The phrase "powerhouse fruits" refers to fruits that are packed with important nutrients and have many health benefits. These fruits are considered to be full of power and energy for our bodies. Full definition
In fact, it's ranked 5 on the list of nutrition powerhouse fruits and vegetables published on Centers for Disease Control and Prevention. (fitwirr.com)
Based on 17 nutrients, including potassium, fiber, protein, calcium, iron, thiamin, riboflavin, niacin, folate, zinc, and vitamins A, B6, B12, C, D, E, and K, watercress scored a perfect 100 in a recent study titled, «Defining Powerhouse Fruits and Vegetables: A Nutrient Density Approach. (articles.mercola.com)
The pomegranate (Punica granatum) is an antioxidant powerhouse fruit, especially as a juice. (healing4soul.com)