Everything in moderation.
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For decades, Americans have organized their diet in a way to minimize their intake of saturated fats like butter and red meat. Vegetable oils and carbohydrates became a bigger part of our diet, because, we were repeatedly told, animal fats led to heart disease.

Today, however, we are learning that this advice was bogus. A recent landmark health study has concluded that there has never been a link between saturated fats and heart disease. The “settled science” on nutrition wasn’t quite so settled.
Writing in Saturday’s Wall Street Journal, nutrition researcher Nina Teicholz unpacks a new comprehensive study published in the Annals of Internal Medicine which found that “saturated fat does not cause heart disease.” This theory, and decades of government-sponsored nutritional advice can be traced back to one scientist at the University of Minnesota, Dr. Ancel Keyes. His crusade against animal fats began in the 1950s and has misled the public about a proper diet ever since.