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Author: Sima

Published on Leave a comment on Fluoridated Drinking Water and Pregnancy

For years there has been a debate about whether adding  fluoride to drinking water was a plus (less tooth decay) versus those who felt there were possible health problems from the fluoride.  Now the results of a Canadian study is raising serious concerns. The researchers followed 601 pregnant women from 6 cities in Canada, and found that pregnant women with higher levels of fluoride in their urine tended to have children with lower average IQs (which was measured at 3 or 4 years of age). As in the USA, some communities added fluoride to municipal drinking water, while others didn't.

The problem is that: "Fluoride crosses the placenta, and laboratory studies show that it accumulates in brain regions involved in learning and memory, and alters proteins and neurotransmitters in the central nervous system." Not good. This is why studies are being done.

The researchers concluded the study with these words: "In this prospective birth cohort study from 6 cities in Canada, higher levels of fluoride exposure during pregnancy were associated with lower IQ scores in children measured at age 3 to 4 years. These findings were observed at fluoride levels typically found in white North American women. This indicates the possible need to reduce fluoride intake during pregnancy." [Note: in this study, the effect appeared to be stronger in boys than girls.]

Just note that this was an observational study (found an association, not a definite cause), but other studies also find such an association. (One study conducted in Mexico found that higher prenatal fluoride exposure was linked to lower IQs in 4 to 6 year old children.) Of course more studies are needed.

But in the meantime, one can try to lower fluoride exposure (in water) during pregnancy. One way is to drink less black tea (has high levels of fluoride) and green tea (varying levels of fluoride). Also, if fluoride is added to tap water, to try to drink less of that and perhaps more unfluoridated bottled water that is in glass bottles (because plastic leaches, and has more microplastics in it).

From The Scientist: Fluoride Exposure During Pregnancy Linked to Lower IQ In Sons   ...continue reading "Fluoridated Drinking Water and Pregnancy"

Published on Leave a comment on Eating Foods Rich In Flavonoids Has Health Benefits

A new large study found that eating a flavonoid rich diet is associated with a lower risk of death. Flavonoids are compounds found in abundance in plant derived foods and beverages, such as fruits, vegetables, dark chocolate, tea, legumes, and red wine. The study followed about 56,000 people in Denmark for 23 years and found that eating higher levels of flavonoid rich foods was associated with a lower risk of death from any cause (all-cause mortality), heart disease (cardiovascular disease), and cancer.

The researchers found that there was an inverse relationship (the more one eats, the lower the risk of death), and that this relationship was strongest among cigarette smokers and people who consume high amounts of alcohol (more than 20 grams per day). Bottom line: Make sure your diet includes lots of fruits, vegetables, legumes, and dark chocolate (yes!).

By the way, while other studies do find a lower incidence of heart disease and cancer in people eating a diet rich in flavonoids, in this study they were not looking at who got the diseases, but looked at deaths. Therefore the following title is misleading. It should instead say "... protects against cancer and heart disease deaths..." From Science Daily: Flavonoid-rich diet protects against cancer and heart disease, study finds  ...continue reading "Eating Foods Rich In Flavonoids Has Health Benefits"

Published on Leave a comment on Microplastics Are Found Even In Arctic Snow

We love plastic, and use plastics in basically everything. However, with time and wear and tear, plastics are worn down, and little plastic microparticles are released into the air. These microplastics are less than 5 mm (millimeters) long - about the size of a sesame seed or less. Studies are finding them everywhere, including our drinking water, in seafood, all sorts of foods, the dust, and the air in our homes and workplaces. And of course microplastics wind up in our bodies (whether ingesting them through food and beverages, or breathing them in so that they go to the lungs). No one really knows what effects they have on human health, but studies are starting to find harms to animal health.

Well...  now there is another cause for concern. A new study finds more than expected amounts of microplastic particles in remote parts of the world (the Alps and Arctic!) where no one expected to find them in large amounts. The German researchers report that the main types of plastic microparticles they found were from varnish, rubber, polyethylene, and polyamide (nylon). The particles are transported through the atmosphere by winds and air currents. View it as air pollution. Bottom line: As humans continue to use more and more plastics, and more gets released into the air, this means we all will absorb more and more microplastics with still unknown impacts on health.  Ultimately we all will have to address this issue.

Excerpts from The Atlantic: A Worrisome Discovery in High Arctic Snowfall

In just the past decade, scientists have discovered that microplastics—defined as any plastic detritus that’s about the size of a sesame seed or smaller—are a major new pollutant, the spread of which we’re only now understanding. Microplastics are present in 94 percent of tap water in the United States, according to one study. They form as larger plastic items—toys, clothing, paint chips, car tires—get worn down and torn to shreds.  ...continue reading "Microplastics Are Found Even In Arctic Snow"

Published on Leave a comment on Are Home Births As Safe As Hospital Births?

Good news for those wondering if home births are as safe as hospital births. An international study says the answer is YES, for low-risk women who begin labor intending to give birth at home as compared to low-risk women intending to give birth in a hospital. Canadian researchers analyzed data from 14 international studies (including about 500,000 women planning on home births). A midwife was present at each birth. The risk of perinatal or neonatal death was not different when birth was intended at home or in hospital. The researchers defined perinatal death as stillbirth after labor starts through day 7 after birth. Neonatal death is defined as death after birth of a live baby from day 0 through day 28.

The researchers pointed out that the best outcomes are when birth attendants are integrated into the health care system, and there was a smooth transition from home to hospital when needed. In their analysis they included studies looking at births in England, Netherlands, Norway, Sweden, Iceland, Canada, USA, Japan, Australia, and New Zealand.

From Science Daily: Home births as safe as hospital births: International study suggests  ...continue reading "Are Home Births As Safe As Hospital Births?"

Published on Leave a comment on The Choline In Eggs Is Beneficial For the Brain

Back in 2015 and 2016 some studies found a link between taking medicines that are anticholinergic and cognitive decline and dementia. Some examples of non-prescription anticholinergic medications are Chlor-Trimeton, Benadryl, Tavist, and Dimetapp. During this time a person also contacted me to report that his relative, who had Down's syndrome, had once participated in a study where he received cholinergic therapy, with the result that during the study he functioned better neurologically.

Meanwhile, I read several studies of older people that supported the result of a higher intake of foods with choline and better neurological functioning (e.g. verbal and visual memory).

A recent large study of men over a 4 year period found an association between a  higher intake of foods with choline (dietary choline) and better performance on several cognitive tests and lower risk of dementia. The research, which was conducted in Finland, found that the relationship seemed especially strong for a type of choline called phosphatidylcholine. Eggs (specifically the egg yolks) are a primary dietary source of phosphatidylcholine, and indeed, in the study, higher egg intake was associated with better performance on several measures, including verbal fluency, as well as lower risk of dementia.

Choline is an essential nutrient, found in some foods. Its role in the body is complex, but one of its roles is to produce acetylcholine, an important neurotransmitter for memory, mood, muscle control, and other brain and nervous system functions (NIH choline fact sheet). On the other hand, anticholinergic medications block the action of the neurotransmitter acetylcholine (which is involved with learning and memory). Anticholinergic medications include many common drugs, such as some antihistamines, sleeping aids, tricyclic antidepressants, medications to control overactive bladder, and drugs to relieve the symptoms of Parkinson’s disease.

What should one do? First, make sure to eat some foods rich in choline, especially eggs. The researchers themselves say that "consuming an adequate amount of foods high in choline may be an easy, effective, and affordable way to maintain cognitive functioning". Good sources of choline are meat, dairy products, poultry, and eggs - and it appears that eggs (the egg yolks) are especially beneficial. Second, one should also try to avoid non-prescription and prescription medicines known to be anti-cholinergic. For example switch from allergy medicines diphenhydramine or chlorpheniramine (Chlor-Trimeton) to one that isn't anticholinergic. [See list.]

From Science Daily: Dietary choline associates with reduced risk of dementia  ...continue reading "The Choline In Eggs Is Beneficial For the Brain"

Published on Leave a comment on Are We Looking At Sunlight and Health the Wrong Way?

Are we looking at vitamin D and sunlight the wrong way? Back in 2016 I posted about the results of a long-running Swedish study that made me rethink everything I knew about sunlight and health. (The prevailing view of dermatologists at the time and now is: to always use sunscreen if going outdoors in order to lower the risk of skin cancer. In other words, that sunlight is always harmful.)

The Swedish study followed women for 20 years and found that: Women who had more sunlight exposure experienced a lower mortality rate than women who avoided sun exposure. However, they were at an increased risk of skin cancer. But those with more sun exposure lived longer due to a decrease in heart (cardiovascular) disease and other noncancer reasons. And the most surprising finding: Nonsmokers who avoided sun exposure had a similar life expectancy as smokers with the highest sun exposure. In other words: avoidance of sun exposure = cigarette smoking when looking at life expectancy. And the results of sun exposure was dose-dependent, with the more, the better for longer life expectancy.

The researchers suggested that  a person's vitamin D levels might be just a marker of sun exposure, which other studies and articles now also suggest. So while we measure vitamin D levels in studies, maybe we should instead be looking at sunlight exposure.

Since then I read more studies that found other benefits of sunlight exposure, such as sunlight having low levels of "blue light" which energizes T cells. T cells are a type of white blood cell, are part of the immune system, and help protect the body from infection and cellular abnormalities (cancer). An earlier study found that exposing skin to sunlight may help to reduce blood pressure and thus cut the risk of heart attack and stroke.

This year I read the following two nicely written articles about this whole issue, both a little different - so worth reading both to get a good idea about the research and the debate.

1) From Outside: Is Sunscreen the New Margarine?

2) From Elemental Medium: What If Avoiding the Sun Is Bad for You?

And once again, a link to the 20 year Swedish study, from the Journal of Internal Medicine: Avoidance of sun exposure as a risk factor for major causes of death: a competing risk analysis of the Melanoma in Southern Sweden cohort

Published on Leave a comment on Vitamin A and Skin Cancer Risk

A recent large study found that getting high levels of vitamin D from foods, but not supplements, is linked to a lower rate of a common skin cancer (squamous cell carcinoma) years later. Once again: the beneficial health effect is associated with eating real foods, but not supplements.

Researchers found an inverse relationship with vitamin A intake and squamous cell carcinoma - those that had the highest dietary intake of vitamin A had a 17 % reduction of the skin cancer during the next 26 years. The inverse associations were highest among those with moles and those who had sunburns during childhood or adolescence.

The high intake group had the vitamin A amount equivalent to one medium baked sweet potato or 2 large carrots each day. Most of their intake came from fruitsand vegetables. Vitamin A (retinoids) is important in keeping skin cells healthy, and retinoids are considered cancer protective (or anticancer) for several cancers.

What foods are high in vitamin A?  Plant-based sources of vitamin A (carotenoids, including lutein and lycopene) include orange and yellow fruits  and vegetables, such as sweet potatoes, carrots, butternut squash, pumpkin, apricots, cantaloupe, red peppers, tomatoes, as well as broccoli, spinach, and leafy dark vegetables. Animal based sources of vitamin A  (retinol) are dairy foods (milk, cheese, yogurt), eggs, some types of fish (e.g. herring), and beef liver. (More information at National Institutes of Health.)

From Futurity: CAN GETTING MORE VITAMIN A CUT SKIN CANCER RISK?  ...continue reading "Vitamin A and Skin Cancer Risk"

Published on Leave a comment on Children, Animals, and Gut Microbes

The evidence is growing. Another recent study found that exposure to dirt and animals in the first year of life is beneficial for development of a a rich and diverse gut microbiome - that is, for greater species "richness" as well as more beneficial microbes. This is linked to lower levels of allergies and asthma in children.

So don't worry about children being exposed to animal "germs" and getting dirty! Instead, consider the microbes as having health benefits, such as developing a "robust immune system". In summary, it now appears that in the first year of life the immune system needs lots of exposure to all sorts of microbes (e.g. from pets, animals, dirt)  to "train it" to develop normally.

The Ohio State University researchers compared 5 healthy rural Amish infants to 5 healthy non-Amish urban infants in Ohio, also found that all of the rural (Amish) children were breastfed, while 2 of the urban (non-Amish) children were only formula fed (some microbial differences there). The Amish households had farm animals (cattle, sheep, and/or horses) and pets (dogs and/or cats), while the non-Amish households had no contact with livestock, but did have a pet dog or cat. Just like in other studies, one pet doesn't seem to be enough - even more animal exposure in early childhood is best for the gut microbiome. [One study found a dose-dependent effect with exposure to 5 furry pets in early childhood was needed to prevent all allergies.]

Studies find that rural (Amish) children have a low incidence of allergies and asthma, while urban children have a high incidence of allergies and asthma. In this study, an example of microbial differences in the 2 groups of children was that Bifidobacterium bacteria were "enriched" in non-Amish (urban) infants, while Roseburia species were "enriched" in Amish (rural, farm-raised) infants. Similar gut microbe differences have been observed in other studies comparing rural and urban children, and both dietary differences (e.g. farm raised children eat lots of homegrown produce) and environmental differences (animal exposure) are thought to be responsible for the differences.

From Science Daily: Keeping livestock in the yard just might help your baby's immune system  ...continue reading "Children, Animals, and Gut Microbes"

Published on Leave a comment on Problems With Paleo Diet?

The Paleo diet has been around for years and yet it continues to be controversial. The debate is whether following the Paleo diet long-term has health benefits or not? Supporters of the Paleo (Paleolothic) diet say it promotes gut health and is good for gut microbes, but recent research findings are a strike against this claim. The Paleo diet is based on the hypothesis that humans have not adapted to eating products of agricultural farming such as grains, dairy products, or legumes (beans), as well as all processed foods, so they should be avoided. Instead it stresses eating meat, fish, eggs, nuts, (some) fruits, and vegetables.

So what were the new research findings?  Australian researchers found that people who had been on a Paleo diet for more than a year ate lower amounts of resistant starch, and so had a different bacteria profile in the gut - with lower levels of some beneficial species. They also had high levels of a biomarker in the blood (trimethylamine-n-oxide or TMAO) that is linked to heart disease.

The problem seems to be the lower intake of resistant starch - which is a carbohydrate that resists digestion in the small intestine and ferments in the large intestine. As the fibers ferment they act as a prebiotic and feed the beneficial bacteria in the gut. More than one type of resistant starch can be present in a single food. And what foods contain resistant starches? Precisely some foods avoided in the Paleo diet: grains, rice, beans, peas, lentils, plantains, and green bananas. A number of studies find health benefits (e.g. gut health) from eating foods with resistant starches.

From Medical Xpress: Heart disease biomarker linked to paleo diet

People who follow the paleo diet have twice the amount of a key blood biomarker linked closely to heart disease, the world's first major study examining the impact of the diet on gut bacteria has found.  ...continue reading "Problems With Paleo Diet?"

Published on Leave a comment on Excellent Reason To Eat Apples: The Bacteria

New research once again confirms that raw fruits and vegetables result in a person ingesting lots of microbes. Millions of bacteria. Which is considered beneficial for our gut microbiome! What's interesting in the latest study looking at bacteria in both conventionally and organically grown apples is that organic apples are a better source of bacteria - that their bacteria are more diverse, distinct, and balanced (when compared to conventionally grown apples).

The Austrian researchers (Wassermann et al) wrote in the Frontiers In Microbiology: "Our results suggest that we consume about 100 million bacterial cells with one apple. Although this amount was the same, the bacterial composition was significantly different in conventionally and organically produced apples."

Interestingly, there were a lot of beneficial Lactobacillus species in the organic apples, but not conventionally grown ones. The researchers thought that the diverse microbiome of organic apples probably limits or hampers harmful microbes (human pathogens). The researchers also wrote: "The described microbial patterns in organic apples resemble the impact of apple polyphenols on human health, which have not only been shown to alleviate allergic symptoms (Zuercher et al., 2010), but also to promote growth of Lactobacillus and Bifidobacterium in the human gut and to reduce abundance of food-borne pathogens."

Another bonus of eating organic apples is that it means avoiding pesticides that are routinely sprayed on conventional fruit. So eat away! Microbes, fiber, and nutrients all in one small fruit!

Fun fact: The researchers write that apples are the most consumed fruit world-wide. Excerpts from Science Daily: An apple carries about 100 million bacteria -- good luck washing them off  ...continue reading "Excellent Reason To Eat Apples: The Bacteria"