Neuroscientists Find Beige Fat “Indispensable” in Protecting Brain from Dementia (scitechdaily.com)

"In adults, brown fat is primarily located between the shoulder blades and in the upper chest. Evidence suggests we can increase brown and beige fat cells by exposing ourselves to cooler to cold temperatures for several hours daily and through intense exercise. These approaches also can prompt the beiging of white fat. Most of us probably have some combination of fat cell types: mostly white, less beige and even less brown, she says."

Does anyone have more info on this? How cold do you have to go and for how long?