I regularly do full day meetings with a working lunch in another city.
What this looks like in real life is:
7am leave the house after rushing around to get DD ready for school, no time for breakfast, make a coffee to drink on the way to the train station.
1hr train to London, then tube to Vauxhall, then walk to office.
12.30 - 'working lunch' = really shitty selection of stale sandwiches delivered to room, not enough for everyone so have maybe half a sandwich, spread out over an hour taking a bite in between discussions.
5.30 - meeting finishes, feeling a bit knackered from lack of food and being stuck in a room all day, rush to tube as need to get home ASAP to stand a chance of seeing DD before she falls asleep.
If I'm lucky I'll catch the 6.04 train in which case I'll have a bag of crisps and a chocolate bar from the trolley. If not I'll get a meal deal from m&s which I eat on the train.
The alternative would be waiting till after I have gotten home and put DD to bed so I would be eating my first real food of the day at about 8.30pm
I've tried taking lunch with me, but by the time it's been lugged about in a bag for a drive, walk, train, tube, walk and sat in a hot room for several hours, it's a bit manky.