The study showed that even one serving a day can increase your risk of death by 12 percent.
"My take away from this is: everything in moderation. You can eat red meat. I wouldn't eat more than two servings per week," said Dr. Richard Besser, ABC News' medical editor. "In this study, a serving was 3 ounces, so that is the size of a deck of cards."
The study's authors found that eating fish, poultry, nuts and legumes was associated with a lower risk of mortality.
