Thursday, October 9, 2025

Polaris of Enlightenment

Why you should have plants in your home

Published 13 October 2024
– By Editorial Staff
6 minute read

The right plants can significantly reduce harmful air pollutants. Additionally, their presence has been linked to lower stress levels and increased productivity.

The biophilia hypothesis proposes that humans have an inherent connection to nature, and as a result, experience comfort and well-being when immersed in it. A number of studies also show that spending time in nature can have major health benefits for us. For example, being close to nature at home tends to reduce the use of antidepressants and boost self-esteem. Studies also show that spending time in nature can positively change people’s perspective on time.

At the same time, there is also comfort for those who have difficulty getting to the forest. Studies suggest that even houseplants at home or work can have similar effects.

All plants produce oxygen and also absorb carbon dioxide. Some plants can also help purify the air and even improve humidity levels. As early as 1989, NASA was researching the effect of plants on the air in enclosed spaces as spacecraft are unable to ventilate away harmful substances. The study mainly used plants that do better in low-light environments, focusing on how plants can purify the toxic substances benzene, trichloroethylene and formaldehyde. The NASA study found that a lot of houseplants actually removed toxic substances from the air, at least partially.

Reducing stress

In a 2015 study, researchers wanted to look at the possible psychological and physiological health benefits of indoor plants. In this study, 24 young male participants were asked to either replant a houseplant or complete a brief computer-based task, after which their heart rate and blood pressure were measured. Participants who worked with the plants showed lower blood pressure and generally felt calmer compared to those who performed the computer task. In contrast, those who used the computer reported feeling more discomfort, and their blood pressure increased.

Even just looking at pictures of houseplants can have health benefits, according to another 2012 study. It exposed patients in a hospital waiting room to real plants, pictures of plants or no nature at all and compared the results. Both the real plants and the pictures of plants contributed to lower stress levels compared to having no nature at all in the waiting room.

Research also shows that houseplants can help people heal from injury or illness. An umbrella study found that hospitalized patients with a view of houseplants or trees were calmer and had better conditions for well-being compared to those without. They also typically required less pain medication and had shorter hospital stays than other patients.

Plants create happiness

Some research also suggests that houseplants can simply make you happier. For example, a 2013 study found that participants who spent five to ten minutes in a room with a few houseplants felt happier than those who were in a room without plants. Plants, or rather nature, are also generally thought to increase self-esteem and yet another study suggests that there is a very strong link between being close to nature and feeling happy.

Another study, published in 2019, found that green and purple plants in particular were effective in counteracting negative emotions.

Increases productivity

In a Korean study, primary school students were placed in classrooms with either a fake plant, a real plant, a photo of a plant, or no plant at all. Brain scans revealed that only the children exposed to a real plant showed significant improvements in attention and concentration. Similarly, a study from the Netherlands found that children in classrooms with a green plant wall performed better on tests of selective attention, which involves focusing on a specific task while filtering out distractions.

An older study from 1996 tried to implement potted plants in a windowless laboratory at a university. They found that, on average, students worked 12% faster if they had plants in the lab, compared to without. In another study, those working in a call center with a view of potted plants took 7% more calls compared to those without a plant view. Another study also tested implementing plants in three different offices in the UK and the Netherlands and found that those who had access to plants at their workplace were on average 15% more productive.

Air purifying plants

There are many plants that are claimed to purify the air of toxins, but some stand out in studies for their properties. If you’re in the market for a new houseplant but don’t know what to get, here are a few plants to consider.

Peace Lily (Spathiphyllum wallisii)

This plant is very common as a houseplant and should be easy to care for. It does not thrive in direct sunlight, but light, partial shade and even shade should be fine. It needs plenty of water and during the spring to fall you can also give nutrition once a month, but skip it during the winter.

Peace lilies are said to be one of the most air-purifying plants to have indoors. The NASA study found that it could reduce the toxic substance benzene by as much as 79.5% in just 24 hours. In the case of trichloroethylene, it reduced it by 23%, the highest reduction of any plant tested. It also removed 16,167 micrograms of formaldehyde in one day.

A 2022 study by researchers at the University of Birmingham tested three common houseplants, including the Peace Lily, to see if they could help remove air pollution in the home. All three plants were found to be effective against air pollution, removing around half of the nitrogen dioxide they were exposed to – in just one hour.

The Peace Lily is also said to be an effective humidifier as the leaves emit water vapor.

Peace Lily. Montage. Photo: Outi Marjaana, Elena Golovchenko/Pexels

Corn Plant (Dracaena fragrans)

Corn Plant is considered a shrub, or small tree. It thrives in semi-shade or shade and doesn’t need too much water, but the soil should be kept slightly moist. During winter it needs light, but does not like direct sunlight. Nutrition can be given once a month during winter

This plant was also included in the 2022 study, and is thus effective against air pollution, just like the Peace Lily. The NASA study also found that the plant was effective against formaldehyde

Corn Plant. Photo: feey/Unsplash

Ivy (Hedera helix)

The ivy does not like strong sunlight and likes to have a shower of water from time to time.

The leaves of the plant have long been used as a medicine for respiratory inflammations and are supposed to be expectorant. Today it is used as an active ingredient in medicines.

Ivy was also included in NASA’s study and proved to be the best of all plants at reducing benzene levels, by as much as 89.8% over 24 hours. In the case of trichloroethylene, it removed 10.9% over the same time. When eliminating formaldehyde, the plant reduced it by 9 653 micrograms over 24 hours.

Ivy. Photo: Jaunathan Gagnon/Unsplash

ZZ Plant (Zamioculcas zamiifolia)

ZZ Plant, also known as Eternity Plant, is hardy and can grow in both light and shade, but should not be placed in full sun. It will grow faster in a brighter position and the leaves will turn darker in a darker position. It’s good to allow the soil to dry out between waterings.

A 2013 study showed that the plant can effectively remove harmful substances such as benzene, toluene, ethylbenzene and xylenes (BTEX) from indoor environments. In another 2020 study, the plant was found to be particularly good at reducing concentrations of ethylbenzene. The researchers also saw positive effects when combined with other plants such as Sansevieria trifasciata to improve air purification of toluene and formaldehyde, among others.

This plant was also included in the previous study from 2022, and is thus effective against air pollutants.

ZZ Plant. Montage. Photo: WeFt, feey/CC BY-SA 3.0

True Aloe (Aloe vera)

Aloe vera thrives in well-drained soil, so it’s a good idea to put Leca balls in the bottom of the pot. It likes plenty of sun, but not too much water. Watering about twice a month is usually enough. Aloe vera is known for its many healing and health-giving properties, both internally and externally, but it is also said to be an excellent helper in purifying the air in the home.

True Aloe. Photo: Cecília O. Tommasini/Pexels

Two different review studies show that Aloe vera is effective in removing formaldehyde and benzene, but also xylenes. The plant was also included in the NASA study, which found that it could remove 1,555 micrograms of formaldehyde over 24 hours.

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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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