Not always. Cabin bookings in every category except Classic Monohull include a Host and half-board, meaning six breakfasts, six lunches and two dinners cooked on board, with the food included. Classic Monohull cabins and full yacht bookings don't include food. Full yacht bookings can add a Host, but the Host's fee doesn't cover the food.
For how food, drinks and provisioning work on each type of booking, see Is food and drink included?