Spanx make “shaping”, “slimming” and “smoothing” underwear – horribly uncomfortable-looking 21st century nylon corset contraptions that make Bridget Jones’ infamous big pants look positively skimpy. Make of that what you will. What makes me angry about this is that according to their size chart, these “slimming” products are recommended to women with a body mass index from just 16.8. As you are probably aware, 18.5 is the lowest BMI considered even vaguely healthy. What’s also worth bearing in mind is that a BMI below 17.5 is a diagnostic criterion for anorexia.