I wonder if there is subtle difference between "1" and "2".
1. Please eat before it gets cold.
2. Please go ahead and eat before it gets cold.
I agree with Charliedeut.
One might tell a child at a table to "eat it before it gets cold" if they are just sitting there staring at their food, or perhaps outside playing "come and eat before it gets cold" but when there are others waiting to be served in a restaurant, for example, the one waiting would politely insist to the one already served, "Please go ahead and eat..."