study of its kind, found that low-fat diets do not prevent heart disease.

A higher-fiber diet has been shown to lower blood cholesterol levels and prevent constipation.

Diets to prevent disease and improve mental health.