Why isn my brain release serotonin anymore?
You are becoming desensitized to certain things. When you do things over and over again, eventually they lose there luster. Ask anyone who beats the same video game 10 times, even though they enjoyed it when it first came out, after so many times of playing it, it becomes dull and boring. That doesn’t have anything to do with serotonin, it has to do with an experience being old and dull. That is why everyone needs to experience new things on a regular basis, because the same old routine day after day eventually becomes depressing, and I believe this is the major contributing factor to people who suffer from midlife crisis, they know their lives are becoming shorter, and they need to experience something new and exciting.