re: Trouble Losing Weight

Alcohol is a big offender for sure. The calories are dense, almost as dense as fat, and will fill you up the least because it's liquid (ie you will be hungry faster after consuming alcohol as opposed to other foods).

4 calories per gram of protein
4 calories per gram of carb
9 calories per gram of fat
7 calories per alcohol % per 100g or 100ml

so 30% liquor... roughly 210 calories per 100ml

Also, FDA allows for nutrition labels to have a margin of error of....brace yourself...20% on calories. Companies know this and the things that are bad for you will generally lie about the calories, but are forced to properly report everything else (such as protein/carb(they cheat on this one a bit with fiber sometimes/fat/alcohol %). Basically all those 5% seltzers say 100 calories and you can calculate it out and they're all 120 calories just as an example.