That's interesting Blondie. In that article they recognise overeating as a 'definite problem' but don't go as far as saying it is a serious sin.
Also, one of the points to consider is whether food is a big thing in 'his' life? It's funny that they talk about this abstract person, a third person who is a male. But I doubt that there are many people who don't consider food as a big thing in their life.
Since I prepare most of our food from scratch, I would find many hours a week spent on - buying/sourcing food, storing food appropriately, preparing and cooking food, serving food and keeping the kitchen clean. I'm not a GB member or Watchtower writer who's only concern is sitting at a table and eating food, not that I would want to be in that situation but it appears that having a healthy love for all things food related is wrong.