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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Carbohydrate- and lipid-enriched meals acutely disrupt glycemic homeostasis by inducing transient insulin resistance in rats

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Author(s):
Campello, Raquel Saldanha [1] ; Teixeira Alves-Wagner, Ana Barbara [1] ; Abdulkader, Fernando [1] ; Tieko Mori, Rosana Cristina [1] ; Machado, Ubiratan Fabres [1]
Total Authors: 5
Affiliation:
[1] Univ Sao Paulo, Inst Biomed Sci, Dept Physiol & Biophys, BR-05088900 Sao Paulo - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Canadian Journal of Physiology and Pharmacology; v. 90, n. 5, p. 537-545, MAY 2012.
Web of Science Citations: 7
Abstract

Chronic intake of high-carbohydrate or high-lipid diets is a well-known insulin resistance inducer. This study investigates the immediate effect (1-6 h) of a carbohydrate-or lipid-enriched meal on insulin sensitivity. Fasted rats were refed with standard, carbohydrate-enriched (C), or lipid-enriched (L) meal. Plasma insulin, glucose, and non-esterified fatty acids (NEFA) were measured at 1, 2, 4, and 6 h of refeeding. The glucose-insulin index showed that either carbohydrates or lipids decreased insulin sensitivity at 2 h of refeeding. At this time point, insulin tolerance tests (ITTs) and glucose tolerance tests (GTTs) detected insulin resistance in C rats, while GTT confirmed it in L rats. Reduced glycogen and phosphorylated AKT and GSK3 content revealed hepatic insulin resistance in C rats. Reduced glucose uptake in skeletal muscle subjected to the fatty acid concentration that mimics the high NEFA level of L rats suggests insulin resistance in these animals is mainly in muscle. In conclusion, carbohydrate-or lipid-enriched meals acutely disrupt glycemic homeostasis, inducing a transient insulin resistance, which seems to involve liver and skeletal muscle, respectively. Thus, the insulin resistance observed when those types of diets are chronically consumed may be an evolution of repeated episodes of this transient insulin resistance. (AU)

FAPESP's process: 07/50554-1 - Glucose transporters and diabetes mellitus: contribution to the knowledge of glycemic control and chronic diseases development
Grantee:Ubiratan Fabres Machado
Support type: Research Projects - Thematic Grants