Why does low calorie stuff ALWAYS taste worse than the original?

I’m having a nice relaxing drink, vodka and lemon bitters. Except stupid me I picked up the low calorie version of lemon bitters – I nearly spewed the mouthful out when I took a swig earlier! It tastes absolutely awful!

Keefe mentioned at work that the shops should have a section for normal (high fat, high sugar, whatever) foods, and then a section for their low calorie “healthy” equivalents. Not a bad idea actually. Most of us would be standing in front of the “real” stuff, drooling and/or wistfully dreaming, knowing that the “healthy” stuff is what we should be getting.