Rates of depression have been growing for some years, particularly among young adults. Treatment approaches are complex but new therapeutic perspectives are emerging around probiotics which are reportedly able to influence the central nervous system…
Throughout life, we are all destined to go through bad patches, characterised by sadness, apathy or melancholy, without actually suffering from depression. This is more commonly referred to as low mood.
Genuine depression is different - it is a recognised mental illness. To be diagnosed with depression, an individual will have typically suffered mood problems serious enough to cause significant disruption to social life and major personal suffering every day for at least two weeks, with at least four of the following accompanying symptoms:
In such problems, brain function is clearly disrupted: there are abnormalities in the production and function of neurotransmitters. This is particularly so with serotonin (zest for life), dopamine (pursuit of pleasure), GABA (‘switching off’) and noradrenaline (desire to move forward), all of which have a positive effect on mood.
That’s why doctors often prescribe drugs capable of rebalancing brain chemistry, particularly anti-depressants that can increase levels of these neurotransmitters (such as selective serotonin reuptake inhibitors (SSRIs) which block reuptake of the neurotransmitter by nerve cells, thus increasing the amount of available serotonin).
Probiotics are microorganisms present in certain fermented foods which have a beneficial effect on our gut microbiota, the huge collection of microbes that colonise our intestines. Unlike the bacteria that make up this microbiota, probiotics are not permanently implanted in the digestive tract. Their effects are thus temporary, but they are nonetheless indisputable: thousands of studies conducted over the past 20 years have demonstrated the contribution they make to the balance of the gut microbiota. In short, they drive out unwelcome pathogenic bacteria and encourage the return and proliferation of beneficial bacteria, the kind that have lived in symbiosis with mankind for thousands of years.
This rebalancing naturally has positive consequences for digestive function, but less predictably, it has been scientifically shown to have potential benefits for mental health too, especially mood. In fact, microorganisms in the gut are not only able to produce neurotransmitters identical in all respects to those produced in the brain, but they also transport them there via the vagus nerve which runs from the brain to the abdomen. This is how our microbes are thought to constantly interact with the brain, by exchanging various signals. Several strains of Lactobacilli and Bifidobacteria secrete GABA, while other bacterial species produce serotonin (1). Some studies have even shown that the use of probiotic strains capable of producing these neurotransmitters has a real effect on levels of these same neurotransmitters 50cm higher up, in the frontal cortex.
A second mechanism of action may explain the benefits of these specific probiotics, rechristened psychobiotics, on mood: their ability to indirectly normalise inflammation levels. How do they do this? By strengthening the intestinal barrier, thus making it harder for pathogenic bacteria to breach it (2) and ultimately, by reducing the number of inflammatory cytokines and harmful substances circulating in the body. Inflammatory markers are abnormally high in depressed individuals (3-5).
It’s worth noting that there are already synergistic formulations containing some of the probiotic strains discussed in the above-mentioned studies. The cutting-edge supplement Lactoxira has been specially formulated to reflect the latest discoveries relating to the gut-brain axis. It can be helpful in tackling episodes of the blues and negative mood, as can other, more classic supplements.
In terms of other supplements, omega-3 fatty acids (such as SuperSmart’s Super Omega 3), play a role in the fluidity of brain cell membranes and influence neurotransmitter levels. One form of omega-3, DHA, is thus recognised for helping to maintain healthy brain function (6).
The B group vitamins, especially folic acid, are also worth considering. They play an important role in the synthesis of mood-influencing neurotransmitters (including serotonin).
Last but not least, there’s 5-HTP, a popular serotonin precursor, typically extracted from the seeds of the African plant Griffonia simplicifolia.
Of course, if you’re considering taking supplements in the context of low mood or depression, you should feel free to consult a health professional first.
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