What are Probiotics? #Pint2014

My Dear Sexy Readers,

We are all so conscious about what we ingest, what we put on and in our body, but still... Liver diseases, Obesity and Type II diabetes are on the increase!

Last week I went to a pub talk on Probiotics. That's right, I went down to the pub, and I listened to a scientist talk about her research using Probiotics to relieve liver disease. 

If you have followed my recent posts (HERE and HERE), you know that #Pint2014 was in full swing 19th-21st May all over the world! An international Science festival happening over 3 nights in the UK, Ireland, France, Switzerland, Australia and in the US! 

I already covered the first pub talk I went to, which was on the liver. 
That same evening, Dr Jane Macnaughtan was sharing with us the latest results on her research sponsored by Yakult (Oh yes, but before you say anything, Yakult didn't commission the research, the research lab contacted Yakult for advice and funding). 

Why is this important? Because more and more, I see scientific articles claiming that this or that disease is controlled by the bugs residing in our gut linings, that they are the real brain in our body. 

So I'll start with some basic info, and I will include Dr Jane talk in "quotes".

Our gut bacteria

Humans are now thought as super-organisms on the basis of the genetic potential encoded within our resident microbial populations in addition to our own genome. 

"If our body is composed of about 10 trillion cells, we also contain 100 trillion bacteria!"

There are varying levels of bacteria living all over and in our bodies - mostly in our intestines.
They are known as commensal bacteria, which under normal circumstances cause no harm. 

It has been noted that although there is a great inter-individual variation in the composition of the gut microbiota, there are conserved set of encoded functions shared between individuals referred to as the core gut microbiome.  

Functions of this microbiome are thought to confer the greatest benefit to the host and are probably essential for the correct functioning of the gut.

Benefits:

• Modulation of the host immune system  from early life
• Protection against potential pathogens by depriving polluting and dangerous bacteria of food and inhibiting their growth.
• Production of essential vitamins and hormones
• Digestion of sugars and regulation of fat storage

Other functions include:
They facilitate the process by which food and wastes move through the system to avoid constipation, they look after the mucus membranes by stimulating the production of proteins that lubricate and protect our 'inside' skin, they secrete nutrients that are used for tissue repair, they improve the balance of friendly flora to reduce the risk of bladder or vaginal infections. 

However, our natural prebiotic levels are easily damaged by factors such as poor diet, stress, alcohol, hormonal fluctuations, cigarettes, surgery and drugs. 

"'All Diseases begin at the gut' - Hippocrates"

Many diseases have been associated with a dysfunctional microbiota: Obesity; Type II Diabetes; Cardio Vascular Diseases; infection with Clostrodium difficile; Crohn's disease, Ulcerative Colitis and Irritable Bowel Syndrome (IBS) (bowel diseases), Asthma, Eczema, Liver disease, Colorectal Cancer.

"Bacterial DNA fragments can be found in the blood of patients suffering from cirrhosis and are representative of its severity."

"The role of gut bacteria in liver disease include the metabolic breakdown of alcohol into acetaldehyde which damages the gut and liver, and the bacterial migration from the gut to other organs."

"Different strategies exist to modulate the Gut-Liver axis: Antibiotics but the whole resistance problem arises, or Probiotics which have shown to reduce inflammation."

It is evident that the gut microbiota plays a large role in intestinal health and disease and therefore manipulation or modulation is a clinical option. According to a review by Walsh in 2014, this modulation of the gut microbiota could be achieved by:

1. Diet: the amount, type and balance of proteins, carbohydrates and fat have a profound impact on the gut microbiota.



From Walsh et al 2014. Beneficial Modulation of the gut microbiota.

2. Antimicrobials: research is ongoing as to choose the best characteristic of antibiotics and avoid strain resistance.
3. Probiotics
4. Faecal microbiota transplantation: 'It does what it says on the tin' - most commonly used to treat recurrent C.difficile infection but could be extended to IBD, IBS, obesity,..

What are Probiotics?

They are living microscopic organisms, also called micro-organisms. Most often they are bacteria (friendly bacteria), but they may also be other organisms such as yeasts. The World Health Organization (WHO) defines probiotics as "live micro-organisms which when administered in adequate amounts confer a health benefit on the host".

Each group of bacteria has different species and each species has different strains. This is important because different strains have different benefits for different parts of your body. For a list of these, please visit this website for info (no affiliation/sponsor, your clicks from there are your responsability and the subsequent info does not necessarily represent my views.)

"Strains of probiotics work differently and could be interchanged but we don't know if it would work because not all combinations have been tested scientifically so we generally stick to what the trial results have shown."

The most common probiotic bacteria come from two groups, sometimes mixed together: Lactobacillus and Bifidobacterium. Lactobacillus Casei Shirota is what's in Yakult.The name of the strain "Shirota" comes from Dr Shirota (Yakult's founder) who isolated this strain.

Note = Did you Know that Yakult is the universal language Esperanto translation of Yoghurt?

4 flavours of Yakult

For a probiotic to successfully exert its benefit on the host's gut microbiota it should be able to remain viable during storage and also be capable of surviving, and potentially colonizing the host's intestinal environment.

Studies on special mice have shown so far that a diet supplemented with probiotics are beneficial to treat/prevent obesity, type II Diabetes, liver damage, IBS, IBD, C. difficile infection.

"We tested a diet supplemented with 3 bottles of Yakult/day on 8 human patients who had severe liver damage with activated innate immunity response ie. abnormal levels of neutrophils (serve as a biomarker). After 4 weeks of supplemented diet, no patient experienced side effects and all showed normal blood levels of neutrophils... A new study is underway to see how long this effect lasts (on 92 patients; randomized, double blind, 6-months study)."

As a conclusion, I think it was quite extraordinary to learn about the amazing effects of these probiotics.
Now, of course, I'm not saying you should rush to the shop and buy Danone bifidus or Yakult.

What we know is that with our Western diet, our gut is highly susceptible to imbalance, and it wouldn't be stupid to take some probiotics once in a while, especially after a good night out ;).

If you are suffering from bowel disease or Diabetes, please do not take this as a medical advice, I am not "medically" trained, I'm just a scientist, so please do see your GP.

See you Soon for more Sexy Science,

References and further reading 
Pint Of Science - Dr Jane Macnaughtan
Everything You Always Wanted to Know About Probiotics

American Gastroenterological Association
http://www.ncbi.nlm.nih.gov/pubmed/24681100 - Kindly provided by future Dr Nirmesh Patel

http://www.ncbi.nlm.nih.gov/pubmed/20920376 

http://www.ncbi.nlm.nih.gov/pubmed/24583612