Craft S, Peskind E, Schwartz MW, Schellenberg GD, Raskind M, Porte D.
Cerebrospinal fluid and plasma insulin levels in Alzheimer's disease: relationship to severity of dementia and apolipoprotein E genotype.Neurology.
PubMed Abstract, View on AlzSWAN
Insulin levels are one indicator of sugar metabolism and could be associated with glycation or radical formation. In this particular sense, this paper may be interesting in clarification of amyloid formation mechanism.