To prevent sickness, you want to have good levels of vitamin C and I believe zinc.
Vitamin C is mostly obtained from citrus fruit. You cut a lemon in half, and squeeze the juice into your mouth, and swallow after letting it sit in your throat. You can also just eat/drink a lot of orange, but lemon is the best treatment. Using vitamin C pills aren't as good as getting it naturally.
I don't know about where to get zinc, sorry.
To prevent heart disease, eat a balanced diet, exercise daily, and live a stress-free life. It is also good to stay in touch with your family doctor to make sure you're on the right track.
Coffee won't prevent Alzheimer's disease.
With a history of heart disease in your family you should talk to a doctor to find out the signs that you should be looking out for. you should also ask how to prevent it.
Vaccines, such Fluvax, can prevent viral disease.
Tetanus does not prevent a disease; it is a disease.
No, it helps to prevent disease.
Prophy means "to prevent disease". For example a dental prophy is a teeth cleaning done to prevent disease.
yes
goiters
To prevent disease
No. They definitely help prevent, and can prevent disease, but there is still a possibility you can still get the disease (or pregnant). They do lower the risk a lot though.
Cells can cause disease, but can also prevent disease.