As many as about 40 percent of all dementia cases can be prevented or delayed by prevention, according to a comprehensive update from a previous report from 2017 by The Lancet Committee on Dementia Prevention, Intervention and Care (Gill Livingston et al.).
These are the measures the committee is thinking of: aim for a systolic blood pressure of 130 mm Hg or less from about 40 years of age. Encourage the use of hearing aids for hearing loss and reduce hearing loss by protecting ears from high sound levels. Reduce exposure to air pollution and tobacco smoke. Stop smoking. Provide all children with primary and secondary education. Live an active life in the middle and possibly later in life. Avoid obesity and diabetes, prevent head injuries, and drink less than 21 units of alcohol per week.
The authors note that a direct causal link between these ‘modifiable’ risk factors and dementia is, strictly speaking, an assumption, but the indications are strong.