Fact Check
None of the above are "Fad Diets".
Definition of Fat
It is "
...an intense and widely shared enthusiasm for something, especially one that is short-lived "...
All of these diets have been have been in existence for enormously long period of time.
Ketogenic Diet and Fasting
Fasting and other dietary regimens have been used to treat epilepsy since at least 500 BC. To mimic the metabolism of fasting, the ketogenic diet (KD) was introduced by modern physicians as a treatment for epilepsy in the 1920s. For two decades this therapy was widely used, but with the modern...
pubmed.ncbi.nlm.nih.gov
.
"Fasting and other dietary regimens have been used to treat
epilepsy since at least 500 BC."
Paleo Diet
The Paleo Diet is a modern attempt to replicate the diet of humans of the Paleolithic age. These ancient hunter-gatherers lived before the advent of agriculture and subsisted on lean proteins, eggs, fruits, vegetables, nuts and roots.
www.livescience.com
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..It has actually been around for several decades. It was started around the 1970s by gastroenterologist Walter Voegtlin..."
Vegan Diet
Learn about the history of veganism and the society.
www.vegansociety.com
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"The Vegan Society may have been established 75 years ago but veganism has been around much longer. Evidence of people choosing to avoid animal products can be traced back over 2,000 years."
Carnivore Diet
en.wikipedia.org
"The diet can be traced to the German writer Bernard Moncriff, author of
The Philosophy of the Stomach: Or, An Exclusively Animal Diet, in 1856."