In the Autobiography of Benjamin Franklin, Franklin wrote:

When about 16 years of age I happened to meet with a book, written by one Tryon, recommending a vegetable diet. I determined to go into it. My brother, being yet unmarried, did not keep house, but boarded himself and his apprentices in another family. My refusing to eat flesh occasioned an inconveniency, and I was frequently chid for my singularity. I made myself acquainted with Tryon's manner of preparing some of his dishes, such as boiling potatoes or rice, making hasty pudding, and a few others, and then proposed to my brother, that if he would give me, weekly, half the money he paid for my board, I would board myself. He instantly agreed to it, and I presently found that I could save half what he paid me. This was an additional fund for buying books. But I had another advantage in it. My brother and the rest going from the printing-house to their meals, I remained there alone, and, dispatching presently my light repast, which often was no more than a bisket or a slice of bread, a handful of raisins or a tart from the pastry-cook's, and a glass of water, had the rest of the time till their return for study, in which I made the greater progress, from that greater clearness of head and quicker apprehension which usually attend temperance in eating and drinking.

Tryon refers to Thomas Tryon, who wrote a lot of breathlessly earnest treatises on the horrors of consuming the flesh of God's children, and sparked my own college roommate's brief foray into veganism.

Anyhoo, the book Franklin mentions is most likely Wisdom's Dictates, which has a recipe book, or, as Tryon titled it, A Bill of Fare. Of several excellent Dishes of Food, easily pro∣cured without Flesh and Blood, or the Dying groans of God's innocent and harmless Crea∣tures, which do as far exceed those made of Flesh and Fish, as the Light doth Darkness, or the Day the Night, and will satisfie all the wants of Nature to the highest Degree, which Banquet I present to the Sons of Wis∣dom, and to all such as shall obtain that hap∣py Condition, as to decline that depraved Cu∣stom of Killing and Eating their Fellow-Creatures, and whose desire is to Live accord∣in to the innocent Law of Nature, and do unto all Creatures as they would be done unto; for the highest degree of Sanctity and Religion, is to imitate God, who is the Ma∣ker and Preserver of all things: Consider al∣so, that thy Life is near and dear to thee, the like is to be understood of all other Creatures, as I have at large demonstrated in our Way to Health, Long Life, and Happiness., which is worth a read.

As you can imagine, Franklin didn't last that long. In his own tongue in cheek account:

I believe I have omitted mentioning that, in my first voyage from Boston, being becalm'd off Block Island, our people set about catching cod, and hauled up a great many. Hitherto I had stuck to my resolution of not eating animal food, and on this occasion I consider'd, with my master Tryon, the taking every fish as a kind of unprovoked murder, since none of them had, or ever could do us any injury that might justify the slaughter. All this seemed very reasonable. But I had formerly been a great lover of fish, and, when this came hot out of the frying-pan, it smelt admirably well. I balanc'd some time between principle and inclination, till I recollected that, when the fish were opened, I saw smaller fish taken out of their stomachs; then thought I, "If you eat one another, I don't see why we mayn't eat you." So I din'd upon cod very heartily, and continued to eat with other people, returning only now and then occasionally to a vegetable diet. So convenient a thing is it to be a reasonable creature, since it enables one to find or make a reason for everything one has a mind to do.