On a superficial level, Gaffigan continues to be obsessed with food. It’s definitely food. It always has been. From Hot Pockets to bacon to well, everything else. If he continues to be a glutton for his own punishment, then it is serving him well, indeed. His first book, “Dad is Fat,” debuted last May via Crown Publishing and spent 17 weeks on the New York Times best seller’s list — it came out just this past week in paperback — securing him a deal for a second book of essays, “Food: A Love Story,”...