Animal-derived foods that are high in fat and protein are generally AGE-rich and are prone to further AGE formation during cooking. However, only low molecular weight AGEs are absorbed through diet, and vegetarians have been found to have higher concentrations of overall AGEs compared to non-vegetarians.
AGEs can be produced in the body and in manufactured foods. The accumulation of AGEs may have causative roles in several age-related diseases by forming adducts with proteins and lipids. In preliminary research, AGEs affect nearly every type of cell and molecule in the body and are thought to be one factor in aging and some age-related chronic diseases. They are also believed to play a causative role in the vascular complications of diabetes mellitus.
AGEs have been implicated in Alzheimer's disease and cardiovascular diseases.
According to in vitro research, the mechanism by which AGEs may induce damage is through a process called cross-linking that causes intracellular damage and apoptosis.
Larger, extracellularly derived AGE proteins cannot pass through the basement membrane of the renal corpuscle and must first be degraded into AGE peptides and AGE free adducts. Peripheral macrophage as well as liver sinusoidal endothelial cells and Kupffer cells
have been implicated in this process, although the real-life involvement of the liver has been disputed.
Although the only form suitable for urinary excretion, the breakdown products of AGE — peptides and free adducts — are more aggressive than the AGE proteins from which they are derived, and they can perpetuate related pathology in diabetic patients, even after hyperglycemia has been brought under control.
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