Hello Montathip,

Natural medicine could play a pivotal role in management of obesity. Since it is unclear on what aspects of obesity you wish to work, it would be difficult to suggest anything specific. You can look for general understanding of the subject from the following link.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2791327/

I shall be happy to help you further with the project if you could discuss details of what you wish to do.

Best wishes,

Apar