Just out of interest, JB's Base contains only 37 kcals/100g. It's a decent base and not too bad for the waistline either! 
I'm sure this is a well-intentioned and well-motivated contribution, but the day that I start concerning myself with the calorific content of anything I eat will be the day I give up cooking, and probably the day I give up eating as well.
** Phil (6' tall, 11 stone 10 pounds, 68 years of age, cooks in dripping and lard, and has never counted a calorie in his life).