What relationship did researchers find between journaling and a person's immune system?

What will be an ideal response?

Answer: In one study, students wrote either about a traumatic event or about an innocuous topic. Those who journaled about their trauma were less likely to get sick. And it was not just all in their heads—they produced more white blood cells, meaning their disease-fighting immune system was functioning better and they were less likely to get sick with a cold or the flu. Even people who threw away what they wrote experienced health benefits. And it does not have to take much time; even writing for 2 minutes can result in better health, though the benefits appear to be stronger if the writing is done over a period of weeks or months.