During an interview on WNYC with Leonard Lopate to promote his new book, The Food Matters Cookbook (full interview below), Mark Bittman hinted that he is currently working on a diet book, presumably based on his personal shift toward a "lessmeatarian" approach to eating and cooking.
Mention of the diet book came up as Bittman was describing his current lifestyle: a vegan by day with a return to more omnivorous habits by night. Lopate asked whether his latest cookbook was essentially a diet book (4:07). It's not, Bittman responded, because he is currently at work writing one:
LEONARD LOPATE: So, is this the Mark Bittman diet book under another name?
MARK BITTMAN: Well, I can't say that because I'm working on the Mark Bittman diet book, so of course -- of course, this is what I do for a living after all.
Here's hoping the eventual title will be "Part-Time Vegans Don't Get Fat," but that's pure speculation.