New research from Lund University in Sweden has shown that intestinal bacteria can accelerate the development of Alzheimer’s disease.
Exactly how our gut microbiota composition is composed depends on which bacteria we receive at birth, our genes and our diet. By studying both healthy and diseased mice, the researchers found that mice suffering from Alzheimer’s have a different composition of gut bacteria compared to mice that are healthy.
The researchers also studied Alzheimer’s disease in mice that completely lacked bacteria to further test the relationship between intestinal bacteria and the disease. Mice without bacteria had a significantly smaller amount of beta-amyloid plaque in the brain. Beta-amyloid plaques are the lumps that form at the nerve fibres in cases of Alzheimer’s disease.
To clarify the link between intestinal flora and the occurrence of the disease, the researchers transferred intestinal bacteria from diseased mice to germ-free mice, and discovered that the mice developed more beta-amyloid plaques in the brain compared to if they had received bacteria from healthy mice.
According to researcher Frida Fåk Hållenius at the Food for Health Science Centre:
Our study is unique as it shows a direct causal link between gut bacteria and Alzheimer’s disease. It was striking that the mice which completely lacked bacteria developed much less plaque in the brain. The results mean that we can now begin researching ways to prevent the disease and delay the onset. We consider this to be a major breakthrough as we used to only be able to give symptom-relieving antiretroviral drugs.