Alcohol and other drugs affect the nerve cells within the brain.

obesity is a result of eating unhealthy junk food which increases the fat content of the body and makes you obess. it is also further because of not doing proper exercise and not participating in any physical activity.

this is true. vitamins and minerals wounds heal and boost your immune system so you don’t get as sick.

age might have something to do with behavior depending on the age because not everyone who is the same age acts the same like 2 year olds could have bad behavior but some won't.

i hope this : )