To those who doubted he was getting enough variety in his diet, he argued otherwise saying he thought potatoes had enough protein, fat, vitamin C and iron.
The reason why he embarked on such a radical diet, he said, was his prior food addiction to soft drink, deep-fried food, icecream, cake, chocolate and a lot of pizza.
It must be hard to cure yourself of a food addiction because unlike a substance like alcohol or cigarettes, a food addict cannot give up the object of his or her addition because everyone still has to eat.
To try to cure one extreme diet of fast food, by adopting another extreme diet of potatoes seems to me a bit like trading one unhealthy diet for another.
One commenter on social media said there was nothing wrong with a potato diet, and the Irish had survived on it for years.
But that was because they had to, not out of choice.
Then again, when it comes to losing weight it seems we will try anything - from surviving on lemons and syrup, to cabbages, to juice diets, to no-carb diets, to fast days.
In seeking such a quick fix, the only thing you lose is the money from your bank account.
Far better to eat a healthier diet for life, or not put on weight in the first instance.
Hard advice though, particularly at this time of year.
But come Christmas Day, I am going to pile my plate high with roast potatoes and potato salad.