What would be an unnatural fat burner?

Sometimes words/products make me think, let's say as an example it's popular to tout different types of natural fat burner yet, they don't call ones that are not from nature, "unnatural fat burners" -- what if they did? Would visions of witchcraft dance in your heads? Some magical unnatural presence appears to make the fat go *poof*? Ancient shamans appearing at your doorstep to make the fat go away?

As I ponder that, I also ponder why it is whenever I write about any type of diet or fat burning product I'm always hungry for something totally not a diet food...