For a long time now I've been taking vitamin supplements. I've always considered them as a sort of insurance. If the stuff I was eating didn't quite give me everything I needed, the pills would fill it out. Or so I thought.
Ever since my late twenties I've been a pretty conscientious eater, and have eaten healthier than most people. But after 17 years as a thoughtful vegetarian, taking vitamins regularly, I ended up with a shortage. A blood test confirmed that I was short of vitamin B12. I hadn't been doing as good a job as I'd thought.