A sedentary lifestyle is one of the biggest perpetrators of declining brain health. According to the Alzheimer's Drug Discovery Foundation there are many other factors like eating unhealthy processed foods, high LDL cholesterol, depression, traumatic brain injury, diabetes, smoking, high blood pressure etc., that can cause dementia. One of the best ways to prevent cognitive decline is said to be physical exercise. It reduces chronic inflammation, improves blood flow as well as releases proteins necessary for brain health. However, a new study shows physical activity is not the cure-all answer for decline in cognitive health. The surprising thing was the link between how much time older adults spend sitting and their risk of getting Alzheimer's disease. What's even more interesting is that this risk seems to be higher even for people who make sure to get their daily exercise. The study found that those who sat for longer periods were more likely to experience a decline in their thinking skills and even showed signs of their brains shrinking over time, regardless of their exercise habits. More Sedentary Time Means Faster Brain Decline The study published in the Alzheimer’s & Dementia journal 2025, followed a group of adults aged 50 and older for an average of seven years. They used special watches to track exactly how much each person moved around during the day and how much time they spent being still. Over this period, they found a clear pattern: the more hours someone spent sitting down regularly, the worse their performance was on tests that measured their memory and how quickly they could process new information. This suggests that prolonged sitting has a negative impact on brain health over time. Daily Exercise May Not Help Your Brain As Much One of the key findings of this study is that simply exercising once a day might not be enough to completely protect your brain if you spend the rest of your time sitting. The lead researcher emphasized that while exercise is definitely good for overall health, minimizing the total time you spend sitting down each day could be even more important for reducing your chances of developing Alzheimer's disease later in life. This highlights the need to think about our activity levels throughout the entire day, not just during planned workouts. The results of the study were quite revealing. They showed that even a large majority of the participants – about 87% – were meeting the recommended weekly amounts of physical activity set by health authorities. Despite getting enough exercise, these individuals still faced a higher risk of brain shrinkage and cognitive decline if they also spent a lot of time sitting down. This strongly suggests that being sedentary is an independent risk factor for Alzheimer's disease, meaning it can be harmful to the brain even if you are otherwise physically active. You Need Less Sitting Time For Brain Health Researchers emphasized the importance of breaking up long periods of sitting with movement. She stated that taking regular breaks to stand up and walk around throughout the day is likely a promising way to help prevent the kind of brain degeneration that can lead to cognitive decline and eventually Alzheimer's disease. This suggests that incorporating more short bursts of activity into our daily routines, rather than just focusing on a single workout, could be very beneficial for long-term brain health.