Article: [Fat, sugar cause bacterial changes that may relate to loss of cognitive function](http://oregonstate.edu/ua/ncs/archives/2015/jun/fat-sugar-ca...)
Study: [Relationships between diet-related changes in the gut microbiome and cognitive flexibility](http://www.sciencedirect.com/science/article/pii/S0306452215...)
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Article: [This is your brain on sugar: UCLA study shows high-fructose diet sabotages learning, memory](http://newsroom.ucla.edu/releases/this-is-your-brain-on-suga...)
Study: ['Metabolic syndrome' in the brain: deficiency in omega-3 fatty acid exacerbates dysfunctions in insulin receptor signalling and cognition.](http://www.ncbi.nlm.nih.gov/pubmed/22473784)
Also: [Systems Nutrigenomics Reveals Brain Gene Networks Linking Metabolic and Brain Disorders](http://www.sciencedirect.com/science/article/pii/S2352396416...)