The effects of depression may infiltrate your very bones – and conversely, your bones may send penetrating messages all the way back to your brain. This two-way street is a captivating new field of research that could be crucial in improving patient care, especially for older adults, argue three neurologists in China. In a new review, the authors detail the under-appreciated " bone–brain axis " theory and how this concept can help us better understand and treat a ' silent killer ' like