There are times when someone will offer me something to eat and I will reply "No, thank you. I'm full.' And more often than not, the person will then insist I have something to drink. I find it very interesting that people do not consider the liquids they are consuming as food. "It goes in the same tank" is typically my reply. When the tank is full it's full.
More interesting that people do not view an ice latte with whipped cream as a desert. Yet calorie for calorie and fat to fat---a smoothie, mocha, Long Island Ice Tea, beer etc can be very harmful.
When it comes to fuel-think about the quality and never top it off.