Restarting probiotic foods

So I am restarting probiotic foods. I suppose I had a bad start when I went all in and started consuming everything at once – yougurt, kefir, sourdough, yeast supplements, probiotic capsules. I was also fermenting apples, vegetables, plantains, trying to make my own chickpea tempeh. Home fermentation could go wrong at some point, also I think the supplements were a bad choice. Maybe taking saccharomyces boulardii for a week could improve gut microbiome, but taking the capsules everyday for several months I think for me led to SIBO (small intestinal bacterial overgrowth, in this case there was also yeast).

I think at first when I started eating goat yougurt and drinking homemade kefir, I felt better. I remember there were several days when I was helping put up posters for a missing person – the man was my close friend’s co-worker. He was last seen at a bar on a Friday night but never made it home. I didn’t personally know the guy, but since I was putting up the posters and was part of a Facebook search group, I’ve learned a lot of details about his girl friend, his parents. A week later his body was found in lake Ontario and it really got to me. I know that this tragic ending of a search for a missing person would be painful for anyone in the search group, but with depression I think such event further triggers a cascade of negative thoughts about your own life. I didn’t know the guy, I didn’t know his parents, nor his girl-friend. It was their loss, this was not about me, but anxiety and depression always find a way to relate events to your own personal issues. I remember feeling overwhelmed with anxiety and physical pain, as if it was me who let something bad happened and now I would be punished for it. I couldn’t let go of the fear of punishment for things that were happening in the world. There was a sense that I had to fix them. Maybe when I was younger I would imagine that I have these feelings because I am a morally better person, but now I know that no, feelings of guilt and fear of punishment is depression showing through.

That weekend coincidentally was also when my first batch of goat kefir was ready. The day when I tried the first cup of kefir, I had continued sense of guilt and fear. I felt guilty for trying to feel well when such tragic things were going on in the world. I have already been through a lot of cognitive behavioural therapy by that point, so logically I understood that I was not obliged to feel unwell or be responsible for the world,  but the feeling was still there. This was more than a year ago, but I do remember feeling more calm the next day after starting goat kefir and letting go of some of the guilt. It wasn’t a complete relief, but I remember  no longer feeling overwhelmed and on the verge of tears.

Studies on probiotics and mental health are inconclusive. “A recent article in Annals of General Psychiatry reviewed the currently available medical literature on using probiotics to treat anxiety and depression. The doctors identified 10 studies that were well done (in other words blinded and placebo-controlled), and looked at each study in depth. All of these studies had relatively small numbers of patients, ranging as from as few as 42 to as many as 124. The results of these studies were mixed; some suggested that there may be mild benefits of taking probiotics if you have anxiety or depression while other studies showed no benefit. Overall, the authors concluded “the clinical effects of probiotics on mental health have yet to be studied comprehensively.” 

Can probiotics help treat depression and anxiety?

Probably just adding kefir to your diet will not cure mental issues, but I do enjoy drinking it, the sour yet creamy taste. It is also a source of calcium and protein. A glass of kefir has less sugar than a glass of milk since the bacteria and yeast from kefir grains break down the milk sugar lactose and convert it into lactic acid. “The only sugar naturally present is milk is lactose (is a sugar composed of galactose and glucose subunits). Most microorganisms lack the enzyme lactase which is required to break lactose into its two component sugars, namely, glucose and galactose. Lactic acid bacteria which do have lactase readily break down lactose and use glucose as an energy source. Lactic acid bacteria, therefore, have a competitive advantage in milk; that is, they are able to out grow other bacteria which are unable to obtain glucose from lactose. Further, some lactic acid bacteria are able to convert galactose to glucose.” Therefore when we drink kefir, the bacteria had already used up glucose and galactose for energy and therefore we don’t get glucose from the drink. When humans drink milk, it contains the sugar lactose. We have a protein named lactase that is produced in our small intestine. Lactose is then broken down by lactase into galactose and glucose, which is then absorbed into bloodstream. Therefore drinking non-fermented milk raises blood sugar more than kefir.

Is it safe to make kefir at home?

The good news is that fermentation of warm milk by lactic acid bacteria reduces milk pH to less than 4.0 and in turn makes the environment unlivable for pathogenic bacteria. Most organisms grow best at pH near physiological pH of 6.8, and not in acidic environments. I assume it would be great though for microbes from Yellowstone National Park acidic pools. these pools are usually of temperature ranging from 65 to 90 degrees Celsius and contain high sulfur contents, either as hydrogen sulfide (H2S(g)) emitted as a volcanic gas, or as elemental sulfur crystals. Who lives there – thermoacidophiles, a unique group of bacteria that are a combination of acidophiles and thermophiles. Thermoacidophiles are characterized by their exclusive ability to live in both highly acidic environments and also high temperatures. The typical conditions these thermoacidophiles live under include pH at around 2 with temperatures ranging from 80 to 90 degrees Celsius.

I am not sure if thermoacidophiles  are likely to contaminate homemade kefir, but I do sterilize my jars by pouring boiling water over them. Then I let the jar cool, place the kefir grains in, pour in milk, and cover with a coffee filter. I ferment my kefir at room temperature for 24 hours. Kefir is a versatile food as it can be drank on its own, used for smoothies, used to make tvorog (quark), syrniki (fried quark pancakes), and oladyi (fritters). Easy breakfast recipe – in the evening combine kefir, sorghum flour, ground oatmeal, egg, salt, and avocado oil in a bowl and let it stand overnight in the fridge. In the morning preheat a frying pan and then use the dough for fritters. Consume with honey and yougurt on top.

Who inhabits kefir?

The kefir grains initiating the fermentation consist of a symbiotic culture of lactic acid bacteria and yeasts embedded in a matrix of proteins, lipids, and polysaccharides. The matrix is formed by microbial activity, with color ranging from white to creamy yellow. Grains can include lactic acid bacteria, acetic acid bacteria, and yeasts. During fermentation, changes in the composition of ingredients occur. Lactose, the sugar present in milk, is broken down mostly to lactic acid (25%) by the lactic acid bacteria, which results in acidification of the product. Propionibacteria further break down some of the lactic acid into propionic acid. Other substances that contribute to the flavor of kefir are pyruvic acid, acetic acid, diacetyl and acetoin (both of which contribute a “buttery” flavor), citric acid, acetaldehyde, and amino acids resulting from protein breakdown. The slow-acting yeasts, late in the fermentation process, break lactose down into ethanol and carbon dioxide. Usually ethanol concentrations are 0.2–0.3%, so kefir is not much of an alcoholic beverage.

Probiotic bacteria found in kefir products include: Lactobacillus acidophilus, Bifidobacterium bifidum, Streptococcus thermophilus, Lactobacillus delbrueckii subsp. bulgaricus, Lactobacillus helveticus, Lactobacillus kefiranofaciens, Lactococcus lactis, and Leuconostoc species. Lactobacilli in kefir may exist in concentrations varying from approximately 1 million to 1 billion colony-forming units per milliliter, and are the bacteria responsible for the synthesis of the polysaccharide kefiran. In addition to bacteria, kefir often contains strains of yeast that can metabolize lactose, such as Kluyveromyces marxianus, Kluyveromyces lactis, and Saccharomyces fragilis, as well as strains of yeast that do not metabolize lactose, including Saccharomyces cerevisiae, Torulaspora delbrueckii, and Kazachstania unispora.

Kefir is made by adding kefir grains to milk typically at a proportion of 2-5% grains-to-milk. The mixture is then placed in a corrosion-resistant container, such as a glass jar, and stored preferably in the dark to prevent degradation of light-sensitive vitamins.