An Introduction to the Devout Life continues, as St. Francis talks a bit about external or bodily mortification, including stuff like fasting, abstinence, etc. (And hairshirts.) He’s not really all that hep on mortification as an extreme sport. In fact, he’s got a much better idea.
So it’s very plain to see how St. Therese of Lisieux was influenced by St. Francis de Sales in developing her “Little Way”. If eating whatever is set before you, regardless of your own wants, is more of a mortification than extreme fasting, the same principle quickly carries over to other preferences in daily life.
Of course, it could be pointed out that they’re both very French in thinking this way about food preferences. I’m sure the Food Network foodies would agree on how much a mortification of desires this would be to a gourmet.