Depression is also a cause of obesity. Some family has a gene that when they are depressed they eat. Depression is usually caused by things that happened in life. Depression is a medical illness that can be treated. Depression is a feeling that related to sadness but it's worst than that. Athletes usually feel this kind of feeling. They may be depressed by the pressure of the fans or maybe sometimes when you are too proud but suddenly you failed than it would really hurt your pride. This may lead to depression and depression may lead you to do inappropriate things. When you are depressed, you can't even think properly because you are only thinking about the things that hurt you. Exercise might help you to feel better because it will booze you up.
Stress is a feeling of being mentally or emotionally under pressure. There is a lot of ways for people to be stressed. They could be stress because of school work or office work but mostly people would be stress due to love affairs and such. What do I mean by love affairs, is just that, when they broke up they become sad then they stressed out thinking " How can I live without her/him". Stress can be harmful because stress may lead to death. What I mean is, it could lead to death because the person starts to think negatively and they can't take it so, they will just commit suicide. The most effective way to cure someone from being stress is to talk to them. It's the only key to try and calm someone down. It's the same to depression, stress may also lead to obesity.
Anxiety is normal human feeling that everbody experienced. It is a type of feeling like nervousness or anxious. It's normal because we are nervous to even talk to someone. It is normal but there is anxiety orders. Anxiety disorder is a serious mental illness. There are types of anxiety disorders. There are panic disorder, social anxiety disorder, specific phobias and generalised anxiety disorder. People with panic disorder condition usually have feelings of terror that strikes without any warning. There are other symptoms of panic attack like chest pain, sweating or strong heartbeats. It will make them feel like they have a heart attack or it's like they are going crazy. Social anxiety disorder may be called as social phobia. People with this disorder usually worries themselves. They have fear of being judged by others. Specific phobias are usually people who are scared of specific object for example, snakes, heights or flying. Generalised anxiety disorder are people who usually has an excessive or unrealistic worry.