I think the 110 calorie info is for Guinness lager, a relatively new product.
I found this though. Still suprising. For the way it fills you up, I woulda thought 500 calories.
Guinness is no more fattening or calorific than any other beer of similar alcoholic strength. The beer has no fat, however it does contain protein, sugar, carbohydrates and alcohol. The alcohol accounts for 65-75% of the calorific content irrespective of the beer in question. Per pint, Draught Guinness has 210 calories; as a reference, one pint of semi-skimmed milk has 260 calories and one pint of orange juice has 220 calories. Draught Guinness actually has fewer calories than most other premium beers and lagers.
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