Selecting the right items during grocery trips can be difficult when many foods appear equally healthy. While many consumers rely on labels to avoid high sodium or sugar, choosing between two nutritious options requires looking closer at nutrient density—the amount of nutrients provided per calorie.

Which greens are the most nutrient-dense?

While kale and spinach often dominate health trends, they are not necessarily the most concentrated sources of nutrition. According to a 2014 study from the CDC, watercress is a top performer, providing 17 nutrients per calorie. In fact, watercress scored a perfect 100 in a study of 47 fruits and vegetables, outperforming many popular greens:

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  • Chinese cabbage (91.99 points)
  • Swiss chard (89.27 points)
  • Beet greens (87.08 points)
  • Spinach (86.43 points)
  • Kale (49.07 points)

To maximize absorption of fat-soluble vitamins like A, E, and K, experts suggest pairing these greens with healthy fats such as olive oil or avocado.

Comparing dried fruits and starchy vegetables

When choosing between dried fruits, the choice often depends on specific health goals. Prunes offer more fiber and nearly twice the Vitamin A of raisins, making them better for digestion. However, raisins provide more iron and protein, though they contain significantly more sugar.

Similarly, starchy vegetables like sweet potatoes and pumpkins serve different purposes. A dietitian noted that sweet potatoes are more calorie-dense and better for athletes needing energy, while pumpkin is a lower-calorie vegetable that provides high fiber content for weight management.

Evaluating protein and dairy

Newer research, such as the BPI Score, evaluates protein based on nutritional value, cost, and environmental impact. In this ranking, plant-based options like tofu, chia seeds, and beans occupy the top spots. Tofu, for example, ranked first among 20 sources, beating chicken and tuna when sustainability and nutrition are weighed together.

Even common dairy products show significant differences. While cottage cheese and Greek yogurt offer similar protein and calorie counts, cottage cheese is much higher in sodium. For those managing salt intake, plain Greek yogurt is often the better choice. Ultimately, experts suggest that while finding a "superfood" is helpful, a diverse diet remains the most effective strategy for long-term health.