I'm in grad school right now.
1) I know grad students who are struggling financially
There are at least two people in my program (of about 100 total) who I know personally who are struggling to make ends meet. Their families aren't well off and our program doesn't have funding. They're getting along OK, but they have to live very very tightly, skipping any extra curricular activities, not buying text books, and budgeting both money and food.
I assume that others may be struggling and I don't know it.
2) More of us miss out on things so we don't have to starve
A good number of us work full time or more to pay for things. I've had to not participate in school events both social and scholastic, including guest speakers and class outings. It is very difficult to see a teacher during office hours since I'm supposed to be at work.
I'm not missing out on food, but if food were available I might be able to work less and be more involved.