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You probably know someone who leaves the last bit of their drink at the bottom of the cup forgotten. There are many people who have this habit. Although, technically speaking, it is not considered a habit.
This behavior is related to a psychological and evolutionary issue that could explain the reason for this seemingly inexplicable attitude. This type of behavior usually happens with drinks such as coffee or tea, but it can be extrapolated to all kinds of liquids and sometimes even to food
Why leave the last sip?
Although it may seem that it is on a whim, leaving the last sip of a delicious drink does not usually have such a trivial reason. The reality is that when a little drink is left, it is usually because there is something in that last sip that makes the person consuming it uncomfortable
There are various nuances that can be found in this last sip that can cause this discomfort. Among them, the texture, the temperature, the sediments, the color... This was commented on by pharmacist @infarmarte on her Tik Tok , who explained that it also happened to her and she thought it was a mania until she found out that there was a scientific basis that explored the reasons for this action
An evolutionary question
Although it may seem curious, this fact could explain an evolutionary question. The residues present at the bottom of the glass could activate the brain circuits that are related to aversion to disgust
Disgust is a fundamental emotion in the evolutionary chain of human beings, since thanks to it, multiple diseases can be avoided. Disgust is related to the instinct to avoid contamination, although this is not real and is only a perception. Therefore, the brain relates the last remnants of drink to something undesirable or that may be contaminating, so it is rejected by the organism
If you want to avoid this happening to you, you'll have to force your brain to consume that last sip. It is also important to note that many drinks leave dregs that can be really unpleasant. Beer, coffee or leaf tea, for example. It is not necessary to consume that last sip, as it may contain a change in taste (often being more bitter) and texture; becoming gritty or pasty. However, the important thing when we enjoy a drink is that we like it, so if we do not enjoy the last sip; there is no point in giving it and it will spoil the consumption