Most everyone knows that Alzheimer’s disease means memory loss. But dementia, which affects nearly 50 million people worldwide, is about more than losing your keys or forgetting your children’s names. People living with Alzheimer’s (the most common type of dementia) and related conditions, such as frontotemporal dementia and Lewy body dementia, can suffer symptoms like disorientation, light sensitivity, hallucinations and sudden changes in food preferences.