TNF and Alzheimer disease: Intestinal inflammation could contribute to the systemic inflammation widely reported in the literature, such as the meta‐analysis of 175 studies, including 13,344 AD subjects, reporting elevated pro‐inflammatory markers tumor necrosis factor α (TNFα), interleukin (IL)‐2, IL‐6, IL‐8, interferon‐ γ, and C‐reactive protein compared to healthy controls.11, 12