This Week in Science for Holistic Health
Welcome to This Week in Science for Holistic Health!
I scour the science news for interesting and relevant research for a holistic approach to health.
Food and Eating – More evidence that the highly processed, sugar-laden Western diet is associated with poor health. (I know, I know…) 🙂
Supplements – Certain probiotics can help increase iron absorption.
Disease Prevention – Despite being a popular recommendation, eating more frequently throughout the day does NOT reduce energy intake or improve weight status.
Anatomy & Physiology – We may actually NOT have 10x more microbiota in our gut than the number of cells in our body!
Food and Eating
Western diet induces a shift in microbiota composition enhancing susceptibility to Adherent-Invasive E. coli infection and intestinal inflammation.
NOTE: This is only a mouse study, but looked very interesting, so I included it
Evidence has demonstrated that in inflammatory bowel diseases (IBD), including Crohn’s disease (CD) and ulcerative colitis (UC), dysfunction of the immune response to gut microbiota occurs in context of host genetic predisposition. CD is a chronic and commonly disabling inflammatory disorder of the intestine, and its prevalence and incidence are increased in developed countries1. Because etiology of this disease remains poorly understood, no specific treatment is available. CD preferentially affects young adults and is a major public health problem because of its chronic and recurrent nature and growing prevalence.
Among factors associated with a Western lifestyle, changes in dietary habits should be investigated because escalating consumption of fat and sugar in Western countries parallels increased incidence of CD16,17. Western diet is enriched in total fat, animal proteins, n-6 polyunsaturated fatty acids and refined sugars, and it is considered as a predominant trigger implicated in development of IBD16.
Recent advances have shown that the abnormal inflammatory response observed in CD involves an interplay among intestinal microbiota, host genetics and environmental factors. The escalating consumption of fat and sugar in Western countries parallels an increased incidence of CD during the latter 20th century. The impact of a HF/HS diet in mice was evaluated for the gut micro-inflammation, intestinal microbiota composition, function and selection of an E. coli population. The HF/HS diet created a specific inflammatory environment in the gut, correlated with intestinal mucosa dysbiosis characterized by an overgrowth of pro-inflammatory Proteobacteria such as E. coli, a decrease in protective bacteria, and a significantly decreased of SCFA concentrations.
Western diet causes an inflammatory environment in the digestive tract associated with microbiome perturbations
Western diet favors the emergence of E. coli associated with the ileal, cecal and colonic mucosa
Western diet increases susceptibility to chemically-induced colitis
NOTE: This is based only on a mouse study
Here’s another reason to eat your vegetables. Trillions of microbes in the human large intestine—known as the microbiome—depend on dietary fiber to thrive and give us energy. As fiber intake declines, so, too, does the range of bacteria that can survive in the gut. Now, a new study of multiple generations of mice fed a low-fiber diet indicates that this diversity plummets further with each generation, a hint of what might be happening in the human gut as we continue eating a contemporary diet of refined foods. The work might also help explain rises in many Western diseases, such as inflammatory bowel disease and obesity.
In this review we summarize the epidemiological and clinical trial evidence evaluating added sugars, especially sugar-sweetened beverages, and the risk of obesity, diabetes, and cardiovascular disease and address potential biological mechanisms with an emphasis on fructose physiology. We also discuss strategies to reduce intake of fructose-containing beverages.
The more processed the oats, the higher the glycaemic response.
More evidence that highly processed sugary foods are assoc with poor health. (I know, I… Click To Tweet
Steel-cut oats (GI=55 (se 2·5)), large-flake oats (GI=53 (se 2·0)) and muesli and granola (GI=56 (se 1·7)) elicited low to medium glycaemic response. Quick-cooking oats and instant oatmeal produced significantly higher glycaemic response (GI=71 (se 2·7) and 75 (se 2·8), respectively) than did muesli and granola or large-flake oatmeal porridge. The analysis establishes that differences in processing protocols and cooking practices modify the glycaemic response to foods made with whole-grain oats. Smaller particle size and increased starch gelatinisation appear to increase the glycaemic response.
Folic acid supplementation was not associated with risk of major childhood cancers.
Collagen peptide supplementation in combination with resistance training improves body composition and increases muscle strength in elderly sarcopenic men: a randomised controlled trial
Protein supplementation in combination with resistance training may increase muscle mass and muscle strength in elderly subjects. The objective of this study was to assess the influence of post-exercise protein supplementation with collagen peptides v. placebo on muscle mass and muscle function following resistance training in elderly subjects with sarcopenia.
Our data demonstrate that compared with placebo, collagen peptide supplementation in combination with resistance training further improved body composition by increasing FFM [fat-free mass], muscle strength and the loss in FM [fat mass].
Probiotic strain Lactobacillus plantarum 299v increases iron absorption from an iron-supplemented fruit drink: a double-isotope cross-over single-blind study in women of reproductive age
Iron deficiency is common, especially among young women. Adding probiotics to foods could be one way to increase iron absorption. The aim of this study was to test the hypothesis that non-haem iron absorption from a fruit drink is improved by adding Lactobacillus plantarum 299v (Lp299v).
In conclusion, intake of probiotics can increase iron absorption by approximately 50 % from a fruit drink having an already relatively high iron bioavailability.
Effects of zinc supplementation on markers of insulin resistance and lipid profiles in women with polycystic ovary syndrome: a randomized, double-blind, placebo-controlled trial.
This study was conducted to evaluate the effects of zinc supplementation on glucose homeostasis parameters and lipid concentrations in PCOS women. We are aware of no study evaluating the effects of zinc supplementation on metabolic profiles of patients with polycystic ovary syndrome (PCOS).
Taken together, 220 mg zinc sulfate supplementation per day for 8 weeks among PCOS women had beneficial effects on metabolic profiles.
Studies suggest that a diet rich in omega-3 essential fatty acids may have beneficial anti-inflammatory effects for chronic conditions such as cystic fibrosis.
…review found that regular omega-3 supplements may provide some benefits for people with cystic fibrosis with relatively few adverse effects, although evidence is insufficient to draw firm conclusions or recommend routine use of these supplements in people with cystic fibrosis. This review has highlighted the lack of data for many outcomes meaningful to people with or making treatment decisions about cystic fibrosis.
Effect of Nutrients, Dietary Supplements and Vitamins on Cognition: a Systematic Review and Meta-Analysis of Randomized Controlled Trials.
Observational studies have suggested that various nutrients, dietary supplements, and vitamins may delay the onset of age-associated cognitive decline and dementia. We systematically reviewed recent randomized controlled trials investigating the effect of nutritional interventions on cognitive performance in older non-demented adults.
Omega-3 fatty acids, B vitamins, and vitamin E supplementation did not affect cognition in non-demented middle-aged and older adults. Other nutritional interventions require further evaluation before their use can be advocated for the prevention of age-associated cognitive decline and dementia.
Effects of a quercetin-rich onion skin extract on 24 h ambulatory blood pressure and endothelial function in overweight-to-obese patients with (pre-)hypertension: a randomised double-blinded placebo-controlled cross-over trial
In conclusion, supplementation with 162 mg/d quercetin from onion skin extract lowers ABP [ambulatory blood pressure] in patients with hypertension, suggesting a cardioprotective effect of quercetin. The mechanisms responsible for the BP-lowering effect remain unclear.
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Diseases/Conditions and Prevention/Treatments
Soy Isoflavones and Osteoporotic Bone Loss: A Review with an Emphasis on Modulation of Bone Remodeling
Osteoporosis is an age-related disorder that affects both women and men, although estrogen deficiency induced by menopause accelerates bone loss in older women. As the demographic shifts to a more aged population, a growing number of men and women will be afflicted with osteoporosis. Since the current drug therapies available have multiple side effects, including increased risk of developing certain types of cancer or complications, a search for potential nonpharmacologic alternative therapies for osteoporosis is of prime interest. Soy isoflavones (SI) have demonstrated potential bone-specific effects in a number of studies. This article provides a systematic review of studies on osteoporotic bone loss in relation to SI intake from diet or supplements to comprehensively explain how SI affect the modulation of bone remodeling.
In conclusion, the modern applications of SI are based on their estrogenic activities. SI have demonstrated their viable potential in decreasing bone resorption and enhancing formation. Studies using SI to preserve bone loss show more initial promise under in vitro and in vivo studies. However, further study is warranted to delineate the underlying mechanisms, efficacy, and safety of this compound, and especially, an investigation on the preventive effects of SI on typical human diet and potentials of dietary supplements is critically needed.
… Therefore, more well-designed human clinical trials are called for evaluating the effects of SI on osteoporosis in functional, symptomatic, structural, and biochemical outcomes to build the translation bridge between these endpoints.
Despite the global impact of these environmental changes, obesity appears to manifest preferentially in genetically predisposed individuals, and a high level of inter-individual variation has been observed among exposed populations6. Current evidence has shown that heritability estimates for obesity-related traits can be modulated by lifestyle factors such as physical activity (PA).
You can see in this chart that, while a persons genes does affect their BMI (see: TT, CT & CC), their physical activity level (PA) still makes an impact (higher physical activity, lower BMI).
Given the growing consensus that food intake may be the main driver of the obesity epidemic40, it is important to note that both PA measures displayed significant associations with both adiposity measures at baseline and at follow-up. This indicates that PA can influence obesity, despite the broad range of lifestyles among the participants. The value of PA for managing obesity has been recognized in a recent analysis of the National Health and Nutrition Examination Survey (NHANES) cohort from 1988–2010, which found that PA had a larger impact on BMI and waist circumference trends than calorie intake41. Our cross sectional analyses indicate that one hour of jogging or swimming (8.0 MET activities) per week was associated with approximately a 0.5 kg/m2 decrease in BMI. Together, these data challenge the idea of attributing the obesity epidemic mainly to excessive caloric intake40 and support the universal value of PA to maintain a healthy body weight41.
These findings suggest that obesity prevention programs emphasizing vigorous PA for genetically at risk subgroups may be a valuable contribution to the global fight against obesity.
Food Consumption and its Impact on Cardiovascular Disease: Importance of Solutions Focused on the Globalized Food System: A Report From the Workshop Convened by the World Heart Federation.
On the basis of the current evidence, the traditional Mediterranean-type diet, including plant foods and emphasis on plant protein sources provides a well-tested healthy dietary pattern to reduce CVD.
The Role of Probiotic Lactic Acid Bacteria and Bifidobacteria in the Prevention and Treatment of Inflammatory Bowel Disease and Other Related Diseases: A Systematic Review of Randomized Human Clinical Trials
Inflammatory bowel disease (IBD), which includes Crohn’s disease (CD) and ulcerative colitis (UC), is a chronic inflammation of the small intestine and colon caused by a dysregulated immune response to host intestinal microbiota in genetically susceptible subjects. A number of fermented dairy products contain lactic acid bacteria (LAB) and bifidobacteria, some of which have been characterized as probiotics that can modify the gut microbiota and may be beneficial for the treatment and the prevention of IBD.
The use of probiotics and/or synbiotics has positive effects in the treatment and maintenance of UC, whereas in CD clear effectiveness has only been shown for synbiotics. Furthermore, in other associated IBD pathologies, such as pouchitis and cholangitis, LAB and bifidobacteria probiotics can provide a benefit through the improvement of clinical symptoms. However, more studies are needed to understand their mechanisms of action and in this way to understand the effect of probiotics prior to their use as coadjuvants in the therapy and prevention of IBD conditions.
Eating Frequency, Food Intake, and Weight: A Systematic Review of Human and Animal Experimental Studies
Eating frequently during the day, or “grazing,” has been proposed to assist with managing food intake and weight.
One key area in obesity treatment is reducing energy intake (4). Ideally, the dietary prescription provided for reducing energy intake aids with appetite control, thereby enhancing ability to consume less energy, producing greater weight loss, and improving long-term weight loss maintenance. One dietary strategy that has long been proposed in the lay literature to improve appetite control and assist with weight management is increased eating frequency (EF) (i.e., eat small amounts of food every 2–3 h –“grazing”) (8, 9). However, while “grazing” is often suggested as a helpful strategy for managing hunger, the Dietary Guidelines Committee of 2010 stated that there is a lack of research in the area on EF and body weight and obesity, thus conclusions regarding an optimum EF prescription for weight management cannot be made and research on this topic is greatly needed (10). Therefore, within the scientific community there is agreement that the relationship between EF and management of food intake and weight is not clear (10).
The purpose of this systematic review was to provide a comprehensive review of experimental research conducted in both humans and animals in the areas of greater EF, food intake, and body weight. Twenty-five studies, using varying study designs, EF manipulations, and lengths of experimentation, were identified and included in the review (20–44). As a whole, the reviewed experimental studies provide little support that increasing EF influences intake or body weight.
The hypothesis that increased EF may influence energy intake and/or anthropometrics continues to be sustained in the literature.
The outcomes of this review show that more than half of studies found no significant difference in energy intake or anthropometrics in differing EF conditions.
In summary, the human and animal experimental studies included in this review suggest that greater EF may not necessarily influence energy intake or anthropometrics. This indicates that contrary to what is commonly proposed in the lay literature, eating more frequently during the day (i.e., “grazing”) may not assist with reducing energy intake or improving weight status.
The present study demonstrates that regular consumption of pistachio nuts not only improves glycemic and lipid parameters, but also results in improvements in vascular stiffness and endothelial function. Importantly, these improvements were seen in apparently healthy individuals and with a diet (including pistachios) and exercise regimen that every adult individual is expected to follow.
Impact of palm date consumption on microbiota growth and large intestinal health: a randomised, controlled, cross-over, human intervention study.
Our data indicate that consumption of date fruit may reduce colon cancer risk without inducing changes in the microbiota.
Cocoa flavanol intake improves endothelial function and Framingham Risk Score in healthy men and women: a randomised, controlled, double-masked trial: the Flaviola Health Study
Cocoa flavanol (CF) intake improves endothelial function in patients with cardiovascular risk factors and disease.
…flavanols are one of the few bioactives known today, for which causality between intake and an improvement in arterial function has been formally demonstrated
The observed cardiovascular benefits include the recovery of endothelial function, a decrease in blood pressure (BP) and improvements in lipids and insulin resistance.
A high-flavanol cocoa extract (Cocoapro®-processed cocoa extract; Mars Inc.) was the source of flavanols in the CF-containing drink.
Cocoa flavanol intake decreases blood pressure, vascular stiffness and cholesterol.
Our findings support the notion that CF intake has the potential to support the maintenance of cardiovascular health. Furthermore, our data add to the accumulating body of evidence regarding the health benefits of dietary flavanols and procyanidins in general, thus contributing to evidence-based assessments of potential future dietary guidelines for these bioactives.
Type and amount of dietary protein in the treatment of metabolic syndrome: a randomized controlled trial.
Metabolic syndrome (MetS)6 is characterized by a clustering of cardiovascular disease (CVD) risk factors, and as the number and severity of these increase, so does the risk of CVD, type II diabetes, and all-cause mortality (1, 2). Treatment of MetS includes weight loss to reduce abdominal obesity, a healthy dietary pattern, and regular physical activity (3).
This study compared 3 diets varying in type (animal compared with plant) and amount of protein on MetS [metabolic syndrome] criteria.
Weight loss was the primary modifier of MetS resolution in our study population regardless of protein source or amount. Our findings demonstrate that heart-healthy weight-loss dietary patterns that emphasize either animal or plant protein improve MetS criteria similarly.
We compared the effects of a very-low-carbohydrate, high-unsaturated fat, low-saturated fat (LC) diet with a high-carbohydrate, low-fat (HC) diet on glycemic control and cardiovascular disease risk factors in T2D after 52 wk.
Both diets achieved substantial weight loss and reduced HbA1c and fasting glucose. The LC diet, which was high in unsaturated fat and low in saturated fat, achieved greater improvements in the lipid profile, blood glucose stability, and reductions in diabetes medication requirements, suggesting an effective strategy for the optimization of T2D management.
Randomised clinical trial: gut microbiome biomarkers are associated with clinical response to a low FODMAP diet in children with the irritable bowel syndrome.
In childhood IBS, a low FODMAP diet decreases abdominal pain frequency. Gut microbiome biomarkers may be associated with low FODMAP diet efficacy.
Anatomy & Physiology
Scientists bust myth that our bodies have more bacteria than human cells: Decades-old assumption about microbiota revisited.
We may NOT have 10x more bacteria in our gut than cells in our body! #gut #microbiota #health… Click To Tweet
It’s often said that the bacteria and other microbes in our body outnumber our own cells by about ten to one. That’s a myth that should be forgotten, say researchers in Israel and Canada. The ratio between resident microbes and human cells is more likely to be one-to-one, they calculate.
The 10:1 myth persisted from a 1972 estimate by microbiologist Thomas Luckey, which was “elegantly performed, yet was probably never meant to be widely quoted decades later”, say the paper’s authors. In 2014, molecular biologist Judah Rosner at the US National Institutes of Health at Bethesda, expressed his doubts about the 10:1 claim, noting that there were very few good estimates for the numbers of human and microbial cells in the body.
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Inclusion Criteria for This Week in Science for Holistic Health posts:
- Studies must be published in a peer-reviewed medical journal or highly credible website (e.g. Cochrane.org) within the last few weeks,
- Articles must be relevant to a holistic approach to health (specifically nutrition & lifestyle factors),
- Studies were done on people unless noted otherwise (animal and tissue studies have unknown relevance to people),
- I also include new science-based books that look interesting (’cause I LOVE reading!).
- None of the above applies if it’s a response to something in the media. 😉
- P.S. – The titles are hyperlinked to the actual studies, so feel free to “geek out”. 🙂
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Have you picked up your copy of “How Not to Die”? I did, and I’m reading it now. I will post my review in the upcoming weeks. 🙂
I love the NutritionFacts.org site, it’s definitely one of my “go-to’s” when it comes to nutrition and health information
How Not to Die: Discover the Foods Scientifically Proven to Prevent and Reverse Disease by Michael Greger, MD
Part 1 includes chapters for “How not to die from:” heart/lung/brain, etc. diseases with almost 3,000 scientific references; Part 2 has Dr. Greger’s favourite recipes, kitchen gadgets, brands, etc.. I’m looking forward to reading this!
Watch the trailer here:
Buy the book here:
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Leesa Klich lives at the intersection of science and holistic health (it’s really, really interesting here!) 🙂 At NutritionInteractions she helps holistic-minded people taking medications maximize the benefits of good nutrition. She also helps holistic health professionals find and understand science-based health information. She has a Master of Science degree in Toxicology and Nutrition and is currently studying to be a Registered Holistic Nutritionist. For a list of free health resources, click here.
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