Stress may contribute to or exacerbate various health problems. But things are changing.
The catch was, when they wrote about them every day, the benefits were minimal. How much of what you write do your readers instantly understand? If you do want to share some of your thoughts with trusted friends and loved ones, you could show them parts of your journal.
Use your journal as you see fit. These include empathy, critical thinking, creativity, strategy, imagination and vision.
The point is for you to clear your mind, so that you can go about your day, working, solving problems, and just enjoying life. Writing helps you see your own growth Journaling in particular helps you see how you have grown.