smells associated with sour and acidic substances such as vinegar, fermenting milk or vegetables, wine or lemon. Can be pungent and sharp as Formic acid and Capric acid in goats’ milk, vinegary as acetic and propionic acid, or sourish and cheesy as isovaleric acid responsible for "locker room" odor, "dirty socks" smell and stinky feet. Some acidic breath or body odors are associated with yeast infections, cystic fibrosis and cancers, but it could also be a side effect of diet, medications and microbial imbalance (skin and gut flora)