Bodily odour, or bodily smell, is usually caused by sweat glands, particularly in the armpits, groin, feet, and mouth.
Some diseases and even potential health issues like hormone fluctuations, diabetes, metabolic disorders and cancer may be detected by specific bodily smells caused by bacteria.
Low levels of Magnesium and Zinc and unbalanced levels of Insulin in the body may also cause some Bodily Smell issues. 
Hyperhidrosis, the condition that causes the sweat glands to over produce sweat, can be an issue causing stinky feet or stinky armpits. 
Bad oral hygiene and even apnea  can cause bad breath. Lactose Intolerance may cause some bodily odours too. Also, another indication of production of bodily smell can be related to low level of Proteins and Fats. 
Inside our Body: the Upper Respiratory Track, Digestive, Urinary and Reproductive Systems can produce Bodily Smells by being in contact with bacteria or metabolic disorders presenting difficulty processing food or milk and hormonal imbalance. 

Bodily odours can come in different categories: Sour, Rancid, Creamy, Cheesy, Sweaty, Yeasty (often associated with vaginal discharge). 
A condition that makes people smelling like rotten fish is called Trimethylaminuria. This condition is a metabolical condition with no cure, but treatment to reduce the symptoms by prescribing very specific diet avoiding specific food like: milk, eggs, liver, peas, beans, peanuts, brussel sprouts, broccoli, cabbage, cauliflower, fish oil supplements, soya products, seafood and fish that are not just fished from fresh water. Also, the use of specific soaps and lotions and managing stress, anxiety and depression may contribute to a better bodily odour. 

The mouth is a perfect environment for all types of bacteria to grow.
When the bacteria breaks down substances inside our mouth, they create foul smelling byproducts. This leads to bad breath and dental side effects. 
Bad smell in the mouth, “bad breath”, indicates there is an infection in the body, either in the mouth, digestive system and even sinus infections affecting the throat. Upper respiratory track infections can also show symptoms on the tongue and produce bad smell in the mouth. Allergies can play a role, like “hay fever”, with watery eyes, dripping nose and stuffy nose, in producing bad breath smell. 
When having a Blood Sugar Imbalance, causing burning fat to gain energy, instead of burning sugar. Fat burning produce ketones in the body producing a Fruity Bodily Smell in the mouth. 
When having Lactose Intolerance, bad breath smells like spilled milk or cheesy, may indicate an improper digestion of milk producing digestive issues like gas and bloating usually accompanied with lactose intolerance. Always have Mint handy for bad breath and also have a routine in Oral Hygiene daily at least 2 times a day.

Another aspect that may alter the body chemistry, in the case of women is Pre-Menopause, Menopause and Post-Menopause.
The low oestrogen levels caused by Menopause, increase body odour due to higher relative testosterone levels, which attract more bacteria to sweat. Reduced oestrogen leads to hot flashes and night sweats, increasing perspiration. This hormonal shift can change sweat composition, resulting in a stronger, more pungent smell. Low oestrogen also contributes to the skin causing an increase in sebum production, contributing to a stronger body smells. As part of Menopause, Anxiety and Stress can trigger the apocrine glands to produce “stress sweat” which is stronger than normal sweat. Personal Hygiene is important, sensible deodorant products, clothing and life style including diet. 

​The Loss of Sense of Smell and Some of its Causes. 

As to Olfactory Dysfunctions, like Anosmia and Ageusia, they involve the incapacity of detecting smells or loss of smell and the incapacity of detecting flavours or loss of taste.  
Anosmia can be a condition triggered by anxiety and chronic stress or a nasal condition commonly linked to viral infections, in recent times we can consider COVID-19. The Brain chemistry and structure can be affected by Chronic Stress affecting the Olfactory tract and decrease GABA levels, which are involved in the processing of scent. When there is a Cortical Amygdala Dysfunction associated by Anxiety, there is a reduced odour discrimination and identification, likely because the brain structures in the Limbic System (the amygdala and olfactory cortex) responsible for the Emotions and Sense of Smell overlap. When there is Hyper-Vigilance, causing high levels of anxiety, this may cause odour sensitivity impairment, as the brain is over focused on detecting potential dangers or threats (like toxic smells), leading to a distorted sense of smell or perceived impairment. Where there is constant stress and anxiety in high levels and the experience of traumatic experiences, the sense of smell gets affected by symptoms of Anosmia. It is recommended as a treatment for Stress related Anosmia and Ageusia to use Mindfulness, Meditation, Counselling and Olfaction Training.
People suffering from Anosmia and Ageusia and relative conditions like Dysosmia and Dysgeusia may present risk factors for depression and suicidal ideation. Also, there has been a research study stating that a deficiency of serotonin can lead to Anosmia and Ageusia.  
People suffering from Anosmia have feelings of loneliness, fear, depression and difficulties in forming social and sexual relationships and have poor personal hygiene. 
People suffering from Ageusia or Dysgeusia have taste disturbances or loss of taste, having negative impact in nutrition, leading to depression. 
The dysfunction of Smell and Taste can amplify the psychological distress and bringing poor quality of life. 

Are there people with no Bodily Smell? ​
Reading the novel of Patrick Süskind “The Perfume”, always fascinated me the main character in the novel, “Jean-Baptiste Grenouille” who was born with an extraordinary sense of smell, but he lacked bodily smell. He could smell and categorise every smell around him and even in distances far away from him. But people around him were not able to detect on him any kind of bodily smell. I thought that was just part of the story in the novel, but indeed, there is a few people in the world that do not emit bodily smells. ​  

Having no noticeable body odour, or body smell, particularly in under ams or armpits, means the  person has a genetic variant affecting sweat glands function, resulting in lack of compounds bacteria needed to produce smell. This trait is primarily linked to the ABCC11 non-functioning gene mutation and it is very common in East Asian populations. The ABCC11 non-functioning gene mutation is responsible for transporting substances to the armpits. Due to a mutation that stops this transport, the apocrine sweat glands do not secrete the compounds that bacteria requires to break down to create odour.  

This non-functioning gene mutation of ABCC11 affects mainly people of East Asian descent (80% - 95%), while it is rare in people of African and European descent (2%).
The reason these kind of people with this gene mutation do not smell, or have very low bodily smell is that there is a lack of nutrients produced in their sweat that the Staphylococcus hominid bacteria, related to the production of sweat, does not have enough sweat glands nutrients to produce sulfur-based compounds that smell. 

Another interesting characteristic of people with ABCC11 non-functioning gene mutation, is that they have dry or flaky earwax, rather than wet or sticky earwax. 
The ABCC11 gene is responsible for encoding a protein involved in transporting molecules across celular membranes. These proteins like lipophilic substances, bile acids, conjugated steroids, a component found in apocrine sweat and earwax which results in odour and wet earwax. One component of the sweat is an odourless S-glutathione conjugate, which it is used in certain types of bacteria, and the change of what is transported in the sweat means which bacterias are able tu survive in that transport. The S-glutathione conjugate provides the sweaty odour. People with ABCC11 non functioning gene mutation may have less sweaty armpits than people with the functioning version of the gene and bacteria cannot metabolise any organic compounds to produce typical bodily odour. 
​
People with GG and GA alleles - a type of gene variant - may have increased bodily smell. People with AA alleles may have little to no bodily smell. 
Other factors contributing to not having or almost inexistent Bodily Smell, unrelated to gene mutation, are Diet, Low-Stress levels, Nose Blindness. 
People who do not eat Garlic, Onions and Curry may have very reduced bodily odour. 
People experiencing very low levels of stress, have their apocrine glands not activated or have very low activation, leads to having no smell or very low smell.
People exposed to their same smell, may present no sensitivity to their own smell thinking they do not present any smell. In this case the brain filters out a constant long-term stimuli. ​

Before exploring how scents influence our emotions, it’s essential to understand what emotions are.

Emotions are strong feelings that arise from one’s circumstances, mood, or relationships with others. They are physical and mental states triggered by neurophysiological changes, linked with thoughts, behaviours, and bodily responses. Emotions are essentially reactions to external or internal events and situations, shaped by the context in which they occur. Research has shown that different scents can evoke a wide range of emotional responses— shifting our moods and feelings in distinct, often powerful ways.

​How do Scents act on our Emotions?
The connection between scent and emotion lies in the biology of our olfactory system and its direct link to the brain. When we inhale, aromatic molecules are captured by the olfactory epithelium, a region inside the nasal cavity that contains 6 to 10 million receptor cells. 
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These cells have tiny hair-like structures called cilia, which are coated in a thin layer of
mucus. This mucus is essential in trapping and transporting the scent molecules.
The olfactory bulb—a structure about 2 to 5 square centimetres in size at the base of the
brain—acts like a computer chip. It receives the information from the olfactory nerves, filters and partially decodes the scent, and passes the signal to the olfactory tract.
From there, the signal travels to several brain areas, including:
• The Amygdala
• The Hippocampus
• The Thalamus
• The Orbitofrontal Cortex
These regions are key components of the limbic system, the part of the brain responsible for processing memories and emotions.
This is significant: smell is the only sense directly connected to the limbic system, which is why scents have such a strong emotional impact.

The Healing Frequencies of Nature
Natural olfaction gives us access to the vibrational frequencies of raw materials such as rose, jasmine, lavender, rosemary, and frankincense. Each of these plants carries unique energetic properties and healing potential.
• Natural perfumery combines the art of creating aesthetically pleasing fragrances with the therapeutic benefits of natural raw materials.
• Natural aromatherapy uses these materials specifically for healing purposes—to treat physical, emotional, or mental conditions.
Emotions and Aromatherapy
Since ancient civilizations, emotions have been studied and classified. Modern psychology often identifies six core emotions: