Abstract
"This meta-analysis supports the long-standing observation that people with Parkinson's tend to have lower BMI than members of the general population. BMI is a proxy for body fat in humans and is calculated using height and weight. This observation was not dependent on the duration of disease.
A number of studies have looked at whether changes in BMI occur prior to the movement features of Parkinson's. These studies are largely in disagreement with one another and differences in the BMI ranges used make them difficult to compare directly. As it stands, there is no compelling literature to suggest that changes in BMI predate the movement problems."
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