Yes, we do need to eat animal fat.
One of the largest organs in the human body is the brain. The brain is made up of billions of neurons. Each neuron is surrounded by an insulating layer called the myelin sheath.
The myelin sheath is made up mainly of .... FAT. Fat is made up of complex long chain fatty acids. The human gut cannot manufacture this from vegetable matter, only ruminants and hind gut fermenters are able to break down cellulose.
Please all of you anxiety riddled people, stop torturing yourselves and have a CHEESE sandwich made with BUTTER. Have a full cream yoghurt and drink a glass of milk! You have those cravings because your body is screaming at you to feed it properly!
And never, ever put children on your silly neurotic regime. Thank goodness it is outlawed in Italy as child abuse, and there have been prosecutions in Australia.
"Development[edit]
The process of generating myelin is called myelination or myelinogenesis. In the CNS, cells called oligodendrocyte precursor cells (OPCs; the precursors of oligodendrocytes) differentiate into mature oligodendrocytes, which form myelin. In humans, myelination begins early in the 3rd trimester,[10] although only little myelin is present in either the CNS or the PNS at the time of birth. During infancy, myelination progresses rapidly, with increasing numbers of axons acquiring myelin sheaths. This corresponds with the development of cognitive and motor skills, including language comprehension, speech acquisition, crawling and walking. Myelination continues through adolescence and early adulthood and although largely complete at this time, myelin sheaths can be added in grey matter regions such as the cerebral cortex, throughout life.[11][12][13]"