I think you're on to something. Alcoholic beverages are one of the most common sources of "empty" calories - they do not provide nutrition (for the most part), and a typical alcoholic beverage has at least 150 calories. Count the number of alcoholic drinks you have a week and multiply by 150 - it adds up pretty quick!
No, what you eat is matter. i think acohol doesn't contain any fatty substances. Most of liquids are free from fat.