Caring for your brain shouldn’t be left solely to scientists or doctors. Every day, without noticing, we engage in habits that can either support our cognitive health or gradually damage it. Experts warn that there are four major silent threats affecting millions of people, often without their awareness — and most of us live with them daily.

A recent book sheds light on these seemingly harmless routines that speed up cognitive aging, lower focus, and heighten the risk of conditions like Alzheimer’s. Fortunately, it also offers practical steps to reverse the harm and strengthen your brain starting now.

1. Sedentary lifestyle: the quiet neural disruptor

Long hours of sitting reduce oxygen flow and weaken communication between neurons. Inactivity shrinks memory-supporting chemicals and triggers inflammation. Even short breaks—walking, stretching, standing—can help activate the brain’s repair mechanisms.

2. Sugar and refined carbs: the deceptively sweet threat

These foods are so common that many forget how harmful they are. Frequent sugar spikes disrupt hormones, cloud thinking, impair memory, and accelerate brain aging. Cutting back and choosing whole foods is a simple protective step.