From my own experience, treating watercress gently during cooking makes a noticeable difference in its health effects and taste. The critical enzyme myrosinase, which activates sulfur compounds like PEITC, is very sensitive to heat. When I used to boil watercress for soups as a habit, I felt it lost that fresh, vibrant flavor and its health impact seemed less potent. I found that chopping or chewing the watercress and then letting it rest for about 5 to 10 minutes before eating helps the enzyme work better. Eating it raw or adding it at the final stage of cooking, such as a quick stir-fry or sprinkling it on top of hot dishes, preserves this enzyme and the beneficial signals it sends to our body. This subtle but important technique aligns with the idea of food acting as biological signals rather than just nutrients. Gentle preparation keeps these signals "alive," enhancing the antioxidant and anti-inflammatory properties of watercress. For anyone interested in functional medicine or evidence-based nutrition, this approach transforms simple greens into powerful allies for wellness. Also, from practical cooking, steaming watercress very briefly or simply tossing it into a salad lets you enjoy its flavor and benefits without sacrificing its protective enzyme activity. Avoid high heat and prolonged cooking, which quickly degrade the enzyme myrosinase. Overall, understanding the biological signaling role of watercress and adapting cooking methods the right way is a game-changer for anyone wanting to maximize the health impact of their meals.