Physical health

75% of the human brain is water. Hydration increases circulation and cleanses the organs of the body, especially the heart and brain. Drinking tea or juice isn't enough; it’s vital to drink water on its own as well. Some symptoms of not drinking enough water may include headaches and mood changes. (Source) 

Exercise can get you outside, exposing you to sunlight, fresh air, and potentially new companions through group activities. The act of physical movement reduces risk of physical illnesses, lifts your mood, and can improve your sleep. Exercise even helps you think more clearly with the extra blood flow to the brain, and increases the size of the hippocampus – the part of the brain responsible for memory. (Source)

Playing recreational sport 1-3 times a week reduced distress by 34%, according to a large study. Organised recreational activity is shown to raise self-esteem and brain function. This may be partly due to the social interaction aspect of the activities. The study also states these benefits are as potent as medication, for moderate anxiety and depression. (Source)

Across the general population, rates of smoking have declined greatly in the last 20 years. However, smoking is still common among people experiencing a mental illness, who often begin smoking earlier and smoke more than the average smoker. Even if you have a severe mental illness, you can cut down and quit smoking with the right support. Nicotine replacement therapy, for example, can help. (Source 1) (Source 2) (Source 3)