i have asd and i live in a place that gets very cold in the winters so i may be biased from a sensory perspective, but i've never understood the obsession some people have with sweat. i find it very unenjoyable and would much rather work out in a cold environment where the metabolism and exercise keeps you warm than in a warm environment where your body has to force evaporate a bunch of extremely annoying water off of your skin just to maintain normal temperature. great video!

This entire channel is underrated.

Great video! I'm one of those thermo guys that wants to add some info to how sweat cools us. The process is called evaporative cooling, which is the same general process happening in a subset of air conditioners called evaporative coolers. As some have pointed out, these aren't what's in your central air conditioning system. Thanks for clarifying that below. When you sweat, you move some water (and other stuff) to the surface of your skin. That water needs to go somewhere. Some of it falls off, some of it you will wipe off, but a substantial amount evaporates. When water evaporates, it takes energy to induce the phase change from liquid to vapor. That is, it absorbs some of the energy (i.e., heat) from the surrounding environment to vaporize it - the amount of energy needed is called the "heat of vaporization." The environment here, is your skin and the surrounding air. So, the sweat is pulling in some heat from your skin, thus creating a natural cooling effect. This is also the reason that humid environments are so dangerous. When it is humid, there is more water in the air. When there's more water in the air, it is harder for more water to be added. This means your sweat remains on your skin, and the cooling effect is diminished (or even nonexistent in the worst case). But the effect is even worse, because now that the sweat is on your skin, it starts to act like an insulator, i.e., it's keeping you warmer. That is really bad news. If the humidity is 100%, that means no more water can be added to the air (the temperature at 100% relative humidity is called the "wet-bulb temperature", which you can think of as the opposite of the dew point). At 100% relative humidity and 95 F (35 C), humans are likely to die in 6 hours just sitting around. Thankfully, this is an exceedingly rare environment to find yourself in unless you're looking for it. Understand that you are sweating at some rate most of the time, but most of it evaporates quickly, thus cooling you off and making room for more sweat. When you have sweat standing around on your skin, it means that you are sweating faster than it's evaporating, and the excess ought to be wiped off. Otherwise, that standing sweat starts to act as an insulator. This is why moisture wicking shirts are so important when you're gonna be doing a lot of activity - they pull excess sweat off your skin, allowing your sweat rate to match the evaporation rate, and keep you cool.

With Casual Geographic and now you, the ultimate team of young, passionate, informed people teaching others about how things really work is being formed... Maybe we can add Not Just Bikes to fill the essential urban development slot.

I've known for years the only reason we sweat is to cool off. Learned that back in middle school in the 90s, in high school weight training class, and again in college. I worked in a highly physical job in a very hot warehouse... and my thermoregulation was terrible. I barely sweat. I lost weight on the job, but while everyone else there, male and female alike, had huge sweat trails on their shirt and seemed overall cool, I was constantly flushed, dabbing my forehead with a wet paper towel and sticking my face in the fan trying to cool off. Yeah, I've always known we sweat to cool off, but apparently I suck at doing it. (That said, I've never liked the way sweat/sweating feels so... 🤷)

Aside from certain mesical conditions, water weight should only be a concern to bodybuilders right before "peak" (unhealthy) competition conditions, in which being incredibly dehydrated makes the veins pop out more and the muscle striations more prominent.

Very good info. I was hoping you brought it on home and talked about why sweat is typically associated with weight loss. And that’s because breathing (in particular, exhaling CO2 + H20) is where the weight goes when you “lose“ weight. Well what causes you to breathe or exhale *more*? Doing exercise. And typically exercise that makes you breathe harder/faster causes you to generate more body heat and….sweat. Great video as always. Big things coming!

Thank you for the easy-to-follow explanation... as a former middle school teacher (12 years) and now second grade teacher (20 years) the analogy of the class clowns/circus made me LOL 🤣 Also your nephew is adorbs!

Uncle Johnny, best uncle ever

Great High Quality easy-to-understand content as always!

We sweat via eccrine sweat glands in the skin, these can also absorb external fluids, so are correctly called pores. Our skin is waterproof, but the pores allow sweat to leave when body is pressed/active/heated, and pores allow external water (or vapors) to enter the body when immersed.

This is a god tier KZfaq channel each video is well edited, informing, important, funny, and just hella good

Hahaha 😂This was so good. The little nephew, cute- Thanks for the information once again… Love this video!

Super explanation. Because we lose Vital Electrolytes when we sweat it is better to conserve sweat when we don't have water to drink to replace that lost. Burning calories produces heat which results in Perspiration visible and invisible.

If I would have had a teacher like you in high school, I'd have multiple degrees. If you've ever considered teaching part time at your local community college, please do. I'm in my 60's by the way, so I supposedly went to school when we had a functioning public school system. - which was _partially_ true. The few truly good teachers I had were hampered by the rote learning that was conmon in those days. All that does is teach you how to learn a bunch of largely useless semi-facts and then immediately forget them so you can memorize a bunch of stuff for the next test.

New sub since yesterday. Keep up the awesome content

Investigate what happens with respect to energy transfer when a phase change is involved (occurs). When water goes from solid (ice) to liquid (melted ice aka water) or liquid to a gas (steam in the case of water) it transfers much more energy. It's why sweating when the air is drier (think Arizona) versus humid (think Florida) means it doesn't feel as hot at 110F in Arizona as it does at 90 in Florida (sweat goes through the phase change from liquid to gas at your skin removing energy (heat energy). One needs to keep in mind that the phase change in the other direction (gas to liquid or liquid to solid) that the energy transfers in the opposite direction (think a burn from hot water versus a burn from steam) or, as I discovered in my 20's, what happens when a drop of molten metal lands on your skin and solidifies. Trust me, that's worse than being touched by a branding iron because of the phase change (I worked in a zinc melting plant with liquid zinc (787F), lead (327F), aluminium (1218F) and iron (2700F). And those are just the point at which they melted, but were kept much hotter, as they still had to flow to get to a mold. It was always those pesky little gnat sized droplets that found a patch of unprotected skin that hurt like hell! Oh yeah, sweat... Works good! 😏

Your content is 10/10 man, keep it up!

JD!!!! Always coming through with genuine content!

You're educational and not boring👍

I appreciate how you went into detail on not just what sweat actually does but actually how it is often incorrectly associated

Brother, you have the video quality of a very large KZfaq Channel. I hope you get what you want out of this channel. You provide great information and entertainment. My God bless you! Thank you for all your content.

This channel does not get enough attention. Keep up the good work my guy.

I would say excess water weight can exist, but it's merely a symptom of a larger problem. For example, if you have pretty bad insulin resistance (like in a type 2 diabetic) you'll have high insulin levels which directly influence the kidney's in how much water they keep around. Forcing yourself to sweat it out isn't going to magically fix the larger metabolic problem at hand, so your kidneys will just fight to keep that water around and you'll end up back at that high water weight.

tl;dr: sweating doesn't cool you off, water absorbs heat, then evaporates off the skin pulling that heat with it. what you didn't say here: if the humidity is too high, then the water can't evaporate anymore and keeps the heat on your skin.

I’ve always looked at sweat as a good indicator that my body is warmed up and ready to work out. I’ve always made sure that I’m sweating, and have done a few dynamic stretches to decrease the risk of injury at the gym.

Glad I get to watch this video to kick off my weekend!

Sweating is good. Thanks for this information. ❤

Mostly unrelated, but i love that when someone mentions the mitochondria, they have to follow it up with "the powerhouse of the cell"

i love your videos! you are my inspiration :D

Great video my man

Informative and playful. I enjoyed. 😊

Great video! There was a video I had watched about the formula for fat and how when the body uses it, it breaks down to the energy given off, carbon monoxide and water. Dovetails nicely with this videos content.

I'm a sweaty guy and I live in a hot climate, so I really hate feeling sweaty because I feel sweaty all the time and it's gross and uncomfortable.

I view sweating as a single that my body is warmed up. This means that it's safer to to do certain movements.

When I was young, I knew that we needed the sweat to evaporate. In elementary, I was asked the question if sweat evaporating or sweat in general is useful (I can’t remember exactly which one), and only I and one other person got it right. The animation showed one person staying at a near constant temperature while the other person was boiling. On another note, what humans perceive as temperature is actually the rate of energy exchange to another body. Two objects could have the same temperature but different internal energies due to different specific heats, so one could _feel_ hotter than the other.

Thank you

Perspiration is basic refrigeration. Cooling through evaporation.

Just want to say that bringing in your next generation on this is a classy move. If your brother is good with this, I envy how healthy your family dynamic must look like.

Endothermic reaction of vaperisation.

For me, "water weight" always meant: weight you have because you're dehydrated/ weight you'll lose by hydrating

Great video! I like the shorter format. I skip the long ones.

It's also important to point that that putting muscles to work produces heat. That heat has to be dispelled, that is done with sweat. So no matter what, if you are burning calories at a high rate, you will be producing a lot of heat, and that will produce sweat. Sweat is evidence of calorie burning but it is not itself the cause of it.

Thanks!

i love these videos:3

Earlyy love your videos

From a basic evolutionary scale, the advantage we have with the function of sweating has to do with survival. We weren’t the fastest, but we had the advantage of endurance that came with the ability of evaporative cooling, what it takes to pursue game that is eluding the pursuit of human hunters. Eventually prey animals will become exhausted from overheating and overexertion running from primitive Homo sapiens, and they would fall victim to their pursuers who could literally run all day with the evolutionary advantage of evaporative cooling via sweat glands. We did not evolve with superior strength or speed, but we made up for those deficits with superior intelligence and endurance, which eventually evolved into further advantages including language, shelter, camouflage, intelligently designed weapons, etc.

Evaporative cooling and perspiration go hand in hand. I think that is more the point of sweating. Your video kind of danced around that aspect. Hey, no sweat! . . Okay, I must confess. I just wanted to be able to create a narrative where I could be clichè. :0)

Please do a super deep dive on twisting your knees and the rotation limit of human knee.

The mitochondria is the powerhouse of the cell!

Even though I did already know the purpose to sweating, I still learned some neat stuff about muscles.

“i’m sweating right now” BRUHHHHH

Ok, scribed!!! Thank you for being pbs and bill Nye levels of educational all while smashing the b.s. I definitely take your arguments to other aspects of social life... This video could be morphed into talks about how drama and resolution can be conducted.

9:23 That means you've played too much tears of the kingdom

LUNGS! Talk about the lungs! and proper breathing maybe? (nasal, diaphragmatic) Breath by James Nestor was such an interesting book to me. I really want to understand the correlation between weight loss and breath too.... and why the hell asthma is a thing. It's brutal :(

As we know from school physics, water needs energy to become stream. It's not enough to just get it to 100 deg C. So, to evaporate from your body it needs the same energy, and water takes this energy from surroundings cooling you in the process. Thats why you feel cold when you are out of shower. And it also explains why bottle of beer fixed to car top in wet cloth gets really cold after a ride. It's much more effective, then just taking the hottest thing out of your body.

Like the videos and would like to see them get to bottom line up front. Almost tldnw. Great information is like to get to faster👍

Love the way you explain. "I'ma gonna getchup outa yo way." Is that what you always end with?

I live in georgia and if i walk to the mailbox and back im sweating like i ran half a marathon. I dont see it as a symbol of my hard work i see it as a hindarance to my work. I hate being sticky or tacky and wet.

Sweating was a good temporary solution to make weight before a wrestling match. I didn’t have any fancy apparel, just a garbage bag.

The one useful application I've heard for "water weight" is actually for things like wrestling, where the sport is divided into separate weight classes. If you're weight class cuts of at 180lb, and you're at 182 the day before weigh-in, making yourself sweat a lot can be a quick way of losing that weight to stay in the lower weight class. A professor of mine told a story of how they used to go out on the beach at night and sleep in trash bags to make themselves sweat out the water weight before the weigh-in. That said, I saw these sweat vests in Walmart for the first time about a month ago, and I was like, "That sounds like the stupidest thing ever. There's no way that actually does anything, right?" Glad to know I was right 🤣

if you get wet then stand in front of a stream of moving air, like a fan the cooling effect becomes very obvious

I... literally cannot imagine not knowing how sweat works and thinking that sweaty clothes equate to exercise. If you get wet on a hot day, it feels cold and goes away. People aren't putting that together? Latent heat of vaporization? Not common knowledge? Am I the only one with a Windex spray bottle in my convertible for my face in the summer?

Johnny is just so damned cute. He could make anything seem interesting

I would give anything to have trouble sweating and feel like I had to buy something to help. It’s honestly embarrassing when I workout I look like I’m melting.

You should probably use the term “Thermal Energy” or “Internal Energy” instead of “Kinetic Energy.” I’m not a thermologist haha, but you had be squirming a bit when you started talking about kinetic energy. I am just about finished my mechanical engineering bachelors. I wanted to clarify a few points for you and the viewers real quick :) Kinetic Energy generally refers to the energy matter has because of “bulk” motion of that matter. Bulk refers stuff at a macro-scale. In contrast, a micro-scale or molecular-scale would refer to what the molecules that make up the matter are doing. For example, consider a bottle with water in it that is not moving from the point of view of our naked eye. That water bottle a would have a kinetic energy of 0J*. The movement of the bottle, and the water in it, is the “bulk” motion I mentioned earlier. However, the water bottle still has a temperature and the molecules inside it are moving around (on a molecular-level) as discussed in this video! That molecular movement is better referred to as Thermal Energy or Internal Energy. (Although these terms are still not as straightforward as I wish they were. Thermal energy can refer to other things and Internal Energy is not solely molecular movement energy since it includes other potentials like magnetism!) I also have a clarification that has to do with how you used “Heat” 😛. Let me know if you/anyone wants me to explain that too! *Technically this is the relative Kinetic Energy (not absolute) since we are on a planet that is moving. The water bottle would strictly speaking have a Kinetic Energy equal to what we and the earth have which isn’t zero I don’t pay tons of money for bad teaching at my university only to teach myself the material later for nothing lol. Successfully nerded 👍

Losing water weight and losing weight has definitely been conflated, but for me losing water weight was important as a wrestler for putting on as much muscle, but losing water weight to meet the required weight at weigh in. But I always knew that weight loss of temporary because after the weigh in, I would just drink all the water I wanted and be fine after depriving myself of water for a short bit of time.

Sweating, in and of itself will of course lose only water weight, which you must restore or be dehydrated and become ill. How you get to the sweat matters. Exercises that burn more calories, ie weight lifting, walking, running, jumping, etc., than we consume are the things that will or at least may burn fat, depending on how much glucose is available to burn. If you always make sure there is enough glucose to cover all energy needs fat will NEVER burn. At some point you must cause a glucose deficiency to burn fat. Remember, high blood glucose is dangerous! Too much blood glucose for too long, even a few hours will cause damage to blood vessels, most notably capillaries, like in the eyes, so the body will do EVERYTHING it can to burn off, use, or store that glucose as fast as it can, even risking long term damage to organs and overall health to prevent immediate harm. To burn fat you must make your body feel safe by letting your blood glucose levels drop to and stay at safe levels for a period of time. And please, stop blaming insulin. Insulin is just doing it's job, distributing amino acids and glucose, like it is supposed to do. Don't eat junk and insulin is not a problem. Eat well, work out and live long! Peace!

There are people who didn't know it was about temperature regulation? This is smth I was taught in school, in books I read, AND in shows I watched, all as a kid lol.

Wait what's that poster behind you? That looks dope as shit. It took me a bit because they all looked vaguely familiar but that's a bunch of old black cartoon icons. Vince from Recess, Gerald from Hey Arnold, Static Shock, Cyborg, Never watched Danny Phantom but that dude, and I think AJ from the fairly odd parents? AJ or the kid from Kim Possible. I gotta know where you got that, that's fucking fire

Sweating more helps you lose water weight. When doing weight in for MMA and 20+ years of doing military weight ins I used this numerous times to make weight. Could lose up to 7lbs within a day (ps severe dehydration is very dangerous) Would always immediately gain back the weight after (within a day of eating drinking normal)

Long answer: 'no', with a 'but...', Short answer: 'Yes', with an 'if'...

I actually knew all of this somehow. Kind of dissapointed it didn't go deeper.

Personally sweating feels excessively uncomfortable to me, so I'd rather there was a product that made me feel dry throughout exercise. Any worn fabric is going to get moist and sticky though, and blocking pores is unhealthy, so I guess there's no such a product.

bro, i live in florida. sweat is simply what happens. if you’re not in AC you’re gonna sweat regardless it’s just the way of life

before watching the video sweat to me means cooling the body, exercising generates a lot of waste heat that needs to be managed sweating also sheds fluid and minerals, and those need to be replenished when sweating a lot

No Lab Coat Required. can you do a video on a truth against coffee and all caffeine including chocolate? think it would give many of insight and awareness with the truth towards caffeine drinks and chocolate.

I don't like to sweat per se, but when I vacation up north I do like the occasional sauna because it's almost as if going too long without a 'good sweat' feels wrong. I don't know if that's because I'm from the south and sweating is a day to day thing or if it has something to do with the other things that are in sweat beyond water. Or both

Only about 1 minute into the video so far, but my thought is that if sweat had anything at all to do with health and fitness, then everyone with chronic night sweats would be absolutely godlike in physique. I'm pretty sure that's not the case. Sweating usually just means dehydration and salt loss.

Question: What is that picture of on the wall behind you with the half dozen people that looks like it comes from a comic book? What group is it. Google image search has failed me since it shows up too blurry in the video. Thanks.

Question: What about people with medical conditions that cause them to gain water weight? My MIL (now gone) had severe Rheumatoid arthritis and type 1 diabetes. She could barely move, but move she did. at the end of her life, she was HUGE, and I suspect a lot of it was water weight, as she could not get rid of excess water fast enough. A few years before she passed, she was carrying about 30 lbs of water weight, probably double that at the end of her life... How does this gaining of water weight happen to someone with functioning kidneys?

hasn't studied dry fasting. in the surch for water the boady brakes down fat . as to why people loose more weight faster on dry fasts

QUESTION. Can you cook with your body heat?

Sometimes in high-level sports categorized by body weight, it is necessary to sweat to lose weight. Then after the officials check the competitor's weight, they rehydrate and eat. Unfortunately, ordinary people mix the notion of body weight with fat weight, which are not the same.

Was at the state fair one year and going through the Varied Industry building. A woman selling saunas told I and my friend that a drop of sweat = one calorie. I have no idea where she got that idea. This is the first time I've heard of "pro sweat" products. How gullible does someone have to be to buy something like that?

Have you looked into how the body would compensate for water loss from sweat when you're not putting water back in? I know that when body fat is used for fuel, a by-product of energy production is h2o molecules left over from the fat cell molecules. Could this play into fat loss with sweating over time? (And I'm not talking about not drinking any water at all...just not as much as you sweat possibly?)

I could walk 3 feet and start sweating so Ive never seen it as how hard im working

I know what the sign of extra fat burn is -- heavy breathing. When fat is metabolized, it turns into carbon dioxide which means lots more breathing to get it out.

So, how does fat get eliminated from from body? Working in gout doesn’t melt fat at all?

People think that perspiration is anything other than the body's attempt at cooling itself from the heat generated by muscular activity or general cooling mechanism for hot weather? I mean I guess it has a few skin oils and maybe a few pheromonal chemicals in it like other animal secretions.

On prime day I just bought a sauna suit 😌

so, we sweat to cool off to maintain an optimal body temperature which I imagine is important for our body to function, and that cooling effect is due to evaporation of the sweat and none of that has anything to do with burning calories and stuff, so by using one of those vests that "make you sweat" more, it all just sounds to me like you're sabotaging your cooling system to make your workout more difficult than it needs to be for no reason

For the algorithm

Never mind but the like hand is missing!

personally i always percieved sweat as my body trying to cool itself down

The only reason athletes used sweat gear in the past was because they would fast and dehydrate themselves before a weigh-in; sometimes to the point of exhaustion and critical dehydration.

5:16 Thats not whats happening. We cool down from the evaporation of sweat "water" It doesn't change the temperature of a boiling pot when you take a cup of water out. It doesn't change the temperature of water in a boat thats sinking when you start pulling buckets of water out. We dont change temperature just from the sweat exiting our body. Thats why high humidity is dangerous. When the air is already saturated with water the sweat does not evaporate and does not cool us anymore. It doesn't matter how much you sweat in a 100% humidity environment, its not cooling you down without evaporation.

Living in FL I'm VERY familiar with sweating. If sweating was a weight-loss program. Not a single mofo down here would b fat.

Wouldn't you want to lower your core temperature to increase calorie burn because your body needs to use energy to increase or maintain your temperature? I mean, it's probably still negligible.

I have hyperhidrosis and all sweating has ever done for me is dehydrate me.