I'm unconvinced a calorie isn't a calorie isn't a calorie. Regardless where it ame from. Yes ok I can buy into the idea that some foodstuffs are easier to extract energy from than others but I suspect the difference is slight.
I believe a slice of brown is going to be much the same calories as a slice of white. For sure when I checked different flours they all seems much of a muchness. But there are plenty of places on the Net where you can check to be sure. I suggest everything in moderation. And that excess anything, inc. protein, isn't the best diet.
Yes beer has alcohol that has many calories. Don't binge and you'll probably not be spiking your intentions too much.