High Blood Sugar After Meals May Raise Alzheimer's Risk by 31%

A new study has linked higher blood sugar levels after meals to an increased risk of Alzheimer's disease. Researchers from the University of Melbourne analysed data from over 350,000 people, uncovering a concerning connection between post-meal glucose spikes and future brain health.

The team, led by Weiping Jia, examined records from 357,883 participants in the UK Biobank. Using Mendelian randomisation, they focused on genetic factors that influence how blood sugar rises after eating. Their findings, published in Diabetologia in November 2024, revealed that each 1 mmol/L increase in post-meal glucose raised Alzheimer's risk by 31%.

Participants with genes predisposing them to higher blood sugar after meals faced a 69% greater likelihood of developing the disease. However, the study found no link between these glucose traits and visible brain changes on MRI scans. Experts suggest simple lifestyle adjustments to help manage blood sugar spikes. Eating more protein or fibre, choosing whole foods, and light activity after meals may reduce the risk. Further research is still needed to confirm these results in wider populations and explore the biological mechanisms involved.

The study highlights a potential way to lower Alzheimer's risk by controlling blood sugar after eating. While more research is required, the findings offer a clear target for prevention strategies. Public health guidance may soon reflect these insights to help protect long-term brain health.