That's what I always tell my son wn he makes dinner, pls give me a small portion, if I want more, I'll take it, bcs sometimes, if I see too much food on the plate, I don't even want to eat.

You start to stiffen and maybe a twitch in your arms or legs

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Most neurologists go by symptoms and by the person's response to carbidopa-levodopa. Sometimes it takes time for symptoms to worsen to an extent that make it more obvious whether someone has PD or another Parkinsonism. There is a skin test that says whether or not someone has Parkinsonism (including PD) but it is new so probably not widely available yet.