How a potato can improve blood supply

As temperatures plummeted over the weekend, I – and many others like me – had a tough decision to make: how high shall we turn up the heating? The answer affects not just my bank balance but, more importantly, my health.
I suffer from Raynaud’s phenomenon, in which the small blood vessels in the fingers and toes dramatically contract in response to cold. It’s not just outside temperatures that affect me: just stepping from a warm room into a chilly one can cause my fingers to turn from a healthy pink to an unnatural white and even, in a bad case, a ghastly blue. A few minutes of vigorous arm waving and physical jerks will bring the blood rushing back, but that return of feeling can be eye-wateringly painful.
This is no ordinary response to the cold. Raynaud’s, named after the French medic who first described it, is a debilitating syndrome that is thought to affect as many as 10 million people in the UK; I was diagnosed 10 years ago when I was 33. During an attack, the blood supply to fingers and toes (and sometimes ears and nose) is interrupted, causing not only vivid colour change but also numbness and discomfort. The cause of Raynaud’s is not known, but it may occur spontaneously without any other condition being present (primary Raynaud’s) or, less commonly, be associated with an underlying condition such as scleroderma, an autoimmune disorder affecting the skin (secondary Raynaud’s).

Source  - Telegraph