Can broccoli’s tiny natural carriers survive cooking?

Scientists are learning that plants don’t just provide us with vitamins, fiber, and antioxidants—they also release tiny biological “packages” called extracellular vesicles (EVs), or exosomes, that may influence human health. These nanosized carriers can transport proteins, RNA, and other molecules into our bodies when we eat plant-based foods, potentially helping to prevent or treat disease.

A research team led by researchers from IMDEA Food Institute in Madrid explored whether broccoli-derived EVs can survive cooking and digestion long enough to benefit our health. They compared raw broccoli, broccoli sprouts, and broccoli cooked using five common methods, frying, boiling, microwaving, scalding, and steaming.

The researchers found that all cooking methods reduced the number, structure, and cargo of broccoli EVs. Even so, about 10% of these EVs survived simulated digestion, and their RNA cargo could still enter intestinal cells. However, only a small fraction crossed the intestinal barrier, limiting their reach in the body. Interestingly, even after cooking, broccoli EVs retained some ability to slow the growth of intestinal and liver cells in lab tests, hinting that they may still deliver therapeutic benefits.

This work shows that while cooking affects broccoli’s EVs, it doesn’t completely erase their biological potential. These findings highlight an exciting area of research into how everyday foods may deliver natural “molecular messages” that influence human health.