As long as you go easy on the French fries, you pretty much can't go wrong making fruits and vegetables a focus of your diet.

But which produce is the most worth your while?

Jennifer Di Noia, a researcher at William Paterson University who specializes in public health,ranked a long list of fruits and veggies based on their nutrient density to see which ones should be classified as "powerhouse" foods: those most strongly associated with a reduced risk of chronic disease.

She generated scores using 17 nutrients that are key to our health: potassium, fiber, protein, calcium, iron, thiamine, riboflavin, niacin, folate, zinc, and vitamins A, B6, B12, C, D, E, and K.

Each powerhouse food had to provide at least 10% of the daily value of a particular nutrient to be considered a good source, and the more the better — up to 100%. Those fruits and vegetables with fewer calories and more "bioavailable" nutrients (i.e., how much the body can actually make use of a nutrient once it's been ingested) ranked higher.

While we all have different dietary needs, the items at the top of this list would be pretty solid additions to almost anyone's dinner plate. One big takeaway? Eat your greens — they're pretty much all nutrients and water.

Here are Di Noia's 41 powerhouse foods, with the most nutritious ranked as No. 1.

41. Grapefruit (white)