What factor might contribute to memory decay in older adults?

Lack of exercise is a significant factor that can contribute to memory decay in older adults. Physical exercise is known to enhance cognitive function and overall brain health. Regular physical activity promotes better blood circulation, which is crucial for delivering oxygen and nutrients to the brain. It can also help reduce the risk of conditions such as hypertension or diabetes, both of which can negatively impact memory and cognitive abilities.

Furthermore, exercise is linked to the release of various neurotrophic factors, like Brain-Derived Neurotrophic Factor (BDNF), which supports neuron growth and maintenance, thereby improving memory retention and overall cognitive performance. In contrast, options such as increased social interactions, a diet rich in omega-3s, and consistent cognitive engagement are typically associated with positive effects on cognition and memory, rather than contributing factors to memory decline.