During a wedding my focus is on getting the photographs of your day. It’s not always practicable to leave the venue in order to get some food, or be able to keep food fresh throughout a full day. so, I will normally ask for some food refreshments to be made available. I do appreciate that a wedding can be a big investment, so I’m not asking for a 3-course dinner, but at least something substantial that will keep me (and assistant photographer) going for a long day.
A lot of venues will have a ‘vendor’ meal option as part of your booking; and  I’ll never say no to a slice of wedding cake and a coffee!