Food stalls/small hotels outside the KCG station, opposite to the main entrance are kept open until 2 am in the morning. If you have a 10 minute halt of your train or making a mid night transfer at KCG, don't worry, you would still get food outside the KCG station.
Food available: Tea(Irani & Andhra), biscuits, Samosa, Parotha, fried rice (egg, veg, chicken), noodles(egg, veg, chicken). Apart from this you would get all bottled non-alcoholic beverages.
Note: This Food won't be of great quality.