It may sound like a familiar attack on the typical American diet

The study's recommended amounts, based on U.S. government guidelines, nutrition experts' advice, and amounts found to be beneficial or harmful in previous research.

"Good" ingredients

—Fruits: 3 average-sized fruits daily

—Vegetables: 2 cups cooked or 4 cups raw vegetables daily

—Nuts/seeds: 5 1-ounce servings per week — about 20 nuts per serving

—Whole grains: 2 ½ daily servings

—Polyunsaturated fats, found in many vegetable oils: 11 percent of daily calories

—Seafood: about 8 ounces weekly

"Bad" ingredients

—Red meat: 1 serving weekly — 1 medium steak or the equivalent

—Processed meat: None recommended

—Sugary drinks: None recommended

—Salt: 2,000 milligrams daily — just under a teaspoon.