One-third of the world's dementia cases can be prevented by managing lifestyle factors such as hearing loss, smoking, hypertension and depression, reveals a new study reported by the first Lancet Commission on Dementia Prevention and Care. The beneficial effects of nonpharmacologic interventions such as social contact and exercise for people with dementia have been highlighted in the reoprt. The study was presented at the Alzheimer's Association International Conference (AAIC) 2017 and published in The Lancet.