You don’t have to follow strict rules or give up steak forever, and this diet can have life-changing benefits

Susan S. Johnson

Five years ago, after Dr. Jon O’Neal’s fourth friend died suddenly of a heart attack, O’Neal spent a long time thinking about his friends’ dietary habits, which prompted him to rethink his own.

“As much as I love food, I love being around and being healthy,” says O’Neal, who grew up in Kansas and lived in Texas. “I was a complete omnivore. I could drive blindfolded to the three best barbecue places in Austin. I’d go to the Kansas City barbecue. But then I started having my friends in Kansas City die of heart attacks and I looked at that

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