"She [Aunt Polly] was a subscriber to all the 'Health' periodicals and phrenological frauds; and the solemn ignorance they were inflated with was breath to her nostrils. All the rot they contained about ventilation, and how to go to bed, and how to get up, and what to eat, and what to drink, and how much exercise to take, and what frame of mind to keep oneself in, and what sort of clothing to wear, was all gospel to her, and she never observed that health journals of the current month customarily upset everything they had recommended the month before. She was as simple-hearted and honest as the day was long, and so she was an easy victim. She gathered together her quack periodicals and her quack medicines, and, thus armed with death, went about on her pale horse, metaphorically speaking, with 'hell following after.'"

The Adventures of Tom Sawyer
Ch. 12