The in vivo oxidation of lipids and lipid-containing molecules has been discovered to be initiated by the concurrent reaction of such lipid materials with reducing sugars such as glucose, advanced glycosylation endproducts such as AGE-peptides, or a compound which forms advanced glycosylation endproducts, to form materials or particles known as AGE-lipids. AGE-lipids have been implicated in the aging process, the abnormal formation of lipofuscin and in various disease states such as diabetes, atherosclerosis, and stroke. Methods of treating stroke, and especially inhibiting the infarct size of stroke, using agents which inhibit the formation of AGE-lipids are disclosed. Additionally, a method of screening for neuroprotective agents which can be used to reduce the size and severity of the infarct size is disclosed.