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Analysis of body composition and nutritional status in Brazilian phenylketonuria patients.

ABSTRACT: BACKGROUND:Phenylketonuria (PKU) is characterized by phenylalanine (Phe) accumulation to toxic levels due to the low activity of phenylalanine-hydroxylase. PKU patients must follow a Phe-restricted diet, which may put them in risk of nutritional disturbances. Therefore, we aimed to characterize body composition parameters and nutritional status in Brazilian PKU patients also considering their metabolic control. METHODS:Twenty-seven treated PKU patients older than 5 years, and 27 age- and gender-matched controls, were analyzed for anthropometric features and body composition by bioelectrical impedance (BIA). Patients' metabolic control was assessed by historical Phe levels. RESULTS:There was no effect of PKU type, time of diagnosis, or metabolic control for any analyzed parameter. About 75% of patients and controls were eutrophic, according to their BMI values. There were no difference between groups regarding body composition and other BIA-derived parameters. CONCLUSIONS:Brazilian PKU patients do not show differences in body composition and nutritional status in comparison with controls, regardless metabolic control. Although similar to controls, PKU patients may be in risk of disturbed nutritional and metabolic markers as seen for the general population.

SUBMITTER: Mazzola PN

PROVIDER: S-EPMC4789337 | biostudies-literature | 2016 Mar

REPOSITORIES: biostudies-literature

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Analysis of body composition and nutritional status in Brazilian phenylketonuria patients.

Mazzola Priscila Nicolao PN Nalin Tatiele T Castro Kamila K van Rijn Margreet M Derks Terry G J TG Perry Ingrid D S ID Mainieri Alberto Scofano AS Schwartz Ida Vanessa D IV

Molecular genetics and metabolism reports 20160109

<h4>Background</h4>Phenylketonuria (PKU) is characterized by phenylalanine (Phe) accumulation to toxic levels due to the low activity of phenylalanine-hydroxylase. PKU patients must follow a Phe-restricted diet, which may put them in risk of nutritional disturbances. Therefore, we aimed to characterize body composition parameters and nutritional status in Brazilian PKU patients also considering their metabolic control.<h4>Methods</h4>Twenty-seven treated PKU patients older than 5 years, and 27 a ...[more]

PMID: 27014574

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Project description:BACKGROUND:In patients with phenylketonuria (PKU), a low-phenylalanine (Phe) diet supplemented with low-protein foods and a Phe-free amino acid mixture favors a dietary intake rich in carbohydrates, but little is known about how these molecules are metabolized in this setting. The objective of the present study was to analyze carbohydrate metabolism in patients with hyperphenylalaninemia. METHODS:We conducted a multicenter cross-sectional study to investigate biochemical markers of basal and postprandial carbohydrate metabolism in PKU patients according to age, Phe tolerance, waist circumference and body mass index (BMI), diet, tetrahydrobiopterin (BH4) supplementation, and adherence to treatment. Basal biomarkers and anthropometric parameters were also evaluated in patients with mild hyperphenylalaninemia (MHPA) and in healthy controls. RESULTS:A total of 83 patients aged 4-52 years were studied; 68.7% had PKU and 31.3% had MHPA. 68 healthy controls of similar sex and age were also evaluated Metabolic control was adequate in 71.9% of PKU patients. Fasting glucose levels (mean 80.77?±?8.06 mg/dL) were high in just one patient, but fasting insulin levels, with a mean of 12.74?±?8.4 mIU/L, were altered in 15 PKU patients (26.3%) and markedly higher than in patients with MPHA (p?=?0.035). Fasting insulin levels and Homeostasis Model Assessment Insulin Resistance (HOMA-IR) were significantly higher than in healthy controls and correlated with body mass index, waist circumference, age, and also showed statistically significant differences according to diagnosis and Phe tolerance (p?<?0.05). Patients under BH4 therapy had lower insulin levels and HOMA-IR. A higher mean carbohydrate intake from AA mixtures was observed in classic PKU patients. The caloric intake in the form of carbohydrates was also higher in PKU than MHPA patients (p?=?0.038) and it was correlated with basal insulin (rho?=?0.468, p?=?0.006), HOMA-IR (rho?=?0.423, p?=?0.02), BMI (rho 0.533, p?=?0.002), and waist circumference (rho 0.584, p?=?0.0007). CONCLUSIONS:This study shows that PKU patients are at risk of carbohydrate intolerance and insulin resistance, more evident in adults and overweight patients, probably related to their higher caloric intake in form carbohydrate content. A higher dependency of AA mixtures was demonstrated in PKU patients.

Dataset Information

Analysis of body composition and nutritional status in Brazilian phenylketonuria patients.

Publications

Analysis of body composition and nutritional status in Brazilian phenylketonuria patients.

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