Think of a superfood. What comes to mind? Avocado? Turmeric? Quinoa? Many of us will have a grasp of the most mainstream so-called superfoods. The ones that have become dietary superheroes thanks to savvy marketing. Larger-than-life in the public imagination, they walk among us with a sheen: blueberries with their polyphenols; kale and its vitamin K; goji berries and all their antioxidants. But what is and isn’t a superfood is actually down to trends – take the current resurgence of a previously shunned, tragically uncool food: cottage cheese. Beloved by Richard Nixon with pineapple (the Watergate tapes weren’t just illuminating...