title_body: Which are the most caloric beers? Are there, say, visual criteria to identify them?
upvoted_answer: No. Color has little to do with calories, and possibly surprisingly, mouthfeel can have little influence also.
  
  You can have a Belgian Tripel that is medium light bodied, that has many more calories than a pint of Guinness, simply because the alcohol level in the Tripel contributes more calories than the sugars from Guinness. Also Guinness is served on Nitrogen which creates the sensation of a thicker beer, as if there were more carbs and protein giving a fuller body.
  
  The calorific load from a beer comes from both carbohydrates and alcohol, which are present in both dark and light beers regardless of beer color.