Analysis of information sources in references of the Wikipedia article "வெதுப்பி" in Tamil language version.
In the past, maize (corn), barley, oats, sorghum, millet and rice have all found their way into bread products at some time, usually when wheat and rye have been in short supply.
Wheat, in the form of bread, provides more nutrients to the world population than any other single food source.
Aside from bread wheat and durum, other types of wheat include spelt, emmer, einkorn and kamut. These wheat varieties are commonly referred to as 'ancient' grains and are increasingly being used in the manufacture of niche wheat-based food products.
Generally however they do not heat it up at all, but only use the dough kept over from the day before; manifestly it is natural for sourness to make the dough ferment,