One of the most mentioned processes is the alteration of metabolism. When key organs such as the liver or kidneys decrease their ability to filter and eliminate toxins, certain substances begin to accumulate in the body. Some of these compounds can be released through breath, skin, or body fluids, generating unusual aromas. Some people describe them as sweet, metallic or simply different from the usual smells of the human body.
Changes in blood circulation, which are common in patients with serious diseases or in states of great weakness, also play a role. When blood flow to the skin and extremities is reduced, variations in temperature, humidity, and skin chemistry occur. These conditions can favor the appearance of more intense odors, especially if the person remains at prolonged rest or with very limited mobility.
Another relevant factor is the decrease in appetite and fluid intake, which is common in the final stages of many diseases. Dehydration and fasting change the way the body gets energy, which can generate volatile compounds that are noticeable in the breath or environment. These odors do not represent a danger to those who accompany the patient, but they are a sign of an organism that is going through a situation of extreme fragility.
Human perception also plays a key role. In contexts of emotional stress, anticipatory grief or constant worry, the senses are usually more alert. The brain, when faced with significant situations, can intensify stimuli or associate them with critical moments. Thus, a smell that would otherwise go unnoticed can take on a special meaning when experiencing a situation of farewell or uncertainty.
In different cultures, this phenomenon has been interpreted from symbolic or spiritual perspectives. However, from an informational and scientific perspective, it is important to separate personal beliefs from verifiable facts. So far, there is no solid evidence that confirms the presence of a specific smell capable of directly announcing the death of a person at a given time. What is observed are gradual processes linked to physical deterioration.
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