The Gut Microbiome: How Herbs and Spices Impact Your Health

 The Gut Microbiome: How Herbs and Spices Impact Your Health


 Have you ever wondered if the sprinkle of herbs and spices on your plate could improve your health? Herbs and spices might play a surprising role in keeping you healthy. You might know that the gut microbiome – the microbial community living in our digestive system – modulates our mood, immunity and even our behaviour. But did you know that some of the best ways to take advantage of the gut microbiome are through herbs and spices? How exactly do herbs and spices interact with the microbes living in our guts? Let us take you on a tour of how these culinary favourites can influence your gut microbiome, and ultimately your health.



The Gut Microbiome: How Herbs and Spices Impact Your Health

Introduction to the Gut Microbiome


 The term gut microbiome refers to the community of microorganisms living in our digestive system. The gut microbiome is a complex ecosystem of trillions of bacteria, fungi, viruses and other microorganisms. Evidence is accumulating that the gut microbiome plays a significant role in our health and wellbeing. From digestion to immune function, the gut microbiome has been implicated in many areas of human physiology. Recently, herbs and spices have emerged as potential modulators of gut microbiome health.



The Role of the Gut Microbiome in Health


 It is well-known that our gut microbiome serves as a master controller of many physiological processes, including the digestion and absorption of nutrients and vitamins, the synthesis of other compounds, and most importantly, the development and maintenance of the immune system. It is also clear that the gut microbiome plays a role in mental health, metabolism and the development of chronic diseases such as obesity and inflammatory bowel disease (IBD). A balanced and healthy gut microbiome is necessary for human health, and disease can result when the microbiome becomes unbalanced.


Understanding Herbs and Spices


 Herbs and spices are used for culinary and medicinal purposes, and have traditionally been derived from different plant parts, including leaves, stems, roots and seeds. Flavoured with a rich bouquet of chemicals, their notable characteristics are their taste and odour. Herbs and spices are widely used to impart flavour to food, but they also contribute to overall human nutrition with their bioactive compounds comprising mainly of polyphenols, terpenes and antioxidants. These bioactive phytochemicals are thought to be responsible for the gut microbiome altering effects of herbs and spices.


Overview of the Gut Microbiome and Herbs/Spices Connection


 Here’s the connection between the gut microbiome and the herbs/spices: both modulate the structure and/or function of the gut microbial community – in the case of herbs and spices, it’s the former. Examples of this gut-improving trait of herbs and spices can be found in some in vitro and animal studies. Changes in the composition and/or metabolic activity of the gut microbiome alter gut and/or host physiology, thereby affecting our health, as I’ll illustrate below. First, let’s see how herbs and spices might influence the gut microbiome.





1. Gut Microbiome Diversity


1.1. How Herbs and Spices Influence Gut Microbiome Diversity


 Research indicates that some herbs and spices help to increase gut microbiome diversity. Diversity refers to the number of distinct species of microbes present in the gut. A diverse gut microbiome is a healthful one, and has been associated with a wide range of health metrics. Certain herbs and spices, including turmeric, ginger and garlic, have been shown to increase the number of beneficial bacterial species being represented in the gut, in addition to increasing the number of beneficial bacteria that are associated with a robust and healthy gut environment, such as Bifidobacterium and Lactobacillus.


1.2. The Impact of Gut Microbiome Diversity on Health


 A diverse gut microbiome can prevent harmful bacteria from overgrowing; it aids in nutrient absorption; and it aids in strengthening our immune system (which might explain why a diverse gut microbiome is linked to a lower risk of obesity, diabetes and allergies). Herbs and spices have the potential to help increase gut microbiome diversity, and therefore contribute to both health and prevention of disease. 


2. Gut Microbiome Composition


2.1. How Herbs and Spices Affect Gut Microbiome Composition


 The gut microbiome’s composition is the characteristics of the different microbes residing in the gut, including their relative abundance. Some herbs and spices have a direct impact on gut microbiome composition. The intake of cinnamon has been shown to increase beneficial bacteria, like Bacteroidetes, while countering the abundance of less desirable bacteria, such as Firmicutes. On the other hand, herbs like oregano and thyme are antimicrobial and hence can help to maintain a healthy gut microbiome.


2.2. The Significance of Gut Microbiome Composition for Health


 The composition of the gut microbiome can largely determine one’s health status. Changes in the composition of the gut microbiota, called dysbiosis, are closely linked to human diseases, such as obesity, inflammatory bowel disease and even mental health disorders. By modifying gut microbiome composition, herbs and spices could promote a more ‘healthy’ microbial balance and improve health.


3. Gut Microbiome Function


3.1. How Herbs and Spices Enhance Gut Microbiome Function


 Besides changing the structure and diversity of the microbiome, herbs and spices also can improve its function. Herbs and spices may stimulate the growth of beneficial bacteria, increase production of SCFAs and improve general gut health. For example, preliminary studies suggest that many active components present in ginger and licorice root can stimulate the growth of beneficial bacteria and improve the function of the gut microbiome.


3.2. The Importance of Gut Microbiome Function in Maintaining Health


 Maintaining optimal gut function requires a well-balanced gut microbiome that can break down food into its constituent components, produce essential nutrients, and regulate the systemic immune response – a microbiome that is essential for good health. Dysfunction of the gut microbiome has been implicated as a cause or an aggravating factor in human health disorders, ranging from gastrointestinal disorders, such as inflammatory bowel disease, to metabolic disorders, such as obesity and type 2 diabetes, as well as neurodegenerative disorders such as dementia. By increasing microbiome function, herbs and spices might help to improve health and wellbeing.



4. Gut-Brain Axis


4.1. How Herbs and Spices Influence the Gut-Brain Axis


 The gut-brain axis is a complex bidirectional communication system between the gut and the brain that involves intricate connections between the gut microbiome, the enteric nervous system and the central nervous system. Accumulating evidence suggests that herbs and spices may modulate the gut-brain axis via the microbiome. Several bioactive constituents of herbs and spices have been reported to exhibit neuroprotective effects and to play beneficial roles in brain health. For instance, curcumin, a natural polyphenol present in turmeric, has been reported to have several neuroprotective effects and to modulate the gut-brain axis.


4.2. The Role of the Gut-Brain Axis in Overall Well-being


 The gut-brain axis is a vital link for overall health, and is associated with mood, cognition and even behaviour. Alterations in the gut microbiome and the gut-brain axis have been implicated in various mental health disorders including anxiety and depression, and herbs and spices with the potential to modulate the gut-brain axis via their effects on the gut microbiome might offer a novel avenue for therapeutic approaches for mental health. 


5. Gut Microbiome and Disease


5.1. The Impact of Herbs and Spices on Gut Microbiome-Related Diseases


 For example, for gut microbiome-related diseases, including inflammatory bowel disease (IBD), herbs like curcumin, boswellia and aloe vera, among others, have shown anti-inflammatory properties and some degree of efficacy in the management of these symptoms. For other gut microbiome-related diseases, including obesity and metabolic syndrome, herbs and spices can also act through multiple mechanisms of action on the gut microbiome.


5.2. Potential Therapeutic Approaches with Herbs and Spices


 This gut microbiome effect of herbs and spices points to a new avenue of therapeutic treatment by targeting the gut microbiome via herbs and spices. By using herbs and spices to modulate microbial imbalances, it might be possible to improve disease conditions and outcomes. More research is needed to decipher the exact mechanisms by which herbs and spices exert their effects, as well as to refine the optimal dosing and formulations to be used as therapeutics.


Conclusion


 As such, it is an incredibly dynamic ecosystem that can exert crucial effects on our health and wellbeing. Herbs and spices have been identified as potential modulators of gut microbiome diversity, composition and function, and it is clear that maintaining healthy gut microbiome function can potentially have broad physiological implications, including for mental as well as digestive health. Although more research is necessarily required, especially in the form of clinical trials, to clarify the mechanisms and therapeutic potential of herbs and spices in relation to the gut microbiome, the use of these flavourful ingredients in our diets appears to be a promising avenue for health-promoting effects on gut health.
Location: East Kilbride, Glasgow, UK

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