Thursday, October 9, 2025

Polaris of Enlightenment

Study: Kombucha tea can lower blood sugar levels

Published 15 October 2023
– By Editorial Staff
Kombucha is made with a so-called "Scoby", a type of mushroom.
2 minute read

Drinking kombucha tea may help lower blood sugar levels in individuals with type 2 diabetes, a new study suggests. After consuming the fermented beverage for four weeks, participants’ fasting blood sugar levels decreased to a healthy level.

Kombucha is a fermented tea made with the kombucha fungus, also known as Scoby (Symbiotic Culture of Bacteria and Yeast). The tea is rich in beneficial bacteria and is often considered a health drink. The drink is believed to have originated in northern China, mentioned as early as around 220 BC.

In a recent study, researchers wanted to investigate the beverage’s potential positive impact on individuals with type 2 diabetes, as previous studies have shown the drink can lower blood sugar levels. This is the first study examining kombucha’s effects on diabetic individuals, says one of the study’s co-authors, Dan Merenstein, a professor of family medicine at Georgetown University in Washington.

Some laboratory and rodent studies of kombucha have shown promise and one small study in people without diabetes showed kombucha lowered blood sugar, but to our knowledge this is the first clinical trial examining effects of kombucha in people with diabetes, he states.

Significant decrease

In the pilot study, published in Frontiers in Nutrition, a group of 12 individuals with type 2 diabetes consumed about 8 ounces of kombucha or a placebo drink daily. After a two-month period, the kombucha and placebo were swapped between groups to “wash out” the biological effects of the beverages. The participants then drank kombucha daily for another four weeks. None of the groups knew which drink they received during this period.

After the four weeks, the average fasting blood sugar levels decreased from 164 to 116 milligrams per deciliter, whereas the placebo drink did not yield any statistically significant reductions. According to the American Diabetes Association, pre-meal blood sugar levels should be around 70 to 130 mg/dl.

We were able to provide preliminary evidence that a common drink could have an effect on diabetes. We hope that a much larger trial, using the lessons we learned in this trial, could be undertaken to give a more definitive answer to the effectiveness of kombucha in reducing blood glucose levels, and hence prevent or help treat type 2 diabetes, says another co-author, Dr. Chagai Mendelson.

Beneficial microorganisms

The researchers also examined the composition of fermenting microorganisms in kombucha to determine which ingredients might be the most active. They found the drink primarily contained lactic acid bacteria, acetic acid bacteria, and a form of yeast known as Dekkera. Although the composition can vary depending on the drink and its maker, the researchers believe these bacteria are likely present in most kombucha beverages.

Type 2 diabetes is a growing public health concern in countries like Sweden and the USA. Many individuals are also in a so-called “pre-stage,” at risk of developing the disease. Therefore, the researchers believe this study holds promise for the future.

– Much more research is needed, but this is very promising, Professor Merenstein concludes.

Make Your Own Kombucha

To obtain a kombucha culture (Scoby) and a starter liquid, one can search in places like Facebook groups. Starter kits are also available for purchase online.

Ingredients

  • 2 liters of water
  • 1 1/2 tablespoons of black or green tea
  • 2 cups of granulated sugar
  • 2 cups of kombucha
  • 1 kombucha culture (Scoby)

Instructions

  1. Bring half of the water to a boil and add the tea. Remove from heat and stir in the sugar. Cover and let steep for approximately 30 minutes. Then strain out the tea leaves/bags.
  2. Pour the liquid into a clean glass jar that can hold at least three liters. Add the remaining water to the jar and cover with a thin cloth. Allow the water to cool completely. If it's too hot when adding the Scoby, it could perish.
  3. Once cooled, pour in the kombucha and place the Scoby on top of the liquid. Cover with a cloth and secure with a rubber band. Allow it to sit for one to two weeks at room temperature.
  4. Once done, save the Scoby and some kombucha to use for future batches.

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Study: Diet crucial against obesity – not activity level

Published 6 October 2025
– By Editorial Staff
The problem is not a sedentary lifestyle – but too much and the wrong kind of food, according to the researchers.
2 minute read

Sedentary and physically active people can burn almost the same amount of energy per day, shows a new American study. The researchers therefore argue that the fight against obesity must focus more on diet – and less on exercise.

In the study, published in the scientific journal PNAS, researchers compared data from 4,200 people from different continents with different lifestyles – including herding cultures in Siberia, hunter-gatherers in Tanzania, as well as people from both low-income and high-income countries. In total, they compared 34 different population groups.

The results show that total daily energy expenditure did not differ significantly between the different population groups. This means that, for example, a hunter-gatherer used the same amount of energy as an office worker in Sweden during a day.

Even when people live different lifestyles, once we account for the effects of body size, we do not see meaningful differences in the total number of calories people burn, says Amanda McGrosky at Elon University in the US, who is the lead author of the study, in a press release.

McGrosky points out that obesity is therefore primarily about increased calorie consumption, not decreased activity expenditure.

If you are worried about excess body fat, focus on calories in, not calories out, the researcher suggests.

Westerners eat too much

Obesity and overweight are growing health problems in the Western world, something often linked to the increasingly sedentary culture. However, this study suggests that sedentary behavior is not the biggest problem causing obesity, and McGrosky believes the study offers hope in the fight against obesity. Instead, one should look at diet and especially reduce the intake of ultra-processed foods and increase the proportion of healthy ones.

The researchers therefore suggest that it is not sedentary behavior that is the culprit in Western countries’ obesity epidemic, but rather that people simply eat too much and too unhealthily.

Exercise is still important

However, the researchers point out that this does not mean one should exclude exercise and movement, as it has a range of health-promoting benefits such as reduced risk of cardiovascular disease, premature death, and also improves mental health.

A key takeaway from the study is that increases in body fat that accompany changes in lifestyle are primarily linked to changes in energy intake, or diet. Physical activity is still very important for all-around health and should be considered complementary to diet, says McGrosky.

Fifteen minutes in the park can reduce anxiety

Published 26 September 2025
– By Editorial Staff
All types of green spaces in cities improve residents' mental health, but urban forests stand out – particularly when it comes to reducing depression and anxiety.
2 minute read

Just fifteen minutes in urban green spaces is enough to improve mental health, a study shows. The best approach is to sit or rest in the park for a while.

Today, approximately 55 percent of the world’s population lives in cities, according to the UN. This figure is expected to increase to nearly 70 percent by 2050. This means a greater absence of nature and also more health problems linked to city life, such as anxiety, which is more common among urban dwellers.

In a study by researchers at Stanford University in the US and Leiden University in the Netherlands, results from 449 published studies were compiled and 78 field experiments analyzed to examine how different types of urban green spaces affect 12 different aspects of mental health. Nearly 5,900 participants were included in total.

The results, published in Nature, show that all types of urban green spaces improved mental health, but urban forests stood out – particularly when it came to reducing depression and anxiety. And you didn’t need to spend particularly long to get a positive effect; less than fifteen minutes was enough. However, spending more than 45 minutes in nature provided greater benefits.

Our results show that even brief contact with nature can provide significant mental benefits, says Roy Remme from Leiden University, according to Medical Xpress. What’s more, longer nature exposure is linked to even greater reductions in stress and boosts in vitality.

Rest or sit

Young adults see even greater benefits, which is remarkable considering that most mental health problems begin before age 25. However, there was also a significant benefit for other age groups. Primarily, it was beneficial for mental health to sit or rest in the park or natural area, while moving around in nature increased energy and positivity.

Based on the results, the researchers emphasize the importance of protecting forests and parks in cities, but also promoting smaller parks and more street trees to improve residents’ access to nature. Furthermore, they point out that simpler changes, such as placing more windows facing greenery or organizing community programs with guided meditation, for example, can be cost-effective ways to promote public health.

Researchers: More people affected by meat allergy as ticks spread

Published 25 September 2025
– By Editorial Staff
Meat allergy can be triggered by tick bites – the immune reaction against alpha-gal in mammalian meat causes the symptoms.
2 minute read

Meat allergy is becoming increasingly common in Sweden following tick bites, researchers confirm. For those affected, it means a complete lifestyle change since there is no treatment – only complete abstinence from meat helps.

Karin Ottosson was struck by severe stomach problems after a tick bite. It took time to figure out what problem Karin had been affected by, she felt very ill and nothing seemed to help.

I was bedridden and tried to eat, but it just continued and continued, she tells Swedish media outlet TV4.

After several hospital visits and numerous investigations, the answer came: Karin had been affected by meat allergy. It is caused by an immune reaction to the substance alpha-gal, which is found in tick saliva and in meat from mammals. The symptoms can include, in addition to various stomach problems such as vomiting and diarrhea, rashes and even asthma reactions.

Researchers have seen a marked increase in meat allergy in connection with ticks spreading to new areas, and also becoming more active for larger parts of the year.

No treatment

Karin had to completely change her diet, but it is not entirely simple to avoid meat – even small amounts or hidden additives can trigger the allergy.

It can be anything from starting to itch, getting a rash, to becoming as ill as I was from the beginning. It’s impossible to predict, says Karin.

There is no treatment for meat allergy, and the only thing that works is to completely avoid meat.

Unfortunately, there is no treatment other than having to avoid mammalian meat and making sure not to get bitten by ticks, says Marianne van Hage, professor of clinical immunology.

Broccoli may protect against colorectal cancer

Published 15 September 2025
– By Editorial Staff
Delicious on the plate and delicious for your health.
2 minute read

People who eat more broccoli and cauliflower have a lower risk of colorectal cancer, according to a Chinese study. However, moderate amounts are sufficient to achieve the protective effect.

Colorectal cancer is the third most common form of cancer worldwide and is also the second leading cause of cancer-related deaths.

In Sweden, colorectal cancer has increased among young people over the past thirty years, and mortality from this form of cancer has increased among patients in all age groups for up to ten years after cancer diagnosis.

In the study, which was published in BMC Gastroenterology, researchers analyzed data from 17 previous studies, with a total of 639,539 participants, including 97,595 cases of colorectal cancer.

The purpose was to investigate whether higher vegetable intake corresponded to greater risk reduction for this form of cancer and, if so, the specific amounts at which this effect became significant.

The results showed that those who ate more cruciferous vegetables, such as broccoli, cabbage, cauliflower, or Brussels sprouts, had a 20 percent lower risk of colorectal cancer compared to those who ate less.

Photo: Polina Tankilevitch/Pexels

Glucosinolates

These vegetables contain many beneficial substances such as vitamins, fiber, and antioxidants. But what makes them extra special are compounds called glucosinolates. When you chew these vegetables, glucosinolates break down into other compounds called isothiocyanates – particularly one called sulforaphane.

These are the compounds that give the vegetables their strong, sometimes slightly bitter taste and smell. These are also the compounds believed to be cancer-preventive.

The researchers found that the greatest risk reduction was observed between 20 and 40 grams, but no significant improvement was seen above 40 grams per day.

The study was conducted at the Second Clinical Medical School of Inner Mongolia University for the Nationalities in Yakeshi, China.

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