system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does sweat smell distinctively different in different areas of the body?
gpt
There are two distinct types of sweat glands found in humans: the eccrine and apocrine sweat glands. While eccrine sweat glands cover every area of your body, apocrine sweat glands only appear in axillary (armpit), external genital, perianal and areolar (nipple) areas. While secretions of both glands are initially odorless. The content of apocrine sweat glands' secretion includes proteins and lipids along with water and minerals while the secretion of eccrine glands only contain water and minerals. Bacterial breakdown of the apocrine glands' secretions is what causes the odor, not the secretion itself. As there is nothing to break down, the secretion of the eccrine sweat gland remains odorless.