Accumulation of tau protein is associated with progression of Alzheimer's disease, as it leads to neuron death. While spreading of tau is not immediately harmful, it does disrupt cellular processes over time.

Reduced food intake has been shown to elongate life and improve health in mice, but calorie restriction doesn't show as many health benefits if started in older age, especially in terms of fat loss.

Dog ownership was linked to longer life and better outcomes for heart attack and stroke survivors. The benefits may be due to the increase in physical activity or a decrease in loneliness or depression.

The GENUS technique studies how light and sound strengthen the brain's gamma rhythm and improve memory. Mice exposed to flickering light at a certain frequency had less buildup of amyloid and tau proteins.