Iron depletion by phlebotomy improves insulin resistance in patients with nonalcoholic fatty liver disease and hyperferritinemia: Evidence from a case-control study

Luca Valenti, Anna Ludovica Fracanzani, Paola Dongiovanni, Elisabetta Bugianesi, Giulio Marchesini, Paola Manzini, Ester Vanni, Silvia Fargion

Research output: Contribution to journalArticle

Abstract

OBJECTIVES: Hyperferritinemia is frequently observed in nonalcoholic fatty liver disease (NAFLD), the hepatic manifestation of the metabolic syndrome characterized by hepatic insulin resistance and considered high cardiovascular risk. Iron depletion by phlebotomy has been reported to decrease insulin resistance in NAFLD in small, uncontrolled studies. Aims of this study were to define the relationship between ferritin and iron stores in patients with NAFLD, the effect of iron depletion on insulin resistance, and whether basal ferritin levels influence treatment outcome. METHODS: Subjects were included if ferritin and/or ALT were persistently elevated after 4 months of standard therapy. Sixty-four phlebotomized subjects were matched 1:1 for age, sex, ferritin, obesity, and ALT levels with patients who underwent lifestyle modifications only. Insulin resistance was evaluated by insulin levels, determined by RIA and the HOMA-R index, at baseline and after 8 months. RESULTS: Baseline ferritin levels were associated with body iron stores (P <0.0001). Iron depletion produced a significantly larger decrease in insulin resistance (P = 0.0016 for insulin, P = 0.0042 for HOMA-R) compared with nutritional counseling alone, independent of changes in BMI, baseline HOMA-R, and the presence of the metabolic syndrome. Iron depletion was more effective in reducing HOMA-R in patients in the top two tertiles of ferritin concentrations (P <0.05 vs controls), and in carriers of the mutations in the HFE gene of hereditary hemochromatosis (P <0.05 vs noncarriers). CONCLUSIONS: Given that phlebotomy reduces insulin resistance, which is associated with liver tissue damage, future studies should evaluate the effect of iron depletion on liver histology and cardiovascular end points.

Original languageEnglish
Pages (from-to)1251-1258
Number of pages8
JournalAmerican Journal of Gastroenterology
Volume102
Issue number6
DOIs
Publication statusPublished - Jun 2007

    Fingerprint

ASJC Scopus subject areas

  • Gastroenterology

Cite this