In the Platonic school of philosophy, the Demiurge is a deity who fashions the physical world in the light of eternal ideas. In the Timaeus, Plato credits the Demiurge with taking preexisting materials of chaos and arranging them in accordance with the models of eternal forms.
Oatmeal does not turn into starch, because it is already mostly starch. In a serving of 1/2 cup of dry old-fashioned oats, 22 g of the 27 g of total carbohydrates are starches. Starches correspond to a chain of glucose, or sugar, linked together.
Grains (wheat, rice, barley, oats), potatoes, corn, and beans are all very starchy foods. Grains are made into bread, cereal and pasta, as well as crackers, biscuits, cookies, cakes, pie crust, and anything else made with flour. There are several factors at work: What is done to the starch before we eat it.