Bring Up Taste—What taste buds are doing
We probably all love birthday celebrations, but I personally enjoy the moment when I get to dig my teeth into the cake. My birthday cake this year was exceptionally good and was made by my mother-in-law. Made from almond powder, chocolate and instant espresso powder, I would say that this confection was a perfect balance of sweetness and bitterness. Even though the pandemic and its government-based safety measures are still prohibiting us from celebrating birthdays in full and due form, I was greatly satisfied with this birthday. Lots of friends and family members sent me their wishes through social media and SMS. I received absolutely great gifts, and I was surrounded by people I so dearly love. Nonetheless, at the risk of sounding like a broken record, the cherry on top of everything was the cake. I know! I know! I keep mentioning the cake, but maybe you’ve come to realize now that I am a glutton. I love food. I must say that the flavours have probably a lot to do with it. I just can’t seem to get enough.
There are surely many things we must all learn about taste and flavour. Let’s start with the distinction between the two since many of us tend to use them interchangeably. Taste refers to the sense, which can also be called gustation. Flavour refers to the whole experience produced through taste, sight and smell. So taste might be in part flavour, but that still does not make flavour the same as taste. We can say that taste is simpler than flavour as it involves only one instead of three senses. Thus, we can start by mentioning a thing or two about taste.
I don’t know about you, but when I think about taste, the first images that come to my mind are taste samples. Yet, there probably should be another image up there in my mind. What would you say? A mouth? A tongue? A throat? Maybe that last one seems a bit too far-fetched, but sure, throat is part of taste too. Still, now we are probably getting a little ahead of ourselves. Why don’t we start with the tongue? It looks like a nice place to start with all those taste buds, right? Those taste buds, contrary to many people’s beliefs, do not form the small bumps found on our tongue. Not only is this belief incorrect, but it’s also misleading. Those small bumps are actually known as papillae. Although it is correct that we can find taste buds in those papillae, not all papillae contain them. As a matter of fact, the entire middle section of the tongue has not one single taste bud, and yet it holds a large number of papillae.
Taste buds are formed of taste cells which are each responsible for transmitting taste qualities. It would be nice if they were the small bumps or the papillae found on our tongue so that we could see them. Unfortunately, our taste buds are microscopic and thus cannot be seen through our naked eyes. There are, yet, so many of them. We can count an average of 5,000 taste buds on our tongue, but that’s not all. Taste buds can also be found on the inside of our mouth and throat, making the total estimated number much bigger than this, twice the amount to be exact. And in each taste bud, there are approximately 60 taste cells, which brings us to a grand total of 300,000 taste cells on the tongue and 600,000 in the entire mouth.
Fun Fact: Birds have fewer taste buds and lack the specific pain receptors responsible for feeling capsaicin (the active ingredient in hot peppers). However, squirrels do have the receptors. So, if you want to encourage your squirrels to steer clear of your bird feeders, you simply need to add chilli powders to the feed. The squirrels won’t know what hit them, and the birds won’t even notice anything had changed.
Taste buds are quite funny looking. To give you a better idea, imagine peeled oranges. The oranges would be the taste buds and its sections (the carpels), the taste cells. If we look at the top of taste buds, which points towards the inside of our mouths, we can find taste pores. They provide the saliva, which contains water-soluble substances, with access to the cells. Taste hair (gustatory hairs) located within the taste pores region will capture the substances coming in contact with them. Those substances are called tastants and, once caught, will trigger a cascade of events sending a signal to the brain’s thalamic region and then to the first and secondary cortex. This signal will be decoded, by the brain, to find out what substances we ingested.
Fun fact: Our taste cells have a tiny lifespan of approximately ten days, which may probably be for the best. Taste cells truly have a harsh environment to endure, considering all the burning and biting happening to them.
The cells are pretty unique in how they sense the environment. They all possess a specific palette of tastes with different sensitivity to each of them guided by varying concentration thresholds. So, thinking that some tongue regions are only capable of perceiving one taste is entirely wrong. The entire tongue can feel all taste, except for its centre, where it lacks taste buds. There are many taste qualities, and in the most recognized list, there are five: sweet, sour, salty, bitter and umami (savoury). That last one is the most recent addition and wasn’t always on that list. As such, we can suppose this list could change again, which it did many times in the past, starting with Aristotle’s list. This great philosopher and polymath theorized that the list had seven elements: sweet, sour, salty, bitter, pungent, harsh and astringent. Even though that list may change again, all scientists can agree on one thing: this list will always remain reasonably concise.
All taste qualities can be associated with one representative substance: sugar (sweet), table salt (salty), acids (sour), quinine (bitter) and glutamate (umami). Assuming taste has a survival purpose, we can suggest that each of the preceding taste qualities has a specific role and that is exactly what scientists have tried to determine. The hypothesis regarding sweet and salty is that it often indicates which foods are rich in energy and essential nutrients. As for sour and bitter, it may perhaps reveal that the food is spoiled or poisonous. For umami, things are a bit more obscure. Some claim that umami may help identify protein-rich food, but it still remains to be verified.
It’s all nice to know what the taste buds are capable of, but without the help of our smell, sight and touch, we wouldn’t even be able to tell if it’s a lemon we chewed on. We could only report that it’s sour. That doesn’t sound like much. Does it? To experience the full range of taste, we must be able to see, smell and touch. I can personally tell that bright green food doesn’t look appetizing to me at all. I am thinking here about the green apple flavoured sports drink by Gatorade. I tried it, and I particularly dislike it. It’s not really the sourness that seems to disturb me. It’s really the colour. As for smell, I can assure you that once I could detect the scent of my birthday cake cooking in the oven, I knew it would taste incredible. As for touch; texture, temperature, and pain definitely contribute to my enjoyment. For example, I find that room-temperature water tastes better than freezing cold.
You are now experts in the field of taste, but what if I told you that there is a fruit capable of tricking you into believing that sour is now sweet. Would you believe me? Yes? No? Well, believe me or not, there is such a fruit. Indeed, the miracle fruit contains a substance named after the fruit itself, miraculin, and once ingested, allows you to bite into a lemon and make it taste like the sweetest lemon pie. Besides, there is another plant capable of masking the taste of sweetness. That plant is called Gymnema Sylvestre. Once brewed and added to your sweetened tea, you won’t be able to taste that sweetness anymore. These taste modifiers are an exciting twist to what we learned about taste today. Isn’t it?
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No one can dismiss the amazing feeling we get after spending some time in nature. We instantly feel relaxed and reinvigorated. Some might attribute this effect to time spent far away from work, and even though they could be correct, it is not the whole picture. Biophilia is a relatively new concept that brought the public more awareness to the role nature plays. The term refers to our innate propensity to be in nature or to connect with it. Our love for nature is so strong that the mere presence of reminders can be sufficient to initiate a cascade of positive effects. All the reactions produced can lead to a lightened mood, better cognitive processes, including concentration and focus, and a sudden burst in motivation. Nature’s reminders, also called biophilic elements, can be either alive or inanimate, but living elements can instigate the most impressive outcomes. To embrace the spirit of biophilia, we can begin introducing plants at home or add nature soundtracks as background noise. The possibilities are endless.
Good evening my dearest followers,
Please, take a moment to enjoy this excerpt for my newest post (Bring Up Blood).
We could most certainly not live without blood. It is absolutely essential for the survival of our most distant limbs and organs. Even though almost all of our respiration is thanks to our respiratory organs, blood is critical to carry oxygen further. Yet, the blood is not only responsible for some part of respiration, but it is also in charge of transporting many nutrients and immune cells. We, imperatively, need to learn more about the different elements of blood to understand its importance and necessity. Four main elements are particularly important: red blood cells, white blood cells, platelets, and plasma. All of these components play a large part in our life. Red blood cells notably carry oxygen, and white blood cells are our primary immune defence against potential chemicals and pathogens. Platelets help the blood coagulate, and plasma is the liquid transporting most nutrients, hormones and cells our body needs.
If you like the excerpt, please click the link below to access the whole article.
We keep hearing on the news of the many achievements made by Artificial Intelligence. From winning at Chess to winning at Jeopardy! against its longest streak-winner, AIs seem to truly outdo themselves. However, nobody can agree if those machines truly hold something we can call Artificial Intelligence. They can’t do more than the task they were built for, and they can’t even understand the game. In other words, they seem to greatly lack intelligence. So, should we find another more fitting definition of intelligence, or should we abandon the quest for human-like intelligence altogether? Personally, I consider that each pursuit for anything close to an Ex-Machina to be a most ambitious quest. The human mind and behaviours are really complex, which even raises questions about true AI’s feasibility. But don’t get me wrong, current AIs are very important. They help us achieve better safety measures, automation and greater management.