Disclaimer: This post was intended as a joke. I made this because I was bored.
|Fan art theorizing what a lime blood troll would like
Now, here is my actual theory. The lime bloods had the psychic powers that allowed them to realize the content of what they are eating. So, Her Imperious Condescension, wanting to prevent her sales from plummeting and prevent a public relations nightmare, had all the lime bloods exterminated.
What is my logic? Firstly, it seems highly unlikely the lime bloods just happened to become extinct while being hunted. So, them being wiped out was clearly intentional. Second, nothing in the story mentions how old the Alternian Soft Drink is. This combined with the lack of any real indication of when the lime bloods died means the lime bloods could have been around when the soda was introduced. Next, Calliope mentioned the lime bloods had unusual powers. The psychic food power would be unusual since the trolls usually have more traditional psychic powers such as telekinesis, mind control, future sight and so on. Lastly, their powers was probably not very useful if they all able to be killed off. If they say had the ability to calm down trolls (a popular theory), why didn't they just use that power to save themselves?