I have a patented process to isolate highly bio available poly phenol extract, which is said to have anti obesity effect. Can you test it. If so, i shall send you the extracts.
I am interested in this but not currently working i this area. You may wish to share this to our project page https://www.researchgate.net/project/Collaborative-Book-Project-on-Phytochemistry
There are some published studies regarding anti-obesity properties of green tea polyphenols. You can refer to the attachments to decide what you want to do.