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The clinical symptoms and nutritional status of patients with Parkinson's disease (PwP) are interrelated, and the clinical outcomes in malnourished patients are often poor. Only a few studies have reviewed the prevalence of malnutrition and nutrition-related risk factors in PwP. To explore the prevalence of malnutrition/ malnutrition risk among PwP, and estimate nutrition-related risk factors. PubMed, EMBASE, and Cochrane Library were systematically searched. Literatures published between 1 January 1995 and 1 November 2020, subjects were patients with idiopathic PD underwent Mini Nutritional Assessment (MNA) were included. Sixteen articles, including 1650 PwP from 13 countries/regions, were included in the meta-analysis. The prevalence of malnutrition and malnutrition risk were 8.8% (Confidence interval [CI] 95%, 5.3%–12.2%) and 35.3% (CI 95%, 29.0%–41.7%), and the prevalence of nutritional disorders was 42.3% (CI 95%, 33.7%–51%). The prevalence of malnutrition in developing countries was higher than that in the developed countries. Meta-analysis reveals there were significant differences in the course of the disease (0.88 years; 95% CI, 0.26–1.50), levodopa equivalent daily dose (LEDD; 60.77 mg/day; 95% CI, 2.7–118.8), Hoehn and Yahr (H&amp;Y) staging (0.323; CI 95%, 0.164–0.482), and unified Parkinson's disease rating scale (UPDRS) scores (total: 13.66, CI 95%: 10.57–16.75 and part III: 5.52, CI 95%: 3.79–7.25) between normal and nutritional disorder groups. Malnutrition/malnutrition risk prevalence in PwP are high. The duration of the disease, LEDD, H&amp;Y staging, and UPDRS score (part III and total) may be nutrition-related risk factors in PwP.

nutritional neuroscience

Prevalence of malnutrition/malnutrition risk and nutrition-related risk factors among patients with Parkinson’s disease: systematic review and meta-analysis