It controls "thought, memory, emotion, touch, motor skills, vision, breathing, temperature, hunger and every process that regulates our body," according to Johns Hopkins Medicine.
"You can change this by coming up with a set sleeping schedule (at least six to seven hours) and sticking to it."
"[R]esearchers found that people over 65 who consistently slept more than nine hours every night had twice the risk of developing dementia ," writes Boston University's The Brink.
Physical activity improves cognition, reduces anxiety, depression, and dementia risk, according to the CDC.
Water regulates body temperature, prevents infections, maintains organ function, and boosts mood.
"By surrounding yourself with family and friends, you build emotional connections which lead to longevity," explains Aggarwal.
"Anxiety and depression have been linked to a higher risk of memory loss," says Aggarwal.
Healthy eating improves heart health, prevents disease, and maintains weight.
He also recommends limiting TV time.That's passive and doesn't engage your brain."