No, it's really not. Same reason I said before. Lack of a rule or detail does not imply it does not exist in 5e. They explicitly cut down on the huge list of simulation-centric rules of earlier editions. They streamlined things, leaving out a lot of details, and told the DMs to put in those details that matter for their world. Rulings, not rules. So lack of a detail is not a proof of anything except that detail is not needed mechanically for most gameplay and that they trust thje DMs to introduce something if it is.
Again, doing the same amount of activity you will burn a hell of a less calories with the greatly reduced weight. Eatting many smaller meals is actually a weight reduction strategy in the modern world.