Diet variety is related to gut microbiome diversity and a greater abundance of some potentially beneficial bacteria. A new study suggests how increasing the quantity and diversity of dietary fiber intake by consuming multi-fiber bread may improve cholesterol and insulin resistance by altering gut microbiome composition and function.

While we have known for a while that a diet consisting of fiber-rich foods reduces the risk of developing chronic diseases and lowers people’s mortality rate, scientists have only recently started elucidating why fiber is beneficial for human health. This article clarifies the definition and health implications of the closely related terms fiber, MACs and prebiotics.