Don't smoke.
Medical bills can be very expensive, so take care of your health and prevent problems from developing in the first place.
Buy generic drugs instead of branded ones.
Don't consume alcoholic drinks (e.g. wine, beer, liquor) because they contain ethanol, a substance which is known to cause cancer.
Don't buy non-stick cookware.
Don't buy or use cutting boards made of plastic. Instead, use cutting boards made of wood.
Don't buy homeopathic products.
Don't waste time and money watching spectator sports: your health won't improve by sitting in front of a TV screen eating junk food. A much better idea is to practice some sport yourself (as long as you don't have health conditions that prevent you from doing physical activity).
Always read package inserts before taking new prescription drugs.
Don't follow a fruitarian diet. Fruits alone don't have all the nutrients needed by the human body. Instead, follow a well-balanced vegan diet that includes fruits, vegetables, legumes, cereals, mushrooms, nuts and seeds.
Don't use a microwave oven to heat any food or drink in a plastic container. Use a glass or ceramic container instead.
Antibiotics are only effective against bacteria, so don't take them if you have an infectious disease that has been caused by a different kind of microbe, such as a virus (e.g. influenza, COVID-19).
Always wear a face mask if you believe you have an infectious disease (e.g. influenza, COVID-19) and you absolutely need to go in a place where there could be other people in close proximity (e.g. on the bus, at the grocery store).