The Gary Null Show - 05.06.21

Treatment with Rhodiola mimics exercise to resist high-fat diet-induced muscle dysfunction

Central South University (China), April 30, 2021

 

According to news reporting out of Changsha, People’s Republic of China, research stated, “Muscle dysfunction is a complication of high-fat diet (HFD)-induced obesity that could be prevented by exercise, but patients did not get enough therapeutic efficacy from exercise due to multiple reasons.”

The news reporters obtained a quote from the research from Xiangya Hospital of Central South University: “To explore alternative or supplementary approaches to prevent or treat muscle dysfunction in individuals with obesity, we investigated the effects of Rhodiola on muscle dysfunction as exercise pills. SIRT1 might suppress atrogenes expression and improve mitochondrial quality control, which could be a therapeutic target stimulated by exercise and Rhodiola, but further mechanisms remain unclear. We verified the lipid metabolism disorders and skeletal muscle dysfunction in HFD feeding mice. Moreover, exercise and Rhodiola were used to intervene mice with a HFD. Our results showed that exercise and Rhodiola prevented muscle atrophy and dysfunction in obese mice and activating the SIRT1 pathway, while atrogenes were suppressed and mitochondrial quality control was improved. EX-527, SIRT1 inhibitor, was used to validate the essential role of SIRT1 in salidroside benefit.”

According to the news editors, the research concluded: “Results of cell culture experiment showed that salidroside alleviated high palmitate-induced atrophy and mitochondrial quality control impairments, but these improvements of salidroside were inhibited by EX-527 in C2C12 myotubes. Overall, Rhodiola mimics exercise that activates SIRT1 signaling leading to improvement of HFD-induced muscle dysfunction.”

 

 

Prenatal exposure to pesticides increases the risk of obesity in adolescence

First study to analyse the long-term effects of persistent organic pollutants on cardiometabolic risk in adolescents

Barcelona Institute for Global Health (Spain), May 3, 2021

Exposure before birth to persistent organic pollutants (POPs)-- organochlorine pesticides, industrial chemicals, etc.--may increase the risk in adolescence of metabolic disorders, such as obesity and high blood pressure. This was the main conclusion of a study by the Barcelona Institute for Global Health (ISGlobal), a research centre supported by the "la Caixa" Foundation. The study was based on data from nearly 400 children living in Menorca, who were followed from before birth until they reached 18 years of age. 

POPs are toxic, degradation-resistant chemicals that persist in the environment. Examples of such compounds are pesticides and organochlorine insecticides (DDT, etc.). POPs have adverse effects on both human health and the environment and their use is regulated globally.

Prenatal exposure to these substances has been associated with cardiometabolic risk factors in childhood, but there were previously no studies assessing whether such associations continue into adolescence, a developmental stage characterised by significant changes in the endocrine system and rapid increases in body mass.

The aim of this investigation, carried out within the framework of the INMA Project-Environment and Childhood, was to study the associations between prenatal exposure to POPs and body mass index (BMI) as well as other markers of cardiovascular risk in adolescence. Data from 379 children in Menorca was analysed. POP levels were measured in umbilical cord blood samples and the children were then seen periodically between the ages of 4 and 18 years. At these visits, BMI, body fat percentage and blood pressure were recorded as they grew. When the child reached 14 years of age, the scientists measured blood biomarkers of cardiometabolic risk (cholesterol, triglycerides, glucose, etc.).

The results of this study, published in the journal Environment International, suggest an association between prenatal POP exposure and a higher BMI in adolescence, particularly in the case of the fungicide hexachlorobenzene (HCB) and the insecticide compound dichloro-diphenyl-trichloroethane (DDT). 

Exposure to these two organochlorides--HCB and DDT¬--was also associated with higher blood pressure in childhood and adolescence and increased cardiometabolic risk at 14 years of age. 

ISGlobal researcher Núria Güil-Oumrait, the first author of the study, explains that "this is the first longitudinal study to analyse the relationship between persistent organic pollutants and cardiometabolic risk throughout childhood and adolescence. Our findings show that the association between these substances and infant BMI does persist into adolescence and that prenatal exposures are associated with the main risk factors for metabolic syndrome in adults, a condition that today affects one in four people worldwide.

With respect to the mechanisms that might explain this association, Güil-Oumrait points out that "it is thought that POPs may interact with hormone receptors or with the generation of free radicals, and the chief problem is that these pollutants accumulate in the fatty tissues of living organisms, where they can persist for years, even decades". 

Martine Vrijheid, study coordinator and head of the Childhood and Environment Programme at ISGlobal, highlights the fact that "some of these substances could be considered endocrine disruptors, that is, chemicals that interfere with hormonal regulation". In her view "more studies are needed in this field, especially focussing on childhood and adolescence, which are critical developmental stages characterised by particular vulnerability".

 

 

One cup of leafy green vegetables a day lowers risk of heart disease

Research has found that by eating just one cup of nitrate-rich vegetables each day people can significantly reduce their risk of heart disease.

Edith Cowan University (Australia), May 4, 2021

New Edith Cowan University (ECU) research has found that by eating just one cup of nitrate-rich vegetables each day people can significantly reduce their risk of heart disease.

The study investigated whether people who regularly ate higher quantities of nitrate-rich vegetables, such as leafy greens and beetroot, had lower blood pressure, and it also examined whether these same people were less likely to be diagnosed with heart disease many years later.

Cardiovascular diseases are the number one cause of death globally, taking around 17.9 million lives each year.

Researchers examined data from over 50,000 people residing in Denmark taking part in the Danish Diet, Cancer, and Health Study over a 23-year period. They found that people who consumed the most nitrate-rich vegetables had about a 2.5 mmHg lower systolic blood pressure and between 12 to 26 percent lower risk of heart disease.

Lead researcher Dr Catherine Bondonno from ECU's Institute for Nutrition Research said identifying diets to prevent heart disease was a priority.

"Our results have shown that by simply eating one cup of raw (or half a cup of cooked) nitrate-rich vegetables each day, people may be able to significantly reduce their risk of cardiovascular disease," Dr Bondonno said.

"The greatest reduction in risk was for peripheral artery disease (26 percent), a type of heart disease characterised by the narrowing of blood vessels of the legs, however we also found people had a lower risk of heart attacks, strokes and heart failure." 

Forget the supplements

The study found that the optimum amount of nitrate-rich vegetables was one cup a day and eating more than that didn't seem to give any additional benefits.

"People don't need to be taking supplements to boost their nitrate levels because the study showed that one cup of leafy green vegetables each day is enough to reap the benefits for heart disease," Dr Bondonno said.

"We did not see further benefits in people who ate higher levels of nitrate rich vegetables."

Smoothies are ok

Dr Bondonno said hacks such as including a cup of spinach in a banana or berry smoothie might be an easy way to top up our daily leafy greens.

"Blending leafy greens is fine, but don't juice them. Juicing vegetables removes the pulp and fibre," Dr Bondonno said.

The paper "Vegetable nitrate intake, blood pressure and incident cardiovascular disease: Danish Diet, Cancer, and Health Study" is published in the European Journal of Epidemiology. It is a collaboration between Edith Cowan University, the Danish Cancer Society and The University of Western Australia.

The research adds to growing evidence linking vegetables generally and leafy greens specifically with improved cardiovascular health and muscle strength. This evidence includes two recent ECU studies exploring cruciferous vegetables and blood vessel health and green leafy vegetables and muscle strength.

 

 

Mindfulness programs can boost children's mental health

 

University of Derby (UK), May 4, 2021

Mindfulness programs can improve the mental health of school-age children and help them to feel more optimistic, according to new research from the University of Derby and Derbyshire Educational Psychology Service.

More than 1,000 pupils aged between 9-12 years old across 25 schools in Derbyshire, received one 45-minute mindfulness session per week for nine weeks during the year-long project, which involved a collaboration between Dr. William Van Gordon, Associate Professor in Contemplative Psychology at the University, and Derbyshire Educational Psychology Service.

Mindfulness is an ancient meditation technique that involves focussing awareness on the present moment, as a means of fostering calm, wellbeing and insight. The weekly sessions involved activities such as practicing mindful breathing and paying attention to bodily sensations, as well as exercises intended to help cultivate attention skills and a greater awareness of emotions.

The impact of the sessions, which were delivered by teachers in a traditional classroom environment, was evaluated by comparing psychological assessments that the children completed before the classes began, with assessments undertaken after the program had concluded. Part of the evaluation measured children's emotional resiliency using The Resiliency Scale for Children, while wellbeing was rated using the Stirling Children's Wellbeing Scale.

Overall, the study found a significant improvement in positive emotional state, outlook and resiliency. There was also an increase in the different dimensions of resilience: optimism increased by 10%, tolerance was improved by 8% and self-efficacy, how a child feels they can cope with a situation based on the skills they have and the circumstances they face, improved by 11%.

Professor Van Gordon said: "Findings from the study indicate that mindfulness delivered by school teachers can improve wellbeing and resiliency in children and young people.

"This is consistent with wider evidence demonstrating the positive impact of mindfulness on school children's levels of emotional resiliency, emotional stability, wellbeing and stress.

"These findings are also in line with the view that preventative interventions given at a young age can help to reduce the incidence of mental health problems in young people."

 

Vitamin D levels higher in exercisers

Johns Hopkins University, May 01 2021 

The issue of the Journal of Clinical Endocrinology & Metabolism published the finding of researchers at Johns Hopkins University of a correlation between increased physical activity and higher levels of vitamin D. Higher levels of vitamin D and exercise was also associated with a lower risk of cardiovascular disease.

The study included 10,342 men and women who were free of coronary heart disease and heart failure upon enrollment in the Atherosclerosis Risk in Communities study. Physical activity levels were assessed during follow-up visits that took place over a 19.3-year period. Stored serum samples obtained at the second visit were analyzed for 25-hydroxyvitamin D3.

Subjects who achieved American Heart Association recommended physical activity levels had average levels of vitamin D that were higher than those who had intermediate and poor levels of activity. Following adjustment for lifestyle and other factors, those who met the recommended levels had a 31% lower risk of being deficient in vitamin D than those with poor activity levels. Subjects in the recommended activity group with levels of vitamin D of 30 ng/mL or more had a 24% lower risk of cardiovascular disease.

The association between exercise and vitamin D was stronger in subjects of European ethnicity than among African Americans. The authors noted that European-Americans as well as those who engage in exercise are likelier to be supplement users. “We did find that vitamin D supplement use was higher among those with increased physical activity,” they observed.

"In our study, both failure to meet the recommended physical activity levels and having vitamin D deficiency were very common" stated coauthor Erin Michos, MD, MS, of Johns Hopkins University School of Medicine. "The bottom line is we need to encourage people to move more in the name of heart health."

 

 

One teaspoon daily of trehalose can help maintain glucose homeostasis: a double-blind, randomized controlled trial 

Hayashibara Co. Ltd (Japan), April 24, 2021

Background

Trehalose is a natural disaccharide that is widely distributed. A previous study has shown that daily consumption of 10 g of trehalose improves glucose tolerance in individuals with signs of metabolic syndrome. In the present study, we determined whether a lower dose (3.3 g/day) of trehalose improves glucose tolerance in healthy Japanese volunteers.

Methods

This was a randomized, double-blind, placebo-controlled study of healthy Japanese participants (n = 50). Each consumed 3.3 g of trehalose (n = 25) or sucrose (n = 25) daily for 78 days. Their body compositions were assessed following 0, 4, 8, and 12 weeks; and serum biochemical parameters were assayed and oral 75-g glucose tolerance tests were performed at baseline and after 12 weeks.

Results

There were similar changes in body composition and serum biochemistry consistent with established seasonal variations in both groups, but there were no differences in any of these parameters between the two groups. However, whereas after 12 weeks of sucrose consumption, the plasma glucose concentration 2 h after a 75-g glucose load was significantly higher than the fasting concentration, after 12 weeks of trehalose consumption the fasting and 2-h plasma glucose concentrations were similar. Furthermore, an analysis of the participants with relatively high postprandial blood glucose showed that the plasma glucose concentration 2 h after a 75-g glucose load was significantly lower in the trehalose group than in the sucrose group.

Conclusions

Our findings suggest that trehalose helps lower postprandial blood glucose in healthy humans with higher postprandial glucose levels within the normal range, and may therefore contribute to the prevention of pathologies that are predisposed to by postprandial hyperglycemia,, even if the daily intake of trehalose is only 3.3 g, an amount that is easily incorporated into a meal.

 

 

Coffee compound enhances autophagy to protect against cell injury

Chengdu University of Traditional Chinese Medicine (China), April 30, 2021

According to news reporting originating from Sichuan, People’s Republic of China, research stated, “Autophagy serves an important role in amyloid-beta (A beta) metabolism and tau processing and clearance in Alzheimer’s disease. The progression of A beta plaque accumulation and hyperphosphorylation of tau proteins are enhanced by oxidative stress.”

Our news editors obtained a quote from the research from the Chengdu University of Traditional Chinese Medicine, “A hydrogen peroxide (H2O2) injury cell model was established using SH-SY5Y cells. Cells were randomly divided into normal, H2O2 and chlorogenic acid (5-caffeoylquinic acid; CGA) groups. The influence of CGA on cell viability was evaluated using a Cell Counting Kit-8 assay and cell death was assessed using Hoechst 33342 nuclear staining. Autophagy induction and fusion of autophagic vacuoles assays were performed using monodansylcadaverine staining. Additionally, SH-SY5Y cells expressing Ad-mCherry-green fluorescent protein-LC3B were established to detect autophagic flow. LysoTracker Red staining was used to evaluate lysosome function and LysoSensor ™ Green staining assays were used to assess lysosomal acidification. The results demonstrated that CGA decreased the apoptosis rate, increased cell viability and improved cell morphology in H2O2-treated SH-SY5Y cells. Furthermore, CGA alleviated the accumulation of autophagic vacuoles, reduced the LC3BII/I ratio and decreased P62 levels, resulting in increased autophagic flux. Additionally, CGA upregulated lysosome acidity and increased the expression levels of cathepsin D. Importantly, these effects of CGA on H2O2-treated SH-SY5Y cells were mediated via the mTOR-transcription factor EB signaling pathway.”

According to the news editors, the research concluded: “These results indicated that CGA protected cells against H2O2-induced oxidative damage via the upregulation of autophagosomes, which promoted autophagocytic degradation and increased autophagic flux.”

This research has been peer-reviewed.