The first thing I check with my clients is how much water they are drinking.  Water is vital to ensure we function properly.  I spent much of my childhood and early twenties suffering from headaches, but it wasn’t until I reached my thirties that I realised it was often due to dehydration.  There are issues with people who drink too much water (nutrients in food can be diluted before they are absorbed), but they are few, and most of the people I meet don’t drink enough, are surprised by how...