Then we should be careful to provide this wholesome food in proper amount. Mental gluttony, or over-reading, is a dangerous propensity, tending to weakness of digestive power, and in some cases to loss of appetite: we know that bread is a good and wholesome food, but who would like to try the experiment of eating two or three loaves at a sitting?
I have heard a physician telling his patient—whose complaint was merely gluttony and want of exercise—that ‘the earliest symptom of hyper-nutrition is a deposition of adipose tissue,’ and no doubt the fine long words greatly consoled the poor man under his increasing load of fat.
I wonder if there is such a thing in nature as a FAT MIND? I really think I have met with one or two: minds which could not keep up with the slowest trot in conversation; could not jump over a logical fence, to save their lives; always got stuck fast in a narrow argument; and, in short, were fit for nothing but to waddle helplessly through the world.
Charles Dodgson (Lewis Carroll), "Feeding the Mind". (This is a fairly nice essay, originally a public talk, in which, as the title suggests, is developed the analogy between eating well and learning well.)