When was Benjamin Franklin a vegan?

Benjamin Franklin was not a vegan in the modern sense, as the term and lifestyle were not defined during his lifetime (1706-1790). However, he did advocate for a vegetarian diet at certain points, particularly in his writings in the 18th century, where he expressed concerns about the ethical treatment of animals and the health benefits of plant-based eating. He even experimented with a vegetarian diet for a period, but it was not a permanent lifestyle choice.