It is hard for me to believe there is much similarity at all between a human being and a fruit fly.
That’s because you are heartless and don’t care if the poor fruit fly becomes obese and insulin dependent. Can you even imagine the effort it takes him to prick his little legs and use glucose test strips? No, you cannot. And the syringes! I’m not sure they even make them that small.
Yes outwardly fruit flies don’t look anything like humans but there are other factors.
https://www.mpg.de/10973625/why-do-scientists-investigate-fruit-flies