5 simple daily habits to keep your brain sharp after 40

It is well known that as we age, our brain naturally undergoes changes. This in turn can affect our memory, focus, and cognitive speed. However, some research and studies shows that small, consistent daily habits can have a huge impact on our brain health and improve it too-- thus delaying cognitive decline. As one turns 40, it becomes even more important to nourish your mind through good lifestyle choices that supports your mental health and prevents memory loss over time. Here we list some such simple yet powerful daily habits to keep your brain sharp after 40:

Regular exercise has many benefits, and one of them is that it boosts blood flow to the brain, thus promoting the growth of new neurons. Even 30 minutes of brisk walking daily can improve one's mood and memory, and slow cognitive ageing. Exercise also releases brain-protective proteins like Brain-Derived Neurotrophic Factor (BDNF), which helps learning and memory. A 2022 review article highlights how regular aerobic exercise increases the volume of brain structures linked to memory and learning, such as the hippocampus, partially through increased secretion of neurotrophic factors, including BDNF. It also discusses how exercise boosts cerebral blood flow, which is important for brain oxygenation and function.

Certain nutrients like omega-3s, antioxidants, and vitamins play an important role in brain health, and so they should be included in one's daily diet to boost memory and brain functioning. A 2021 study titled 'Associations of Omega-3 fatty acids with brain morphology and volume in cognitively healthy older adults' in Ageing Research Reviews showed the link between higher omega-3 levels and greater brain volume, particularly in the hippocampus and grey matter, which are important for memory and overall brain health.
So include foods like fatty fish, walnuts, blueberries, and leafy greens to reduce inflammation and oxidative stress, which cause cognitive decline.

Keeping your brain active helps maintain its plasticity. So, practise solving puzzles, reading, or learning a new skill to strengthen neural connections and sharpen the brain over time. Even short bursts of mental effort stimulate areas involved in memory and problem-solving. A 2013 study in Psychological Science found that adults who learned new skills, like photography or quilting, improved long-term memory and cognitive function.

It is often said that one should aim to get good quality sleep of 7-8 hours daily, and rightly so as it plays an important role in one's overall health and well-being. When one gets good quality sleep, it helps in consolidating memories and clearing toxins from the brain. On the contrary, poor sleep over time has been linked to a higher risk of Alzheimer’s disease and impaired decision-making.
A 2020 article titled 'Memory and Sleep' in PubMed Central shows the physiology of memory consolidation during sleep, emphasising the role of non-REM sleep in reactivating memories in the hippocampus, and how sleep strengthens memory retention.

Meaningful social interactions help in reducing stress and promoting emotional well-being, thus protecting the brain from cognitive decline. So, engage with good friends, positive family members and community groups as it stimulates the brain regions that are responsible for emotional and cognitive processing.
A 2024 study titled "Association between social isolation and incident dementia' found that people with moderate social isolation were 22% less likely to have dementia compared to those with high social isolation, although the association was influenced by other factors such as depression, anxiety, and other health indicators.