Patients with Parkinson's disease tend to lose weight although the rea
sons are uncertain. Fifteen patients with stable Parkinson's disease w
ho had lost at least 5 kg in weight, and 15 age- and sex-matched contr
ol subjects were studied. All subjects underwent physical examination,
anthropometric measurements, biochemical and haematological screening
, measurement of tumour necrosis factor and full dietary assessment. T
he Parkinson's disease patients who had lost a mean of 6.2 kg had sign
ificantly less body fat and a lower total peripheral lymphocyte count
than the control subjects. Dietary analysis showed a higher daily inta
ke of calories in the patients which was derived from an increased car
bohydrate intake. Tumour necrosis factor was not detected in either th
e patients or control subjects. Parkinson's disease patients lose weig
ht in spite of an increased calorie intake. This may reflect an increa
sed metabolic rate.