Food and Our Bacterial Mix – Can we really change them both?
A few weeks ago (June 2012), a paper in Nature by a group of researchers suggested that despite the vast geographical and nutritional differences in the human population, that just three predominant bacterial clusters (referred to as enterotypes hereafter) could explain all of our gastric microbial mixes.[1] This they suggest indicates the existence of a limited number of well-balanced host–microbial symbiotic states that might respond differently to diet and drug intake.
Each of these three enterotypes are identifiable by the variation in the levels of one of three genera: Bacteroides (enterotype 1), Prevotella (enterotype 2) and Ruminococcus (enterotype 3). These enterotypes are not as sharply delimited as, for example, human blood groups; they are, in contrast, densely populated areas in a multidimensional space of community composition. They are nevertheless likely to characterise individuals, in line with previous reports that gut microbiota are quite stable in individuals and can even be restored after perturbation.[2]
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Microbes Are What You Eat
Most nutritional therapists and others that regard the role of the bacterial populations in the human gut as being a significant part of our capacity to operate and function in health or otherwise, understand that food choice has an effect.
A recent study on mice published in Science raises some very interesting early observations.[1] The same group published an earlier study exploring the same strategy.[2] Aware that food choices alter bacterial colony ratios and may favour certain bacterial species over others, mice were impregnated with a small number of commonly found human bacteria (10) and then were fed, via human pureed baby food concentrations of 4 commonly consumed ingredients. The researchers state that some 60% of the variation in species is attributable to dietary food choice.
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Vegas, Pregnancy, Immunity and Allergy Prevention!
The saying is ‘what happens in Vegas stays in Vegas’, or if you are English ‘what happens in Blackpool….’ but the same cannot be said about what happens in utero, as increasing evidence supports the understanding that the maternal nutritional environment and early feeding affects the health of the foetus beyond infancy and into adulthood.[1],[2] An article in Nature’s Mucosal Immunology this month explores some of the key events in foetal and neonatal immune management.[3] It stimulated a revisit to the area of what to consider for parents to be and mums of young children when they ask ‘is there anything I can do to prevent or reduce the risk of allergy or atopy in my child’.
The first moments, weeks and months of life can determine the health outcomes of an individual over the duration of their lifetime and this knowledge represents a significant choice for prospective parents. Fortunately the remarkable adaptability of the immune and central nervous system means that there are numerous opportunities in the early years of life to positively influence health outcomes even if the early stages were less than optimal.
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Fat – I’m Not To Blame Its My Bugs!
A trial to see if the ingestion of a probiotic bacterium enriched drink might have a beneficial impact on central obesity was funded by Snow Brand Milk Products company in Japan and the results were published in the European Journal of Clinical Nutrition this June 2010. [i]
Whilst it may seem a stretch that bacteria can influence our body mass, (I have written a previous review) it is an area of growing interest and investigation as bacteria have previously been implicated in the metabolic storage of fat. Studies in mice have shown up to 30% greater fat storage in mice with gastrointestinal colonies of commensals rather than their skinnier counterparts operating with sterile guts.
One proposal for this is that certain bacteria (Bacteroides Thetaiotaomicron is one likely contender) are able to manipulate energy to be stored in adipocytes through a pathway that involves microbial regulation of the intestinal epithelial expression of fasting-induced adipocyte protein (Fiaf), a circulating inhibitor of lipoprotein lipase (LPL).[ii]
The microbiota can then, based on this and other studies be viewed as a metabolic “organ” exquisitely tuned to our physiology and performing functions that we have not had to evolve on our own.
Neurological/Dietary Control Over the Immune System – The Role of Fats
The immune system in humans and animal is complex, all the more so because it crosses over all tissues. The traditional view has been that the immune system keeps itself in check, and that is mostly the case. However, for some years there has been a development of a neural feedback loop comprehension that helps to answer some of the complex mechanisms and remarkably ties in the role of a nutritional strategy for immune management. This is known as the inflammatory reflex.
The inflammatory reflex, a prototypical neural circuit that modulates innate immunity, is activated by the presence of cytokines or other inflammatory products in tissues that triggers afferent (a nerve that passes impulses from receptors toward or to the central nervous system) action potentials travelling in the vagus nerve. The ascending information is relayed to brainstem nuclei that control efferent (nerves that convey nervous stimulus from the brain to other parts) neural signals in the form of action potentials transmitted back to the periphery via the vagus nerve.
Whilst this may sound complex – few subjects that combine neurology and immunology aren’t… the outcome suggested meets simple strategies, based on complex mechanisms.
Butyrate Improves Bowel Transit
Problems such as poor transit or constipation are common, and can produce significant misery for the individual compromised in this manner. Butyrate is a short chain fatty acid, manufactured in the gut by the anaerobic fermentation of dietary fibres by resident microbiota. It is proposed that apart from its already well understood properties that it has another remarkable effect – the ability to increase the neuronal concentration of the Enteric Nervous System.[1]
Butyrate-generating foods and supplements might become an effective and simple option to prevent or treat functional gut disorders via modulation of enteric neuroplasticity.
If Genes Are Protected By Nutrients – How Much Should We Eat?
Prof Bruce Ames has developed the concept of Triage consumption, where micronutrient needs and availability may not always be in synchronicity and has recommended that a larger overall consumption of micronutrients on a daily basis be considered a judicious way to limit DNA damage associated with aging and disease.
I have proposed that the expensive urine criticism is perhaps one of the most damaging of slights, and that Victor Herberts slur on the use of increased exogenous nutrients via supplementation has created more damage to human health than it has saved. A paper out in the American Journal of Nutrition, May 2010 has added some further clarity to this discussion.[1]
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Dr’s Make Blood Pressure Soar!
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In the ever increasing fight against vascular disease and related health problems the role of the silent marker – Blood Pressure has always been regarded as a sentinel sign. The levels determined to be safe have been adjusted over the years to try and develop a public and medical policy towards compression of risk. Therefore nurses and Dr’s perform clinic blood pressure tests to look for indications of different states of hypertension. This study from the BMJ indicates who and how, has significant effects on results/intervention.[1]
Anti-Aging – Look & Function Years 12 years Younger
The idea we can live forever is still a fantasy, but living with reduced rates of mortality and morbidity are very achievable and represent perfectly reasonable aims. Outside of aesthetic objectives remaining a viable member of society and family through continued avoidance of disease and management of overall productive energy are perfectly fair aims.
The Journal Archives of Internal Medicine published a compelling study in April, looking at the effects of lifestyle habits on the risks for future mortality in the British population.[1]
The key elements – smoking, exercise, diet and alcohol were tracked in a prospective cohort study design. Just under 5000 people with an average age of 44 were followed for 20 years.
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Leaky Gut & Food Reactivity – What’s the Mechanism?
Michael Ash looks at leaky gut with a contemporary approach to investigation, relevance and restoration. It is quite clear that in order to extract nutrients and other sentinel information carrying agents the barrier that divides the contents of the gastric lumen from the host must be permeable. The question that has interested clinicians for many years is – when is it too permeable and what does that mean in terms of health and illness.
A paper in the March edition of Mucosal Immunology explores this concept in some detail and delivers some much needed information and potential direction in terms of dietary management and risk.[1]
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The immune system is prone to the same grave misfortunes as any defense system handling weapons: collateral damage that comes with the destruction of the enemy on one’s own territory and friendly fire due to mistaken identity. Whereas the collateral damage is the price we pay for clearance of infections, autoimmunity is a pathological process. Nevertheless, the effector mechanisms involved in both processes are the same. Whether environment can be a cause, a trigger or an amplifier of an autoimmune disease are questions that are being intensively investigated.
