Researchers Make Vegan Yogurt Using Lactic Acid Bacteria from Plants

Dominic Cuthbert wrote . . . . . . . . .

A lactic acid bacteria from Danish plants can be used to make entirely vegan ‘yogurt’ with just three ingredients, researchers have discovered.

Traditional yoghurt is made with cow’s milk and a starter culture that consists of different lactic acid bacteria. At the appropriate temperature, the starter culture begins to break down the sugar in the milk, thereby fermenting the milk and turning it into the thickened, soured product.

An increasing global demand for plant-based alternatives to traditional milk products has led researchers at the National Food Institute, Technical University of Denmark (DTU), to create a plant-based ‘yogurt’ with as few ingredients as possible.

There are already commercially available plant-based ‘yogurt’ products on the market, which are made with existing starter cultures that were developed for use in milk-based products. In order for the bacteria to grow enough to turn the plant-based products sour and give them a nice aroma, producers have to add sugar.

In addition to the added sugar, the producers use other ingredients to give their products the desired consistency and taste, which results in a longer list of ingredients. The vegan ‘yogurt’ is made with just three ingredients: Soy beverage, spent grain and a plant-based starter culture.

The researchers had a working hypothesis that using bacteria from the plant kingdom would be most efficient when fermenting a vegetable product such as a soy beverage given that these bacteria are optimised to break down sugar in plant material.

Researchers and students searched through fields and forests in large parts of Denmark in order to collect samples of different plant materials. They then examined the samples in the laboratory to see if they contained lactic acid bacteria with the properties that make the bacteria suitable as a starter culture in a plant-based ‘yogurt’.

Through the research-based teaching, the researchers at the National Food Institute have managed to isolate bacterial strains that can acidify a soy beverage and create a texture that is reminiscent of a traditional yogurt.

The researchers have managed to incorporate spent grain – a side stream from the production of beer – in the production of the ’yogurt’. This third ingredient make the resulting product more sustainable and increases its fibre content.

Depending on how much spent grain is used in the production of the ‘yogurt’, it can also give the final product an aroma, which can help conceal any unwanted flavours from the soy.

The researchers are continuing the work on optimising the consistency and taste of the product with the expectation that a commercial partner will be able to bring it to market.

Source: Food & Drink International

Walnuts may be Good for the Gut and Help Promote Heart Health

Katie Bohn wrote . . . . . . . . .

Walnuts may not just be a tasty snack, they may also promote good-for-your-gut bacteria. New research suggests that these “good” bacteria could be contributing to the heart-health benefits of walnuts.

In a randomized, controlled trial, researchers found that eating walnuts daily as part of a healthy diet was associated with increases in certain bacteria that can help promote health. Additionally, those changes in gut bacteria were associated with improvements in some risk factors for heart disease.

Kristina Petersen, assistant research professor at Penn State, said the study — recently published in The Journal of Nutrition — suggests walnuts may be a heart- and gut-healthy snack.

“Replacing your usual snack — especially if it’s an unhealthy snack — with walnuts is a small change you can make to improve your diet,” Petersen said. “Substantial evidence shows that small improvements in diet greatly benefit health. Eating two to three ounces of walnuts a day as part of a healthy diet could be a good way to improve gut health and reduce the risk of heart disease.”

Previous research has shown that walnuts, when combined with a diet low in saturated fats, may have heart-healthy benefits. For example, previous work demonstrated that eating whole walnuts daily lowers cholesterol levels and blood pressure.

According to the researchers, other research has found that changes to the bacteria in the gastrointestinal tract — also known as the gut microbiome — may help explain the cardiovascular benefits of walnuts.

“There’s a lot of work being done on gut health and how it affects overall health,” said Penny Kris-Etherton, distinguished professor of nutrition at Penn State. “So, in addition to looking at factors like lipids and lipoproteins, we wanted to look at gut health. We also wanted to see if changes in gut health with walnut consumption were related to improvements in risk factors for heart disease.”

For the study, the researchers recruited 42 participants with overweight or obesity who were between the ages of 30 and 65. Before the study began, participants were placed on an average American diet for two weeks.

After this “run-in” diet, the participants were randomly assigned to one of three study diets, all of which included less saturated fat than the run-in diet. The diets included one that incorporated whole walnuts, one that included the same amount of alpha-linolenic acid (ALA) and polyunsaturated fatty acids without walnuts, and one that partially substituted oleic acid (another fatty acid) for the same amount of ALA found in walnuts, without any walnuts.

In all three diets, walnuts or vegetable oils replaced saturated fat, and all participants followed each diet for six weeks with a break between diet periods.

To analyze the bacteria in the gastrointestinal tract, the researchers collected fecal samples 72 hours before the participants finished the run-in diet and each of the three study diet periods.

“The walnut diet enriched a number of gut bacteria that have been associated with health benefits in the past,” Petersen said. “One of those is Roseburia, which has been associated with protection of the gut lining. We also saw enrichment in Eubacteria eligens and Butyricicoccus.”

The researchers also found that after the walnut diet, there were significant associations between changes in gut bacteria and risk factors for heart disease. Eubacterium eligens was inversely associated with changes in several different measures of blood pressure, suggesting that greater numbers of Eubacterium eligens was associated with greater reductions in those risk factors.

Additionally, greater numbers of Lachnospiraceae were associated with greater reductions in blood pressure, total cholesterol, and non-HDL cholesterol. There were no significant correlations between enriched bacteria and heart-disease risk factors after the other two diets.

Regina Lamendella, associate professor of biology at Juniata College, said the findings are an example of how people can feed the gut microbiome in a positive way.

“Foods like whole walnuts provide a diverse array of substrates — like fatty acids, fiber and bioactive compounds — for our gut microbiomes to feed on,” Lamendella said. “In turn, this can help generate beneficial metabolites and other products for our bodies.”

Kris-Etherton added that future research can continue to investigate how walnuts affect the microbiome and other elements of health.

“The findings add to what we know about the health benefits of walnuts, this time moving toward their effects on gut health,” Kris-Etherton said. “The study gives us clues that nuts may change gut health, and now we’re interested in expanding that and looking into how it may affect blood sugar levels.”

Source: The Pennsylvania State University

Why Patients with Dementia Could Benefit from Cooking

Robert Firpo-Cappiello wrote . . . . . . . . .

Paula Wolfert knew something was wrong.

In 2010, at age 72, the award-winning cookbook writer noticed an unsettling development: Her previously sharp memory—for exotic ingredients, complex recipes, and the names of hundreds of friends she’d made traveling the world—was slipping. Now she struggled to remember the foreign languages she’d mastered; even reading English became a challenge. The words seemed to be “floating on the page,” she told friends.

At first Wolfert’s closest friends, and even some doctors, dismissed her memory lapses as age related. Wolfert wasn’t convinced, and as her memory continued to decline, she sought advice from a neurologist who took her medical history, conducted memory and cognitive tests, and had her undergo an MRI. Based on these results, the neurologist diagnosed her with mild cognitive impairment, which can be a precursor to Alzheimer’s disease.

After a lifetime of inspiring home cooks and acclaimed chefs such as Alice Waters and Thomas Keller with groundbreaking cookbooks that include Couscous and Other Good Food from Morocco (Harper & Row, 1973) and The Cooking of the Eastern Mediterranean (HarperCollins, 1994), Wolfert had acquired a reputation as an innovative thinker who was passionate about what she believed in. When she was a child, a psychologist told Wolfert’s parents that the little girl was a “renegade.”

That spirit has remained strong in the face of her diagnosis and decline in cognitive abilities. “Despite her struggles, Paula wants to continue cooking as long as it is safe,” says Emily Kaiser Thelin, author of Unforgettable: The Bold Flavors of Paula Wolfert’s Renegade Life (Grand Central Life & Style, 2017). The two women spent hours talking, reviewing recipes, and working in the kitchen together as Thelin crafted the hybrid biography/cookbook. “Paula told me, ‘This illness takes forever, and I’m determined to make it take as long as it can.'” (Wolfert no longer gives interviews, but a close circle of friends and associates, including Thelin, occasionally speak on her behalf.)

For Wolfert, coping with cognitive impairment—and the eventual confirmation that she has Alzheimer’s dementia—has meant not just eating well (she’s long embraced a Mediterranean diet that focuses on lean meats and fatty fish, fresh fruits, and vegetables) but also continuing to cook. Now, though, she’s cooking in a new way, one that helps her maintain the physical activity and social support that are increasingly recognized as important in dealing with dementia. “While Paula can no longer follow recipes,” Thelin says, “she’s still able to improvise basics, especially with someone else in the kitchen to help. She focuses on simple ingredients such as wild-caught salmon and mackerel and a rainbow of fresh vegetables, and simple techniques such as steaming to create bountiful lunches for herself.”

Wolfert also meets with friends at a local community center where she hosts a “memory cafe,” an informal social gathering for people with Alzheimer’s and other forms of dementia or cognitive challenges and their caregivers. She also travels to Washington, DC, as a spokesperson for the Alzheimer’s Association. As her grandmother once told her, you can’t win a war if you’re not willing to fight.

Wolfert’s neurologist, Catherine A. Madison, MD, director of the Ray Dolby Brain Health Center in San Francisco, has encouraged Wolfert’s healthy eating habits and efforts to remain engaged socially. She also has persuaded Wolfert to meditate and exercise. Under Dr. Madison’s guidance, Wolfert started jogging for 20 minutes on a treadmill, meditating for 15 minutes using an app, and attending yoga and qigong classes. Her friends have been amazed at how the previously exercise-averse Wolfert has taken to these new physical activities.

A few small studies suggest that cooking may be beneficial in the fight against cognitive decline. Larger studies, however, suggest that it may be the socializing aspect of cooking and other interactive activities that is more important.

A large retrospective analysis conducted by researchers at University College London, published in PLOS Medicine in 2019, looked at data from more than 10,000 mid-to-late-life participants in the Whitehall II study, which began in 1985 and required participants to complete cognitive tests five times between 1997 and 2016. The analysis of cognitive test results and other health records strongly suggests that greater frequency of social interactions at age 60 is associated with higher cognitive performance in later life and a lower risk of developing dementia.

These results echo those of earlier work, such as a research review published in the Journal of Aging Research in 2012 that suggests that physical activity, intellectual stimulation, and socialization improve cognition and overall well-being in people with age-associated cognitive impairments and may provide a similar benefit for those with dementia.

In one of the first studies to examine the role of cooking in brain health, published in the American Journal of Recreation Therapy in 2003, Suzanne Fitzsimmons, MS, a nurse practitioner and former instructor in therapeutic geriatric care at the University of North Carolina Greensboro, and the late Linda L. Buettner, PhD, former professor of gerontology and therapeutic recreation, found that cooking in a safe environment helped reduce passivity and agitation in adults in assisted living who had varying degrees of dementia.

“Cooking has a powerful meaning for older adults,” says Fitzsimmons. “For some, it can be integral to feelings of self-worth and identity.” The cooking programs that Fitzsimmons led for adults in group settings—inspired by the theory that maintaining roles and activities people are used to is key as they age—have been shown to increase appetite, encourage people to join a social gathering, and relieve stress.

“I was amazed that even participants who had not cooked for a long time took to the kitchen without much prompting—they seemed to be in their element,” says Fitzsimmons, who has retired from teaching. “And some of the very low-functioning participants surprised us: After making butter, they independently spread it on bread. This may not sound like much, but these older adults had been fed by staff for more than a year. After participating in the program for a few weeks, they were able to eat finger foods independently. They also started communicating more, especially with cooking partners, recalling fondly what they cooked and telling family members what they had accomplished.”

Encouraging people with dementia to cook comes with safety hazards: sharp tools, open flames, spills, forgetting to turn off burners or ovens, and other risks. That’s why therapeutic cooking programs—and any attempt to reproduce them at home—must include supervision and must match cooking chores to people’s level of functioning. More complex tasks might include making shopping lists and cutting stems off strawberries. Simpler tasks would be stirring ingredients in a bowl, shaking a sealed container of ingredients, wiping surfaces, clearing a table, and drying dishes.

While the benefits of staying active and socially engaged and eating a healthy diet are increasingly clear, the science behind the recommendations is still evolving. “We don’t know for certain what particular mechanisms are at work to bring about these benefits,” says Dr. Madison. “Every person is unique. The complex relationships between our own biology and genetic expression, environment, and diet make research in neurodegenerative diseases particularly challenging.”

As for Wolfert, she worked with Thelin and “Team Renegade” to review and test recipes, plan photo shoots, and participate as fully as possible in the publication of Unforgettable. “When we were shooting recipes for the book, Paula tasted every dish we prepared,” says Thelin. “More often than not, she would insist she could not remember anything about the dishes. But we learned to roll with it, to cherish the unpredictable moments when memories would shake loose, such as the time I prepared cassoulet for her and she vividly recalled and described watching a French housewife prepare cassoulet for her 50 years earlier.” But as with everyone diagnosed with cognitive impairment, Wolfert’s future remains uncertain.

“While the inevitable progression of Paula’s Alzheimer’s dementia has made cooking challenging for her, I’ve been endlessly amazed by how she has found fresh inspiration in new passions, including taking to exercise well into her seventies,” Thelin says. “It’s quite something how the diagnosis has, in surprising ways, widened her world through the memory cafe and in her work with the Alzheimer’s Association.”

Source: Brain & Life

Probiotics: Don’t Buy the Online Hype

Serena Gordon wrote . . . . . . . . .

Many people turn to the internet with health questions, but how reliable is the information you find? When it comes to probiotics, a new study urges caution.

The research found that of 150 websites that came up with a search of probiotics, most were commercial sites, hoping to sell a product. Others were news sites or health portals (providing links to other sites). Many of these sites mentioned potential benefits of probiotics, though not all had scientific evidence to back up those claims. And just 1 in 4 of the websites mentioned any potential side effects from taking probiotics.

“This study demonstrates that a number of online claims on the health benefits of probiotics are not supported by scientific evidence,” said study co-author Dr. Michel Goldman, a professor of immunology at the Universite Libre de Bruxelles in Belgium.

Probiotics are “good” bacteria found in yogurt and other fermented foods and in dietary supplements, according to the U.S. National Center for Complementary and Integrative Health. Some of these bacteria are also found naturally in the human body. They may help digest food, fight germs that can cause disease, or produce vitamins.

“Probiotics can clearly be helpful in the management of infectious diarrhea, in pregnant women with gestational diabetes, and as an adjunct to food allergy desensitization therapy,” Goldman said. He added that probiotics might also be helpful for the skin condition eczema and for some urinary or genital infections in women.

But his team saw some broad claims online about probiotics’ benefits, such as being beneficial in treating cancer. There’s no scientific evidence to support those claims.

For the study, Goldman and his colleagues looked at the first 150 pages brought up by Google in response to a search for “probiotics.” They reviewed the information on these pages for reliability and searched a large database of clinical trials for evidence supporting those claims.

One bright spot was that Google appears to prioritize more reliable sources of information over commercial websites.

Still, consumers should be wary of health information they get online.

“Consumers should look whether there is scientific information published in peer-reviewed medical journals supporting claims to probiotics and over-the-counter health products that are not regulated as rigorously as prescription drugs. They should discuss with their doctors, the benefits they can expect from probiotics,” Goldman said.

Dr. Melinda Ring, executive director of the Osher Center for Integrative Medicine at Northwestern University in Chicago, said she wasn’t surprised by the findings.

“This is a big problem in the natural product and dietary supplement area. There’s a preponderance of less reputable information from sales and commercial sources,” said Ring, who wasn’t part of the research.

“People really need to look at the claims websites are making. Are they promising unrealistic cures? Are they referencing scientific data?” she said.

One area where probiotics may be helpful is in maintaining the body’s natural balance of beneficial bacteria — the gut microbiome. “We know the human microbiome is incredibly important to our health and the development of disease, but we’re just in the infancy of understanding how to manipulate the microbiome,” Ring said.

If you’re interested in improving your gut’s microbiome, the first place to start is improving your diet, because what you eat is also food for your microbiome, Ring said. Focus on vegetables, fruits and whole grains.

A number of foods have probiotics, such as yogurt and fermented foods. But sometimes the probiotics that occur naturally in foods can be destroyed by processing and preserving. Ring recommended looking for “live cultures” on the packaging.

If you take probiotic supplements, she suggested sticking with reputable brands, and perhaps taking more than one product to make sure you’re getting a diversity of probiotics.

Andrea Wong is senior vice president of scientific and regulatory affairs for the Council for Responsible Nutrition (CRN), which represents the supplement industry. She said that research demonstrates that probiotics are safe and have health benefits.

“When it comes to reliable information on probiotics and other dietary supplements, doctors and other health care practitioners are the most trusted sources. CRN encourages consumers to be smart shoppers and do their due diligence when looking for dietary supplement information,” Wong said.

The findings were published in Frontiers in Medicine.

Source: HealthDay


Today’s Comic

Doctors in U.K. Say We should Eat More Offal to Save the Planet

Health experts claim tucking into kidneys, liver and oxtail is healthier than veganism and helps the environment.

And the Public Health Collaboration (PHC) charity has launched a rival campaign to Veganuary called Organuary.

It is promoting organ meat to fight obesity and diabetes with the slogan: “Minimise waste, maximise nutrition.”

PHC trustee Dr Joanne McCormack said: “People these days believe being vegan is best.

“But you have to have a lot of supplements to be healthy on a vegan diet. Organ meat, however, is very cheap and very nutritious. Eating just a little packs a lot of punch nutritionally.”

Top chef Giancarlo Caldesi claims offal helped reverse his type 2 diabetes. He said: “Offal has so much goodness. I’m not anti-vegan, but our bodies intended us to be omnivore.”

Offal used to be popular in the last century, but has almost disappeared from Britain’s dinner table. It is made from any meat that isn’t attached to a carcass and also includes tripe, tongue and brain.

More than 300,000 people have signed up to Veganuary this month.

And Veganuary spokeswoman Toni Vernelli said: “We don’t see Organuary as being in competition to us.

“They will probably have a tough job selling their message as a lot of people are squeamish about offal.”

Source: Daily Star