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Fat is one of the major chemicals involved in the digestive system of creatures, introduced in Creatures 2. It is generally broken down into fatty acids, cholesterol and triglyceride, stored as adipose tissue and not created in the body.
Some Creatures 2 genomes had a bug whereby a gene intended to cause heart disease when a norn's consumption of fat was too high was accidentally placed in the uterus, often causing that organ to die off (resulting in infertility) before the norn came of age.
By C3/DS, fat was mainly contained in seed or food sources, and creatures could become hungry for fat.