It’s January, which means that all across America, people are resolving to eat better. And that means that they’re also resolving to smugly tell you about it. But the next time your newly gluten-free, sugar-free, and dairy-free co-worker insists that you need to jump on the kale-acai smoothie express, just be thankful that this isn’t the turn of the century. Because back in the late 1800s and early 1900s, diet adherents really knew how to twist the guilt knife.

Take, for example, this introductory passage from 1912’s Unfired Food and Tropho-Therapy:

If you have concluded that “Ignorance is bliss” and prefer to cater to your perverted appetite with your favorite predigested food, which is so tempting, so sweet in the mouth, so easy to gulp, so smooth to swallow, so stimulating, and so fashionable, then lay this book aside until you have learnt through disease and pain that… More…