Diabetes and nutrition: the mitochondrial part.

Diabetes mellitus is the most common genetic disease in the Western world today. It is the phenotype for >150 genotypes. Each of these genotypes is characterized by impaired glucose tolerance and impaired control of intermediary metabolism. There are many strains of mice and rats that can be used to study diabetes in its various forms. One of these is the BHE/Cdb rat, which mimics the human phenotype with a mutation in the mitochondrial (mt) DNA. The result of such mutation is a loss in metabolic control with respect to the role of the mitochondria in this control. This review addresses those aspects of control that are exerted by mt oxidative phosphorylation (OXPHOS). Diet can have both genomic and nongenomic effects on OXPHOS. The type of dietary fat influences the fluidity of the mt membranes and hence, mt function. The dietary fat effect depends on the genetic background of the consumer. Diabetes-prone BHE/Cdb rats with base substitutions in the mt ATPase 6 gene are more likely to be influenced by the diet effect on mt membrane fluidity than are normal rats. Vitamin A also affects mt function through an effect on mt gene expression. BHE/Cdb rats have a greater need for vitamin A than normal rats and supplemental vitamin A appears to influence OXPHOS.