I would say building resilience is the answer that makes the most sense as seeing its the only thing that effects your health positively.
ENVIRONMENT
There are many theories discussing how genetics and upbringing shape a person’s personality throughout his life. Ryan’s interaction with his environment and the experiences he had throughout his life shapes his personality. Openness, conscientiousness, extraversion, agreeableness and neuroticism are the five traits that influence how he participates with his surroundings.
Theorists believed that early life experiences have the maximum impact in a person’s personality. However, they also argued that new life experiences, temperament, the kind of social roles or simply growing older can change an individual’s personality over time.
If you are a smoker quit smoking. Eat three meals a day, doesn't mean you have to eat a lot. Eat alot of vegetables and fruits - at least 1/4 cup worth a day. Avoid processed/canned fruits as they most likely added sugar to it. Exercise daily at least half an hour a day. Stay hygienic. Eat more proteins than junk food. Lessen the amount of snacks a day to 1-2 each should be 100 cals or below. Avoid eating a lot of carbs as it can raise insulin and make you feel hungry often.