Research has shown that even a small amount of negative brain activity can lead to a weakened immune system, making you more prone to illness, and even lead to a heart attack or a stroke. Negative attitudes can also affect your intelligence and ability to think — according to Dr. When you are around someone who is constantly negative, it can be hard to feel happy or positive. It can be frustrating to be around someone who is always moaning and groaning, or who is always pointing out the negative in everything. It can be hard to feel good about yourself when you are around someone who is always down on everything. However, it is important to remember that not all people are like this. There are also plenty of positive people out there, and it is always worth trying to get to know them. It is also important to remember that everyone has their own unique strengths and weaknesses, and it is not necessary to like everything about everyone. In the end, it is best to try to focus on your own happiness and contentment, and not let the negative attitudes of others get to you.