Optimism can:
Imporve immune system
Prevent chronic disease
Helps recover from illness and disease faster then a pessimistic view
Been used to treat people with cancer
Helped become better at relationships
Better sleep quality

Helps cope with difficult life events
Gives us better response to difficulties in life
Optimists are more likely to solve the problems they are faced with
HIV positive patients were more likely to plan recoveries
OPTIMISM helps avoid depression

Can cause depression and mental disorders
Can lead to poor life choices
Can lead people to neglect their health
This is because pessimistic people don't care much about their condition
Heart problems obesity
High cholesterol
Drinking
Smoking
Can cause chronic pain
Eating disorders
Anger and poor sleep habits/lack of sleep