Yes, I never debated that other fruits and veggies might not have more of this or that vitamin just that potatoes have almost half of your daily vit C need.
Aside from which, Vit. C is water soluable so you eat too much and you just pee it out. Take too much and cut back and you can get survey.
Unless of course, you eat too too much and then according to some research in Germany it begins to warp your DNA.
My only point is that potatoes count as a veg in other countries, not that we should only be eating potatoes.
Although in Ireland before the famine many people did just that some young men were eating upwards of 15 potatoes in a meal. YUCK!
Potatoes contain nutrients, such as protein, carbohydrate, and
vitamin C, which are necessary for a healthy diet, but lack vitamin
A and calcium. Combined with milk, potatoes supply almost all food
elements required for a healthy diet.(13) To fulfill the daily
nutritive requirement in the mid-1800s, each person had to eat 3
kilograms (six and a half pounds) of potatoes. According to
historical accounts, a "burley farmer could down 15 potatoes" at
one meal.(14)
http://www.american.edu/ted/potato.htm