Many people associate certain scents with memories. Maybe your elementary school teacher smelled of lavender, or the smell of freshly baked cookies reminds you of your grandmother. But did you know that scents can also benefit your health? This practice, known as aromatherapy, has been backed by scientific research. Essential oils can have a powerful effect on your brain, improving your mood, reducing stress, and even improving cognitive function. In this article, we explore how you can effectively use essential oils to support your well-being and boost brain function, and we provide practical advice on how to incorporate them into your routine.
How do smells affect the brain?
Neuroscience has uncovered the mechanisms behind the deep connection between smell and memory, revealing a connection with evolutionary roots. Sandeep Robert Datta, a professor of neurobiology at Harvard Medical School, studies how animals, including humans, use their senses to navigate and interpret the world. He explains that our ancient ancestors used their sense of smell to create mental maps of their surroundings and recall past experiences. “You can think of the primitive brain as having a sense of smell plus a sense of navigation plus a sense of memory,” Datta explains. “That explains why all of these structures are so tightly connected, and why olfactory memories are so evocative.”
Datta continues to emphasize the major role of smell in human cognition and emotion, despite the fact that our sense of smell is less developed than that of other animals. “It is now clear that while our sense of smell is not as robust as that of a mouse or a bloodhound, it is deeply connected to our cognitive centers, our emotional centers, and our memory centers,” he says. “We rely on it to feel well and centered in the world.”
The human nose contains hundreds of specialized olfactory receptors, each designed to interact with specific molecules. When these molecules enter the nose, they bind to their respective receptors, triggering a reaction that Datta likens to “a key being put in a lock.” This process activates olfactory sensory neurons, which sends signals to different areas of the brain. Unlike other sensory information, such as sight and sound, which must first pass through the thalamus before reaching the brain’s emotional and memory centers, the olfactory system is located close to these areas. As Datta notes, the olfactory system “essentially evolved to connect information to these memory and emotional centers.”
This unique connection helps explain why surveys shows that memories triggered by smell are often more emotionally charged and tend to go back further in time than memories evoked by other senses. The smell signals pass through the olfactory bulb, a cluster of nerves responsible for processing odors, before reaching key areas of the brain: the piriform cortex, which identifies odors; the amygdala, which processes emotions; and the hippocampus, which stores and organizes memories. If the hippocampus judges the smell to be important—for example, when it is associated with a particular emotional experience— will it save the memory, so that it can be recalled in the long term. Even many years later, a familiar scent can evoke the same intense emotions and vivid memories as the original experience.
Venkatesh Murthy, head of the Department of Molecular and Cellular Biology at Harvard, also discusses this connection. He reiterates that odor signals travel rapidly to the limbic system, which includes the amygdala and hippocampus, regions crucial for processing emotions and memories. This rapid access to emotion and memory centers further strengthens the emotional strength of scent-related memories.
It is clear that the human sense of smell is closely linked to our emotions, memories and general well-being. The evolutionary development of this connection highlights its importance in helping us navigate the world and recall past experiences. By understanding the science behind how smells trigger memories, we can better appreciate their profound impact on our emotional and cognitive lives and use them to improve our well-being.
What are essential oils?
Essential oils are concentrated compounds extracted from plants that capture the natural scent and flavor, or “essence,” of the plant. Each essential oil has a unique scent due to the different aromatic compounds it contains. There are several methods for extracting these oils, the most common being steam or water distillation and cold pressing.
In steam or water distillation, hot steam or water is passed through the plant material, extracting the essential compounds. In cold pressing, the plant material, such as lemon peel, is mechanically pressed to release the oils. After extraction, the essential oils are often mixed with a carrier oil, such as coconut or jojoba oil, to create a product that is safe and ready to use. It is important to note that essential oils created through synthetic processes are not considered true essential oils.
The extraction process requires a large amount of plant material, which often makes some essential oils quite expensive. For example, it takes around 225 kg of lavender flowers to produce just 1 kg. lavender essential oil, and 4.500 kg of rose petals or lemon balm to get just 1 kg of their respective oils. This high demand for raw materials contributes to the price of some essential oils.
Health benefits of essential oils
The history of aromatherapy
Aromatherapy has been used for thousands of years in various ancient cultures, including China, India and Egypt. These civilizations used aromatic plant-based substances such as resins, balsams, and oils for both medicinal and spiritual purposes. Distillation of essential oils is often attributed to the Persians in the 10th century, but the practice probably predates them.
In the 19th century, French doctors began to recognize the therapeutic benefits of essential oils in treating illness. The term “aromatherapy” was coined by French perfumer and chemist René-Maurice Gattefossé in his 1937 book on the subject. Gattefossé’s interest in essential oils grew after he discovered the healing properties of lavender in treating burns, leading to further exploration of their medicinal potential.
How do essential oils improve health?
When applied to the skin, some of the plant-based chemicals in essential oils can be absorbed into the body. It is thought that certain application methods, such as using heat or applying the oils to specific areas, may increase absorption. However, more research is needed to fully understand how different application techniques affect the effectiveness of essential oils. In general, essential oils should not be ingested, as their chemical compounds can have unpredictable effects on the body.
As previously mentioned, inhaling aromas from essential oils can affect the limbic system, a part of the brain responsible for emotions, behavior, memory, and sense of smell. However, the limbic system also regulates unconscious bodily functions such as breathing, heart rate, and blood pressure. Therefore, essential oils have the potential to affect physical processes and provide benefits such as relaxation or improved mood.
Mental benefits of essential oils
Essential oils have been shown to provide various mental health benefits, including:
- Improving sleep quality: lavender oil is particularly known for improving sleep quality. A study from 2020 showed that both lavender and peppermint oil helped improve sleep quality in people with heart disease compared to a control group that used aromatic distilled water. Another review from 2014, which reviewed 15 studies, confirmed that lavender oil positively affected sleep. Oils like chamomile and lavender are often used to promote relaxation and better sleep.
- Reduces stress, irritability and anxiety: About 43% of the peoplePeople experiencing stress and anxiety seek alternative therapies to relieve them. Aromatherapy has shown promising results in alleviating these symptoms. Surveys shows that inhaling certain essential oils can support traditional treatments to reduce anxiety. lavender oil is often used to relieve stress, while sandalwood helps calm nerves and improve focus. Bergamot is another oil that can reduce stress, and rose oil is known to improve mood and reduce anxiety. Jasmine oil is also used to relieve depression.
- Helps with headaches/migraines: En study from 2012 showed that lavender oil, when applied to the skin, helped reduce headache pain. Additionally, a traditional Persian remedy suggests using a mixture of chamomile and sesame oil on the temples to relieve headaches. Other essential oils, such as ylang-ylang, can help relieve headaches and nausea, while lemon oil is used to improve mood and reduce headaches.
Physical Health Benefits of Essential Oils
Essential oils have been shown to have various therapeutic benefits that support both physical and mental well-being. These oils can be used to manage pain, relieve discomfort, and promote overall health. Some of the key benefits of essential oils include:
- Pain management: En study from 2013 showed that ethereal lavender oil could be effective in managing pain, especially in children recovering from a tonsillectomy. Children who inhaled lavender oil were able to reduce their use of painkillers after surgery. In addition, women often experience stomach cramps during menstruationRose essential oil is known to help relieve these pains, and a study from 2013 showed that aromatherapy with rose oil could also help relieve pain associated with kidney stones.
- Relief of sore joints: Some essential oils are thought to help reduce inflammation, potentially providing relief to those suffering from inflammatory conditions. Pilot studies suggests that oils such as bergamot, cinnamon, orange og frankincense have anti-inflammatory properties. These oils can be particularly effective in soothing sore joints and relieving discomfort caused by inflammation.
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- Relieves discomfort during childbirth: Clary sage essential oil is often used during childbirth due to its potential to reduce stress and relieve pain. It is also traditionally used to relieve menstrual cramps and certain symptoms of menopause. A examination showed that jasmine essential oil, when used for lumbar massage during labor, helped reduce pain and pressure. In addition to pain relief, jasmine is known for its ability to increase libido.
- Improves digestion: Peppermint essential oil is known for its antispasmodic properties, which can help relax the muscles in the digestive tract and relieve constipation. A study from 2008 confirmed that peppermint oil could relieve constipation in people with irritable bowel syndrome. In addition, it contains lemon essential oil powerful antioxidants and anti-inflammatory compounds that can support digestion and reduce inflammation. Research Studies have shown that aromatherapy massage with oils like lemon oil can improve digestive function.
- Strengthens the immune system: The growing problem of antibiotic-resistant bacteria has created interest in alternative ways to fight infections. A study from 2017 showed that massage with lavender essential oil improved the immune system in pregnant women, as evidenced by higher levels of IgA (an immune marker) in their saliva. Tea tree oil is another essential oil with strong antimicrobial and anti-inflammatory properties, making it a valuable tool for fighting infections and strengthening the immune system. Historically, tea tree oil has been used for a variety of conditions, including skin problems and respiratory illnesses.
- Improvement of skin problems: Lemongrass essential oil has natural astringent properties that help fight acne by acting antimicrobially and removing dead skin cells. Ylang-ylang oil can also help inhibit skin pigmentation according to a study from 2015. Tea tree oil is also a popular natural remedy for acne-prone skin. These oils are often used in skincare to promote healthy skin and reduce the appearance of blemishes.
While aromatherapy offers many benefits, it is important to understand that it is not a substitute for professional medical care. Essential oils can relieve certain symptoms, but should complement and not replace treatments prescribed by your healthcare provider. When considering whether to ingest essential oils, be aware that some oils, such as tea tree and eucalyptus, are toxic and can cause serious health problems, including neurological problems, respiratory problems, or organ damage. Swallowing these essential oils can be life-threatening, and it is important to ensure that your essential oils are easily digestible before ingesting them.
How to add essential oils to your routine
Essential oils are a practical way to enhance your health. There are several ways to incorporate essential oils into your everyday life:
- Diffuse them: One of the most popular ways to use essential oils is through diffusion, a form of aromatherapy. Simply mix essential oils with water in an essential oil diffuser, which disperses fine particles of the oil into the air for you to inhale. Be sure to follow the instructions on your diffuser for the correct oil to water ratio. Other aromatherapy methods include:
- Direct inhalation: Open the bottle and take a few deep breaths of the aroma to enjoy its benefits.
- Dry evaporation: Put a few drops of essential oil on a cotton pad and inhale the aroma as it evaporates.
- Steam inhalation: Add a few drops of essential oil to a bowl of hot water, place your head over the bowl, cover your head with a towel, and inhale the steam.
- Dab directly onto skin: Another way to use essential oils is to apply them directly to your skin. The oil is absorbed by your body, allowing you to experience its effects. Many people use rollerball bottles to make it easy to apply. If you have sensitive skin, dilute it. essential oil with a carrier oil like coconut or jojoba oil to prevent irritation.
- Other uses: Essential oils can be used for much more than aromatherapy. Many people use them to give their homes a natural scent or to freshen up their laundry. They are also popular in homemade cosmetics and high-quality natural products. Some studies suggest that certain essential oils can be used as a safe, environmentally friendly alternative to synthetic mosquito repellents. In addition, surveysthat certain oils may have properties that help extend the shelf life of foods, providing a natural preservative option for the food industry.
Essential oils have a wide range of benefits that can improve both physical and emotional well-being. From promoting better sleep and reducing stress to supporting the immune system and improving skin health, these natural compounds have proven their versatility. Whether through diffusion, topical application or other creative uses, essential oils provide an accessible and enjoyable way to incorporate wellness into daily life. At CBD Denmark we ensure that our essential oils are organic, pesticide-free and come from reliable producers to guarantee their quality. By choosing our essential oils With high-quality ingredients, you can experience the many natural benefits they offer without having to stress about what you're adding to your routine.
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Works cited
Ayan, Murat, et al. "Investigating the Effect of Aromatherapy in Patients with Renal Colic." The Journal of Alternative and Complementary Medicine, Vol. 19, no. 4, Apr. 2013, pp. 329–333, https://doi.org/10.1089/acm.2011.0941. Accessed 16 Dec. 2021.
Cleveland Clinic. "11 Essential Oils: Their Benefits and How to Use Them." Cleveland Clinic, Dec. 14 2021, health.clevelandclinic.org/essential-oils-101-do-they-work-how-do-you-use-them.
Cronkleton, Emily. “Aromatherapy Uses and Benefits.” Healthline, 15 May 2018, www.healthline.com/health/what-is-aromatherapy.
de Sousa, Damião Pergentino, et al. "A Systematic Review of the Anxiolytic-like Effects of Essential Oils in Animal Models." Molecules (Basel, Switzerland), Vol. 20, no. 10, 2015, pp. 18620–60, www.ncbi.nlm.nih.gov/pubmed/26473822, https://doi.org/10.3390/molecules201018620.Accessed 18 June 2019.
Ebrahimi, Hossein, et al. "The Effects of Lavender and Chamomile Essential Oil Inhalation Aromatherapy on Depression, Anxiety and Stress in Older Community-Dwelling People: A Randomized Controlled Trial." EXPLORE, vol. 18, no. 3, Jan. 2021, https://doi.org/10.1016/j.explore.2020.12.012.
Farrar, Ashley J., and Francisca C. Farrar. “Clinical Aromatherapy.” Nursing Clinics of North America, Vol. 55, no. 4, 2020, pp. 489–504, www.sciencedirect.com/science/article/pii/S0029646520300475, https://doi.org/10.1016/j.cnur.2020.06.015.
Ford, AC, et al. “Effect of Fiber, Antispasmodics, and Peppermint Oil in the Treatment of Irritable Bowel Syndrome: Systematic Review and Meta-Analysis.” BMJ, vol. 337, no. Nov13 Nov 2, 13 2008, pp. a2313–a2313, https://doi.org/10.1136/bmj.a2313.
HERZ, RACHEL S. "Are Odors the Best Cues to Memory? A Cross-Modal Comparison of Associative Memory Stimuli." Annals of the New York Academy of Sciences, vol. 855, no. 1 OLFACTION AND, Nov. 1998, pp. 670–674, https://doi.org/10.1111/j.1749-6632.1998.tb10643.x.
Keshavarz Afshar, Mahnaz, et al. "Lavender Fragrance Essential Oil and the Quality of Sleep in Postpartum Women." Iranian Red Crescent Medical Journal, Vol. 17, no. 4, 25 Apr. 2015, https://doi.org/10.5812/ircmj.17(4)2015.25880.
Kim, Myung Ae, et al. "Effect of Aromatherapy Massage for the Relief of Constipation in the Elderly." Journal of Korean Academy of Nursing, Vol. 35, no. 1, 28 Mar. 2017, pp. 56–64, synapse.koreamed.org/articles/1063390, https://doi.org/10.4040/jkan.2005.35.1.56.
Lillehei, Angela S., and Linda L. Halcon. "A Systematic Review of the Effect of Inhaled Essential Oils on Sleep." The Journal of Alternative and Complementary Medicine, vol. 20, no. 6, June 2014, pp. 441–451, https://doi.org/10.1089/acm.2013.0311.
McDonough, Molly. "The Connections between Smell, Memory, and Health | Harvard Medicine Magazine." Magazine.hms.harvard.edu City of Kyiv, Ukraine, magazine.hms.harvard.edu/articles/connections-between-smell-memory-and-health.
Miles, Amanda N., and Dorthe Berntsen. "Odour-Induced Mental Time Travel into the Past and Future: Do Odor Cues Retain a Unique Link to Our Distant Past?" Memory, vol. 19, no. 8, Nov. 2011, pp. 930–940, https://doi.org/10.1080/09658211.2011.613847.
National Cancer Institute. "https://Www.cancer.gov/Publications/Dictionaries/Cancer-Terms/Def/Olfactory-Bulb.”www.cancer.gov, 2 Feb. 2011, www.cancer.gov/publications/dictionaries/cancer-terms/def/olfactory-bulb.
Sasannejad, Payam, et al. "Lavender Essential Oil in the Treatment of Migraine Headache: A Placebo-Controlled Clinical Trial." European Neurology, Vol. 67, no. 5, 2012, pp. 288–91, www.ncbi.nlm.nih.gov/pubmed/22517298, https://doi.org/10.1159/000335249.
"Scientists Decode How the Brain Senses Smell." NYU Langone News, nyulangone.org/news/scientists-decode-how-brain-senses-smell.
Tan, Loh Teng Hern, et al. "Traditional Uses, Phytochemistry, and Bioactivities Of Cananga Odorata (Ylang-Ylang)." Evidence Based Complementary and Alternative Medicine, vol. 2015, 2015, pp. 1–30, www.ncbi.nlm.nih.gov/pmc/articles/PMC4534619/, https://doi.org/10.1155/2015/896314.
Veiskaramian, Atefeh, et al. "Effect of Aromatherapy with Melissa Essential Oil on Stress and Hemodynamic Parameters in Acute Coronary Syndrome Patients: A Clinical Trial in the Emergency Department." Complementary Therapies in Clinical Practice, vol. 44, Aug. 2021, p. 101436, https://doi.org/10.1016/j.ctcp.2021.101436. Accessed 28 Aug. 2021.
Walsh, Colleen. "What the Nose Knows." Harvard gazette, 27 Feb. 2020, news.harvard.edu/gazette/story/2020/02/how-scent-emotion-and-memory-are-intertwined-and-exploited/.
West, Helen. “What Are Essential Oils, and Do They Work?” Healthline, Healthline Media, 30 Sept. 2019, www.healthline.com/nutrition/what-are-essential-oils#how-they-work.
"What Are Essential Oils? Uses and Side Effects." Www.medicalnewstoday.com, Oct. 18 2019, www.medicalnewstoday.com/articles/326732#overview.
Zargaran, Arman, et al. “Potential Effect and Mechanism of Action of Topical Chamomile (Matricaria Chammomila L.) Oil on Migraine Headache: A Medical Hypothesis.” Medical Hypotheses, Vol. 83, no. 5, 1 Nov. 2014, pp. 566–569, pubmed.ncbi.nlm.nih.gov/25238714/, https://doi.org/10.1016/j.mehy.2014.08.023.