Diet myths busted: Why breakfast isn't the most important meal (and other uncomfortable truths) Callan Boys Photo: iStock Spinach makes us strong and eating fish makes us smart. Saturated fat is bad, we should never snack before bedtime. Breakfast, meanwhile, is essential every single day. These are absolute truths that should never be questioned, right? Wrong. They should be seriously questioned, according to Tim Spector, author of "The purpose of The Diet Myth was to explain how gut microbes interact with food, but after its publication six years ago, I really started to notice how bad eating habits had become in Australia, England and the US," he says.