None of those things are necessary most of the time, and they’re usually just going to make you paranoid. It’s why doctors don’t generally like to do full-body scans on healthy people: they’re rarely going to find anything clinically significant, but they’re often going to find something that causes a scare and some unnecessary tests. (And if the scan is a CT scan, on average, the radiation may cause more cancers than it catches if you’re scanning healthy people for no reason.)

If you want to have the best shot at preventing disease and living a long, healthy life, it’s not complicated: eat a healthy diet, exercise, get a good night’s sleep, avoid drugs and alcohol, and have fulfilling relationships with other people. Beyond that, you’re spending a lot of money on things that are going to have a negligible or even negative impact on your health and quality of life.