Here’s another reason to check your vitamin D levels. A new study has found that people with higher levels of Vitamin D in midlife have fewer toxic tangles of tau protein in their brain, a factor linked to Alzheimer’s disease.

Long-term exposure to air pollution may significantly increase the risk of Alzheimer’s disease, according to a major new study analyzing nearly 28 million older Americans.

Novo Nordisk (NOVOb.CO) said on Monday that an older oral version of its semaglutide drug failed to meet its primary endpoint in late-stage trials evaluating whether the medicine could slow cognitive decline in patients with early-stage Alzheimer’s disease, sending the company’s shares down 10%.

The United States on Friday approved the first blood test for Alzheimer's, a move that could help patients begin treatment earlier with newly approved drugs that slow the progression of the devastating neurological disease.