We have our snacks time between 15:00 and 17:00. Most co-workers are found in the pantry or at some tea stall nearby the office in this time, according to their convenience. Usually the developers will take their snacks when they have reached a logical break in their thought process while writing code. Some teams have a fixed time set for these snacks.
I found out a healthy alternative to try in this snack period. There is a shop at Mate Square at a distance of 2 minutes on a bike. It is in the same building where there is Pizza Time shop known to many.