" Sponsorship

The trial was funded by the German Federal Ministry of Education and Research (BMBF), the German Diabetes Association (DDG), the German Research Foundation (DFG), the German Cereal Processing, Milling and Starch Industries’ Association (VGMS), and RASO Naturprodukte."

I'd be quite suspicious of this study for this reason alone.

"They also lost two kilos in weight on average and their blood pressure fell slightly."

Two kilos in two days?

Edit: Oatmeal is great. I have some most mornings, either as porridge or letting it soak for a bit in "viscous mesophilic fermented milk", as Wikipedia suggests it can be called in english. Lots of starch but it takes a while for it to sugar the blood, and some fiber and protein.