The human body is inhabited by hundreds of species of microorganisms—mainly bacteria living in the gut—which are collectively known as the microbiome. The number of bacterial cells matches that of human cells, with approximately ten trillion for an average adult. However, the importance of the microbiome comes not from its numbers, but from its activity. Scientists now see the microbiome as the forgotten organ, with metabolic activity often parallel to that of the liver.
The human gut microbiome co-evolves with the host in a symbiotic relationship. Through diet, nutrients are delivered to help gut microbes to grow, while they produce essential nutrients, such as vitamins and short chain fatty acids, which are essential for wellbeing. Over the last decade, research has shown the microbiome performs an active role in cardiovascular well-being and many metabolic activities are jointly carried out through the cross-talk between the body and the gut microbiome. It is also now known these microbes can produce certain chemicals to communicate with different parts of our body such as the liver—a network known as the gut-liver axis—and even the brain—the gut-brain axis. Altered microbiomes have been linked to very different health issues, ranging from digestive problems, autoimmune conditions and metabolic diseases to obesity and even autism. The discovery the microbiome is crucial for human wellbeing has changed how scientists understand and manage disease, creating huge interest in finding ways to modulate microbiomes and restore them to normality. Probiotics and prebiotics are the two main dietary strategies in this field.
The first approach provides the gut microbial community with live microbes known as probiotics, whose activity can mediate health benefits. Probiotics have been used for millennia in fermented foods and, at present, most strains have been developed to support general digestive wellness and immunity. Advances in our understanding of the gut microbiome composition and function now enable us to develop probiotic strains with activities that bring specific health advantages, such as Lactobacillus plantarum LPLDL®—a next-generation probiotic capable of modulating the gut-liver axis, which is heavily involved in cardiovascular health.
The second strategy centres around providing dietary ingredients selectively utilised by the host microorganisms which confer health benefits, known as prebiotics. Gut microbes are adapted to make use of food ingredients that the human organism cannot, such as fibre, the breakdown of which can have a direct or indirect impact on a large number of intestinal microbiome members. The key feature of prebiotics, however, is specificity—stimulating the growth and activity of only those microbes that can help the human host. Achieving true selectivity in an ecosystem as complex as the human gut is difficult, which is evident in the common occurrence of gastrointestinal side effects upon prebiotic ingestion, and the reason why prebiotic precision is key in ensuring only targeted microbes are enhanced. LPGOS® from OptiBiotix is an example of selective microbiome focus—a galactooligosaccharide (GOS) specifically targeting L. plantarum LPLDL with the capacity to enhance its metabolic activity and growth within the gut microbiome.
Harnessing the microbiome is the next frontier in human health, the full potential of which we are only starting to discover. Probiotics and prebiotics are among the most promising dietary approaches for gut microbiome modulation, with specificity in their mode of action and well-being benefits key to pushing the boundaries of disease management.