Due to increasingly unrealistic and unsustainable demands for cheap meat and dairy, something had to give. In order to supply a portion of the market with cheap meat, certain agricultural institutions started to modify the feeding and rearing practices of animals to make them more effective meat and dairy producers. Some animals are now fed on a processed feed which is high in grain, especially corn and soya, as it means that the cows can be fattened up quickly and cheaply. Grain breaks down into glucose which causes the animal to quickly gain weight. For dairy cows it also means that they have sufficient nutrients to keep producing milk throughout the Winter months when grass is lacking.