Unusual Ways Technology Affects You & The Strange Science of Sweat

Cooling Mechanisms

Sweating is a unique and efficient cooling mechanism for humans. Sarah Everts explains that while other animals rely on methods like panting or even urinating on themselves, humans have millions of sweat glands that help regulate body temperature by evaporating sweat from the skin's surface 1. This ability to cool down while in motion has given humans an evolutionary advantage, allowing activities like running marathons or hunting in hot climates 2.

The fact that we can cool off while in motion is something that we can do better than most other animals on this planet.

--- Sarah Everts

Genetics and early childhood environment also play roles in how efficiently individuals sweat, with those growing up in hotter climates often having more effective sweating mechanisms 1.

   

Types of Sweat

Humans have two types of sweat glands: eccrine and apocrine. Sarah Everts describes eccrine glands as responsible for cooling the body with watery sweat, while apocrine glands produce a waxy sweat that bacteria metabolize into body odor 3. This distinction explains why nervous sweat smells different from sweat produced during physical activity.

You're stinky because bacteria living in your armpits are eating your sweat and turning it into sticky stuff.

--- Sarah Everts

Interestingly, sweat is derived from the liquid parts of blood, emphasizing the importance of hydration but also cautioning against overhydration 4.

   

Sweat and Attraction

Sweat plays a surprising role in human attraction. Sarah Everts explains that humans have a unique odor print, which can convey social information like stress levels and even immune system compatibility 5. This odor print can influence romantic attraction, as people are often subconsciously drawn to those with different immune systems, enhancing offspring survival.

Researchers have found that we are attracted to those of others who have immune systems that are slightly different enough that any progeny that we have will have a really robust immune system.

--- Sarah Everts

The concept of pheromones in humans is still debated, but the idea that body odor can impact romantic relationships is well-supported 6.

   

Marketing Body Odor

The marketing of deodorants and antiperspirants has significantly shaped societal attitudes towards body odor. Sarah Everts recounts how early 20th-century marketers used fear tactics to convince people they needed these products to avoid social ostracism 7. This led to a booming industry that continues to influence our perceptions of sweating and body odor.

The strategy is called whisper copy, by the way, and that not only are people gossiping about them, but this ultimately is going to mean they're not going to find themselves a husband.

--- Sarah Everts

Modern products work by either killing odor-causing bacteria or physically blocking sweat glands, highlighting the lengths to which society goes to manage this natural process 8.