When you attend a meeting, class or

My company does not provide anything for meetings unless it's some all day thing, or the meeting is scheduled through lunch.

For classes, those are almost always catered, but those are typically done through a third party.

It depends on the nature of the meeting. All day meetings, yes, there is pretty much always coffee, tea, juice and water in the morning, along with some kind of fruit and pastry. Usually sodas and more water come out mid-morning and get replenished (often with a tray of cookies or something similar) in the afternoon. Depending on if the attendees are from out of town or not, lunch may be provided on-site. If most people are local and/or there is not a huge time crunch, then there's a break for lunch and people are on their own.

For shorter meetings in the morning, there's still usually coffee, tea, and water.

Meetings that are only in the afternoon generally have sodas and water provided.

These are all for meetings that are longer than an hour. Nothing gets provided for one hour or less meetings.

I think the industry is going to make a big difference too. 

For a class (university) no.
For a meeting, it depends on the length and time of the meeting.
A three hour meeting that starts first thing in the morning will likely have some pastry, fruit and coffee.
A short meeting, one hour or less, won't have food or drinks offered.

I attend a lot of meetings as either a volunteer or a consultant -- and almost universally there will be a pitcher of iced water, some small sodas, coffee carafe, fruit plate, nuts or trail mix type thing, some kind of pastry or snack bar, sometimes a boxed lunch.

I think in the situations I'm familiar with, this is a recognition of the fact that many people are coming to this meeting either during their lunch hour or immediately after work and before they have a chance to get home. We often face over an hour of traffic after the meeting, added to an already long day of regular business. The meeting content is difficult and draining (dealing with errors in medical procedures and brainstorming how to make positive changes systemically, for example) so having some kind of relatively nutritious food helps keep the energy up and the tempers stable.

I don't see it as a necessity, but there are times when it is much appreciated.

My husband's company hosts meetings and training sessions throughout the year. They always have a snack and drink bar at the back of the room. Snacks are small packages items (chips, pretzels, nuts, bars, cookies) and drinks are water, sodas, tea and coffee.

Breakfasts and lunches are brought in--boxed style. Dinners are usually out as a group or catered by the hotel.

It's really better for children and adults to have a small refreshment throughout the day rather than large meals with long spans of time in between.

I work for the state and attend a lot of trainings- no snacks provided.
For our own unit meetings we sometimes do
Potluck snacks/food.

We have am staff meetings. We often have coffee and pastries plus some fruit provided. We always have coffee ready though