I teach English in a foreign country. In some of my classes, I use textbooks provided by my employer. When I reach the review unit about how pets are getting too fat and this is terrible, I am forced to teach my students how terrible fat is. I could probably skip it without anyone else finding out, but I am afraid students would wonder why I skipped that page and make assumptions about me. So I don’t teach this unit as well as the others because I don’t really want the students to understand the garbage that is written in the book. I do take care to point out that feeding your pet chocolate is bad not because oh noes the pet will get fat, as the book says, but because a strong dose of chocolate will KILL a cat or dog. I’ve seen English textbooks fail horribly at talking about controversial subjects before, but weight, dieting, and food policing aren’t even considered controversial enough to avoid, so they crop up in all kinds of places.