Eating out should be fun, but for anyone on a diet, it can be a nightmare. You’re used to strictly managing what goes into your meals, whether it’s salt and sugar or cheese and fat. Trusting anyone else to prepare a meal that reflects your needs is tough enough when you’re dining at a friend’s place, but it’s even harder when you’re heading to a restaurant. Whether it’s a Michelin-star-rated eatery or a fast-food franchise, the focus is usually on taste and presentation, rather ...