It has been seven years since I tried to find researches or philosophers who might be interested in fruitarianism. Back then I have joined ResearchGate.net but nobody seemed to be involved into anything close to fruitarian diet or ethics. I left this note on my profile (researchgate.net/profile/Lena_Nechet):

Hi, I have joined this site for scientist (not being one myself) to find someone who is interested in researching nutritional aspect of fruitarianism. I hoped someone would be interested in a case study. I gave up, maybe too early. I'll keep this profile for the history, without participation, but you are welcome to contact me directly - thank you!

I am not as eager anymore to offer my time for this purpose, but I will definitely consider serious offers.