Gardeners' World presenter Arit Anderson has opened up about a health issue that can be connected to Parkinson's disease . The garden designer said she was left heartbroken 10 years ago when her sister Julie, 71, received a diagnosis of the progressive neurodegenerative brain condition that leads to the loss of dopamine-producing neurons. The NHS states that Parkinson's disease primarily causes involuntary shaking of body parts (tremor), slow movement, and rigid, inflexible muscles. Yet Arit