Although sweat itself is fairly odorless when skin is clean, once the bacteria that live on skin mixes with sweat, they multiply and begin to leave an unpleasant odor. The sweatiest areas are usually the smelliest, including the armpits, back, chest, feet and between the legs. That’s because these areas tend to have more sweat-producing follicles and are also dark, warm, moist environments that nurture bacteria. Human body odors change throughout the life cycle, as does someone’s ability to detoxify through their pores. So, unless you are part of the fortunate 2 percent of people who carry an unusual form of a specific gene that means their underarms never smell, you need the help of natural remedies to keep odour at bay.