Voigt started the 20-potatoes-a-day as part of a PR campaign to prove you can live healthily on potatoes alone.
On his blog he wrote: "In an effort to remind the public about the nutritional value of potatoes, I am going on a diet consisting of only potatoes, nothing else. No toppings, no chili, no sour cream, no cheese, no gravy, just potatoes and maybe some seasonings or herbs and a little oil for some of the cooking.
"I want to show the world that the potato is so healthy, that you could live off them alone for an extended period of time, without any negative impact to your health. And who knows, maybe it will make me healthier by lowering my blood pressure and cholesterol?"
Voigt started the diet on October 1 and will finish on November 29.
Along with his online blog, he is also posting videos and comments about how the diet is going and some interesting trivia about the potato.
Each Monday he also announces a contest for the week where readers could win some potato goodies.
Go to www.20potatoesaday.com or the Facebook group 20 Potatoes A Dayto find out more.