 The content of free BMAA in fruit bats was up to 3 mg/g (approximately 30 mM), while that in the broth in which the fruit bats had been cooked was up to 3 mg/250 ml.Cox also observed decline in fruit bat consumption matching the decline in lytico-bodig.Support for the BMAA theory of the Guam disease came from the finding reported in 2016 that chronic dietary exposure of vervet monkeys homozygous for the APOE4 gene (which in humans increases risk of Alzheimer's disease) to the cyanobacterial toxin BMAA produces dense neurofibrillary tangles and sparse amyloid plaques similar to that found in the brains of Chamorro villagers in Guam who died from lytico-bodig.