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Berries may lower blood pressure with help from gut bacteria

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Share on PinterestBerries can offer protection against a number of health conditions. Jovo Jovanovic / Stocksy

  • Red wine and fruits such as berries, apples and pears are rich in antioxidants, the flavonoids, which can protect against cardiovascular diseases, diabetes and cancer.
  • A new study found that people who consume the most flavonoids tend to have lower blood pressure.
  • The diversity and composition of the gut microbiota – the community of microorganisms that live in the gut – appears to play a role in the association between flavonoids and blood pressure.
  • This discovery could help explain why flavonoids have such different cardiovascular benefits for different people.

Nutritional advice from healthcare professionals can seem bleak and usually requires people to stay away from a list of goodies that scientists have found “bad” for health.

Important exceptions to this rule are foods and beverages rich in flavonoids, including dark chocolate, blueberries, and strawberries.

Research shows that flavonoids can protect against:

A new study now suggests that the bacteria that live in our gut, known as gut microbiota, may be partially responsible for the beneficial effects of dietary flavonoids on blood pressure.

High blood pressure is a major risk factor for cardiovascular disease, which is the leading cause of death in the United States.

Researchers at Queen’s University Belfast in Northern Ireland, UK, recently conducted a study that found that people who ate the foods richest in flavonoids tended to have lower blood pressure.

The participants’ gut microbiota diversity was responsible for a significant part of the association between flavonoids and blood pressure.

Specifically, the researchers’ analysis found that consuming 1.6 servings of berries per day – with one serving equivalent to a cup or 80 grams of berries – was associated with an average decrease in systolic blood pressure of 4.1 millimeters (mm Hg).

Systolic blood pressure is the pressure in a person’s arteries when the heart contracts, while diastolic blood pressure is the pressure when the heart relaxes. When measuring blood pressure, the first number is the systolic blood pressure and the second is the diastolic value.

Healthy blood pressure is usually below 120/80 mm Hg, while high blood pressure is typically 140/90 mm Hg or more.

The diversity and composition of the gut microbiota explains about 11.6% of the relationship between berry consumption and blood pressure.

Similarly, drinking 2.8 glasses of red wine per week (125 milliliters per glass) was associated with a 3.7 mm Hg decrease in systolic blood pressure. The gut microbiota accounted for 15.2% of this association.

“Consuming 1.5 servings of berries per day resulted in a clinically relevant lowering of systolic blood pressure,” said lead author Aedín Cassidy, Ph.D., professor of nutrition and preventive medicine at Queen’s University’s Institute for Global Food Security.

She told Medical News Today that a class of flavonoids called anthocyanins appears to be key to this effect.

Anthocyanins are the pigment molecules responsible for the red or blue color of many fruits, including red grapes, blueberries, black currants, and blackberries.

Previous research has found that gut bacteria break down flavonoids into compounds that have more powerful protective effects on the heart.

Conversely, regular consumption of flavonoid-rich foods also influences the composition of the intestinal microbiota.

“A better understanding of the highly individual variability of the flavonoid metabolism could very well explain why some people have greater benefits for cardiovascular protection from foods rich in flavonoid than others,” says Prof. Cassidy in a press release on the study.

The research appears in the journal Hypertension.

For their study, the researchers analyzed data from 904 adults between the ages of 25 and 82 who were part of a medical database in Germany called the PopGen-Biobank.

The team assessed participants’ flavonoid intake over the past year using a food questionnaire that assessed their consumption of 112 different foods.

To measure the diversity and composition of the participants’ gut microbiota, the scientists used a standard technique that involves sequencing the genetic material of bacteria in stool samples.

To get a consistent, reliable blood pressure reading from the volunteers, the researchers asked them to fast overnight. In the morning, participants rested for 5 minutes before the team took three consecutive blood pressure readings at 3-minute intervals.

In their analysis, the scientists used the average of the second and third measurements.

They considered a variety of other factors that could affect participants’ blood pressure, including gender, age, smoking status, medication use, physical activity, and a family history of coronary artery disease.

The study paper does not mention the race or ethnicity of the participants.

Higher consumption of berries, apples, pears, and red wine – all of which are high in flavonoids – have been linked to lower systolic, but not diastolic, blood pressure.

In addition, the participants who consumed the most flavonoids tended to have a greater variety of bacteria in their gut than those who consumed the least.

They also had a lower frequency of a genus of bacteria known as Parabacteroides and a higher frequency of species in the Ruminococcaceae family of bacteria.

Because fresh berries like strawberries, blackberries, and blueberries can be expensive, some people may find it difficult to eat them regularly.

However, Prof. Cassidy advised MNT that frozen berries that retain their anthocyanin content could be an inexpensive alternative.

She added that there is currently limited evidence that flavonoid supplements offer the same benefits as dietary flavonoids.

In the long term, according to Prof. Cassidy, scientists could produce prebiotic or probiotic foods that lower blood pressure by promoting the breakdown of flavonoids by intestinal bacteria.

“This research area is currently in its infancy, but once we have identified which beetles are needed to metabolize flavonoids in the gut and break them down into more bioactive forms, there is the potential to develop prebiotics or probiotics to do the Improve flavonoid metabolism, “she said.

Prof. Cassidy has received funding from the US Highbush Blueberry Council and is an advisor to the US Highbush Blueberry Council.

Tracy Parker, the British Heart Foundation’s senior nutritionist who was not involved in the research, welcomed the new results.

“However, everything is not yet clear to open a bottle of red wine,” she told MNT.

She pointed out that the increased risks of stroke and vascular dementia associated with drinking alcohol outweigh the potential benefits of drinking red wine.

“The best way to keep your blood pressure under control is to eat a balanced diet high in fruits and vegetables, exercise regularly, and maintain a healthy weight,” she concluded.

The authors point out some limitations to their study, including the fact that foods rich in flavonoid contain other health-promoting chemicals, such as resveratrol.

These chemicals can also help lower blood pressure.

Whole Grains Health

Protein Variety and Heart Health Are Linked, Study Finds

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We’ve all found ourselves in the habit of eating the same three things over and over (…and over) again. When life gets busy, falling back on simple dishes that satisfy your tastebuds is the natural thing to do. But if you’re cooking up the same couple proteins on the regular, a new study published in the the journal Hypertension suggests that it may be time to introduce a few new varieties into your breakfasts, lunches, and dinners.

The study pulled existing data from over 12,000 participants who took part in a minimum of two rounds of the China Health and Nutrition Survey. Researchers sought to explore the relationship between hypertension—or high blood pressure—and the variety and quantity of proteins from eight major dietary sources consumed by participants. (Study participants were an average age of 41 years old.)

Researchers measured protein intake by looking at three consecutive days of eating, scoring each round based on the number of protein varieties consumed (including legumes, fish, eggs, whole grains, refined grains, processed and unprocessed red meat, and poultry).

The results? “Among ‘just the right amount’ consumers of protein, those eating the greatest variety of protein had a the lowest blood pressure,” explains John Higgins, MD, a sports cardiologist with McGovern Medical School at the UT Health Science Center at Houston. Notably, those who ate the least and the most amount of protein were at the greatest risk for developing high blood pressure, while those who ate the greatest variety of protein were 66 percent less likely to end up developing hypertension between the rounds of the survey .

“The heart health message is that consuming a balanced diet with proteins from various different sources, rather than focusing on a single source of dietary protein, may help to prevent the development of high blood pressure.” — Xianhui Qin, MD, study author

Although the survey results sound complicated—and, hey, they were—the takeaway is simple: “The heart health message is that consuming a balanced diet with proteins from various different sources, rather than focusing on a single source of dietary protein, may help to prevent the development of high blood pressure,” Xianhui Qin, MD, the study author, said in a press release. In other words: Mix it up! Spin the protein wheel of fortune and try something new.

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If you’re not quite sure where to start with upping your protein game, Dr. Higgins recommends looking at your consumption on a daily basis. “The American Heart Association recommends eating no more than about 5.5 ounces of protein daily, about one to two servings, from healthy sources such as plants, seafood, low-fat or fat-free dairy products and some lean meats and poultry,” he says. “The best proteins are lean proteins including beans, soy or tofu, fish, skinless chicken, very lean meat, and low-fat dairy products. Avoid proteins that say ‘hydrogenated’ on label or contain high levels of trans fats or saturated fats. “

Of course, there’s always room in your eating plan for less nutritional proteins, too—just try to incorporate these lean sources when you can, and ask your doctor if you have questions about what dietary habits are right for your particular health status and family history .

A delicious way to eat more varied proteins? This delicious quiche recipe:

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Whole Grains Health

The 10 Best Diet Books in 2022

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Staff, Courtesy of Shalane Flanagan & Elyse Kopecky

The word “diet” has earned itself an undeniably negative reputation, often leading people to think of unsustainable restriction and unhealthy fads. However, if you’re looking to adjust your way of eating, whether you want to feel better, lose weight, or hit a new personal record, there are tons of great diet books out there that can help educate you on ways to improve your nutrition and get you feeling better than ever.

While the diets of the past have focused on restriction, newer ways of eating encouragement consuming more good-for-you foods to crowd out less healthy choices, leaving you feeling satisfied, not deprived. These diet books are also super educational, teaching you why you should eat certain foods, what they can do for your health, and the best ways to make them delicious. To help you on your nutrition journey, we’ve gathered the best diet books and healthy cookbooks available today.

Best Diet Books

    How to Choose a Diet Book

    If you’re looking to switch up your diet, the first thing you should ask yourself is why. What exactly do you want out of a diet?

    Second, consider your lifestyle. Do you need meals that are quick and easy? Do you like to take an hour or two to cook for yourself every night? How often can you grocery shop for fresh ingredients?

    Finally, consider whether you’re looking specifically for a cookbook or one that will provide you education on a particular way of eating without necessarily giving you recipes. While many cookbooks will have some content that discusses the origins of food and their nutritional benefits, these books are unlikely to go as in-depth regarding nutrition as less recipe-focused ones.

    How We Selected

    To find the best diet books among the many options on the market, we researched the most popular books available and considered their content, credibility, design, digestibility, and organization. We then looked at both expert reviews and more than 105,000 customer ratings, written by people who’ve bought these books on Amazon, to settle on the diet books you’ll find below.

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    1

    Best vegetarian

    How to Cook Everything Vegetarian

    Houghton Mifflin Harcourt

    This is a great all-around cookbook, but it’s an especially great buy if you’re trying to lay off meat. This book contains everything from specific meal recipes to instructions for steaming veggies, truly teaching you how to cook from start to finish. There are recipes for every meal, as well as snacks and desserts, and it includes instructions for so many different dishes you could easily cook from only this book for an entire year and not get bored.

    2

    Best for Longevity

    The Blue Zones Kitchen: 100 Recipes to Live to 100

    This cookbook highlights recipes from specific areas across the globe—called blue zones—where people live the longest. While some of their longevity surely comes from other lifestyle factors, there’s no discounting the role diet plays in their long-lasting health and wellbeing. These recipes not only focus on ingredients, but the ways in which foods are prepared and how that relates to their overall nutritional value.

    The goal of the book is to increase longevity and quality of life while creating delicious recipes that you’ll want to eat time and time again.

    3

    Best Mediterranean

    The Complete Mediterranean Cookbook

    The Mediterranean diet is consistently ranked as one of the healthiest diets in the world. It’s full of lean proteins, healthy fats, and tons of vegetables, providing a well-rounded, nutritious way of eating.

    This cookbook not only has 500 great Mediterranean recipes, but it also helps you learn which ingredients you should make staples in your grocery list. It also uses only ingredients that you can easily find at standard grocery stores, which makes the Mediterranean diet more accessible.

    4

    Best for Runners

    run fast eat slow

    You’ve probably heard the phrase “abs are made in the kitchen”—and to some degree, the same holds true for personal records. While nutritious food won’t necessarily knock 30 seconds off your mile time, it can help you fuel your workouts so you get the most out of your training.

    This book was designed by Olympian Shalane Flanagan and is packed with recipes designed to help runners fuel their toughest workouts and recover after. As a bonus, the recipes included in this book just so happen to be delicious, too.

    5

    Best Vegan

    The Complete Plant-Based Cookbook

    When first going vegan, it can be difficult to figure out how to make food that is both delicious and nutritious. This book has 500 recipes ranging from meals to snacks to desserts that use entirely plant-based ingredients. These recipes also offer alternate ingredient options, like eggs and dairy, which is great if you want to add more plant-based recipes into your diet, but aren’t ready to dive headfirst into veganism.

    6

    Best for a full reset

    The Whole30: The 30-Day Guide to Total Health and Food Freedom

    Houghton Mifflin Harcourt

    If you’ve been diet-hopping in hopes of finding a meal plan that can help you commit to a healthier lifestyle and enjoy some weight loss, Whole 30 is a great choice. It has you cut out sugar, grains, dairy, legumes, and some other specific foods for 30 days. The idea behind the diet is that it helps jumpstart weight loss while simultaneously getting you to reassess how you think about what you are eating to reach a place of freedom with your food.

    7

    Best for weight loss

    The Obesity Code – Unlocking the Secrets of Weight Loss

    If weight loss is your goal, and you have struggled to find lasting success, this book could be a game-changer. It dives into the science of weight loss, helping you understand hormones, insulin resistance, and other reasons for weight gain. The book recommends intermittent fasting and a low-carb diet, and guides you on how to do them correctly, efficiently, and in the long term.

    8th

    Best for Learning about Food

    How Not to Die: Discover the Foods Scientifically Proven to Prevent and Reverse Disease

    A lot of eating plans focus on what you should eliminate from your diet, but this book places more importance on what you should be adding to your diet and why.

    It discusses foods that are scientifically proven to help you live a longer, healthier life, and the many ways in which food can help prevent disease. It focuses on whole body health—including both mental and physical health—and teaches you to focus on more than just weight and physical appearance when it comes to your food.

    9

    Best for Anti-Dieters

    Not a Diet Book: Take Control. Gain Confidence. ChangeYourLife.

    The rise of anti-diet culture gave inspiration to this book, which helps you improve your relationship with food, tackle weight loss, and debunk fad diets to find a simple and easy way to lose weight and create habits that will keep the pounds from coming back. This book will help you build skills that enable you to live a happier, healthier life without focusing too closely on calories or numbers on a scale.

    10

    Best for fasting

    Complete Guide to Fasting

    Fasting has gained popularity over the last decade and can be a great way to boost your metabolism, clear your mind, and promote weight loss. There are, however, rules you should follow while fasting so that you improve your health rather than endangering it. This book will guide you through intermittent, alternate-day, and extended fasting to ensure you choose the style that will work best for you and do it correctly.


    Before joining Runner’s World as an Editor in 2019, Gabrielle Hondorp spent 6 years in running retail (she has tested top gear from shoes, to watches, to rain jackets which has expanded her expertise—and her closets); she specializes in health and wellness, and is an expert on running gear from head-to-toe.

    This content is created and maintained by a third party, and imported onto this page to help users provide their email addresses. You may be able to find more information about this and similar content at piano.io

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Eating different kinds of protein protects against hypertension: New study

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Despite all this talk that more Australians are toying with vegetarianism, and despite the endless drum-beating about red meat giving you cancer and a dodgy heart, we continue to have one of the world’s highest levels of meat consumption.

Analysis published in December found Australians eat about 95 kilograms of meat per capita every year. The global average is 35 kilograms.

The article, ‘The Evolution of Urban Australian Meat-Eating Practices’, argues our meat-eating habits are driven by a blocky culture, an association with social status, a perception that plant-based diets are inadequate and lame, and ignorance about cooking legumes and tofu.

On the other hand, the authors point to a survey that found almost 20 per cent of those sampled “identified as meat-reducers”.

Furthermore, the authors say, 87 percent “of the meat reducer segment reported consuming a meat-free dish as their main meal at least once a week”.

They point to another survey that found almost 20 per cent described themselves as “flexitarian”, which is cool.

But it may not translate to more lentils, nuts, whole grains, fish and dairy hitting the dinner table as new favorite sources of protein.

A new study found why we need variety

Chinese researchers found that “eating protein from a greater variety of sources is associated with a lower risk of developing high blood pressure”.

Good to know because blood pressure is literally out of control in Australia.

One in three adults – more than six million Australians – has high blood pressure.

Of those afflicted, only 32 per cent have their hypertension under control. That leaves about four million Australians as ticking time bombs.

In December, in the Medical Journal of Australia, Professor Alta Schutte, Professor of Cardiovascular Medicine at UNSW Sydney, called for a national taskforce to tackle the issue.

By improving the control of hypertension, the risks of coronary heart disease, dementia and cerebrovascular disease will be substantially reduced.

The Chinese study suggests changing your diet will go some way to solving the problem.

the study

“Nutrition may be an easily accessible and effective measure to fight against hypertension. Along with fat and carbohydrates, protein is one of the three basic macronutrients,” said study author Dr Xianhui Qin, of the National Clinical Research Center for Kidney Disease at Nanfang Hospital, Southern Medical University in Guangzhou, China.

The study authors analyzed health information for nearly 12,200 adults (average age 41), who had taken part in multiple rounds of the China Health and Nutrition Survey from 1997 to 2015.

Over three days in the same week, participants shared what they had eaten.

They were given a protein “variety score” based on the different sources of protein they’d eaten: whole grains, refined grains, processed red meat, unprocessed red meat, poultry, fish, egg and legumes.

One point was given for each source of protein, with a maximum variety score of 8. The researchers then evaluated the association for new onset hypertension in relation to the protein variety score.

New-onset hypertension was defined as blood pressure greater than or equal to 140 mm Hg/90 mm Hg, the use of blood pressure-lowering medicine, or self-reporting that a physician had diagnosed high blood pressure.

The average follow-up time was six years.

The results

More than 35 per cent of the participants developed new-onset high hypertension during the follow-up.

Compared to participants with the lowest variety score for protein intake (1), those with the highest variety score (4 or higher) had a 66 per cent lower risk of developing high blood pressure.

The amount of protein eaten was also a factor. Consumption was divided into five categories, from least to most intake.

The researchers found that “people who ate the least amount of total protein and those who ate most protein had the highest risk for new onset of hypertension”.

The researchers didn’t ask why a variety of proteins was more healthy. But nutritionists, doctors and health writers have banged on about it for years.

Lean red meat is high in quality protein but provides no fiber or healthy fats. Processed meats are high in saturated fats and salt and are the worst.

Fish is high in long-chain fatty acids, which are good for the brain. Lentils and whole grains are high in fibre.

Hand on heart, a bit of each during the week might stop you from carking it in the street. Which is just undignified and unmanly.

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