A series of new experiments on mice have revealed a key process by which the brain and immune system communicate to burn deep stores of visceral fat. It's the first time scientists have identified a neuro-immune pathway directly linked to fat control, and while the findings are limited to mice, the authors are hopeful the system extends to other mammals, like humans, too. Visceral or 'deep' fat is the yellow matter that envelops the abdominal organs. Like most forms of fat, its presence is crucial to maintain a body's fundamental functions, but if it builds up too much, it can...