If you are that concerned about the calories you're ingesting, you have two options that allow you to retain your self-respect:
1. Drink water.
2. Run another half-mile and drink real beer.
The following things must never happen:
1. Singing songs about light beer.
2. Pretending that light beer is part of a balanced lifestyle, or anything other than watered-down horse piss.
3. Drinking light beer.