Bad junk food from vending machines is all that's available at the summit, so it's best to bring your own supplies and, above all, a thermos of hot tea or coffee.
There is a vast selection of restaurants and cafes at the summit. 
mnli hypothesis: There is a vast selection of restaurants and cafes at the summit.  premise: Bad junk food from vending machines is all that's available at the summit, so it's best to bring your own supplies and, above all, a thermos of hot tea or coffee.