Hello Waguma George ,

This is an interesting question. I think animal model researches are expensive. So you can start with other chemical characterization of different starches from various botanical sources commonly used in human foods. Then you can try the animal study if you see differences in digestibility (in vitro), glycemic response and so on.

Starch is the single most studied bio polymer. I believe there are enough information out there if you want review literature before deciding what exactly is worth working on. I know there are significant number of papers published in recent years on the rapidly digestible starch (RDS), slowly digestible starch (SDS) and resistant starch (RS) proportions of total starches from different sources. It may also be worthy looking at the waxy versus normal starch polymer types based on their amylose and amylopectin contents.

Go for in vitro studies with rapid enzyme assay methods