Just to clarify, the meal is only served in F. If you're in regular Acela business class, you generally have to grab food in the dining car or bring food on board.

Earlier in the year they had a cart (with pay food) on a few of the Acelas I took, but since I've upgraded on all the Acela trips I've taken since June, I'm not sure if that's something they're still trialing and/or a normal feature. Perhaps someone who rides more than me could confirm.

But if you're in F, count on a meal. If not, count on needing to pay or bring food on.