when it comes to big portions, its more about the buffets - we try to not overeat, but even if you just try a little of everything you wind up with a ton of food...and true the dinner portions arent huge, but dinner is usually after 2 appetizers, a salad/soup and bread, and then there is dessert
to be fair, we are both close to health nuts - barely use oil in any cooking, and havent bought real butter in years...so any digression from that is a big step for us! maybe thats why we eat so much on the cruise - we deprive ourselves so much during the rest of the year that we just can't control ourselves when given so many great options