At midday, you can eat at the École des Ponts canteen (from 11:30 am to 2 pm). On arrival at the School, you will be issued with a magnetic card, which holds an account. Once you have put money in this account, you can use the card to pay at the canteen and the cafeteria, but only at École des Ponts of course.

You can also eat at the CROUS, next to the School (a book of 10 tickets costs about 27 €).

The École des Ponts canteen and cafeteria and the CROUS are closed in the evenings and at weekends.
Your Student Card entitles you to eat in all university canteens.