Researchers at USC found that people with Type 2 diabetes who don’t take medication develop signs of Alzheimer’s disease much faster than those who do. In fact, untreated diabetes patients showed Alzheimer related changes in the brain 1.6 times faster than people without diabetes. The study suggests that keeping diabetes under control with medication may also help protect the brain.
The scientists studied nearly 1,300 people aged 55 and older. Some had normal blood sugar, some had prediabetes, and some had type 2 diabetes (treated or untreated). They tracked participants for up to 10 years, looking at memory test results, brain scans, and spinal fluid. They focused on tau tangles and amyloid plaques, which are brain changes strongly linked to Alzheimer’s. They found that untreated diabetes sped up the buildup of these harmful changes, while people taking diabetes medicine showed slower progression.
The study doesn’t prove exactly why diabetes medications might protect the brain, but it points to an important connection between metabolic diseases like diabetes and brain health. Scientists now think Alzheimer’s isn’t caused by just one factor, but by many, including genetics, heart disease, and conditions like diabetes. This research highlights the importance of catching and treating diabetes early, not only to protect the body but also to keep the brain healthier for longer.
