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Vegetarians are slimmer and less extroverted than meat eaters

Vegetarian food contains dietary fibres and has a positive effect on the microbiome in the intestine. This is another reason why they could fill you up earlier than those made from animal ingredients.

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According to a survey by the Allensbach Institute, more than 6.1 million Germans stated last year that they were vegetarians, 400,000 more than two years earlier. A large-scale study at the Max Planck Institute for Human Cognitive and Brain Sciences (MPI CBS) in cooperation with the University Hospital of Leipzig has now examined in almost 9,000 people how this form of nutrition is related to the body and the psyche – regardless of age, gender and level of education.

It was found that the rarer the proportion of animal food in a person’s diet, the lower their body mass index (BMI) on average and thus their body weight. One reason for this could be the lower proportion of heavily processed foods in the plant diet.

“Products that are excessively rich in fat and sugar are particularly fattening. They stimulate the appetite and delay the feeling of satiety. If you avoid animal foods, you consume fewer such products on average,” explains Evelyn Medawar, first author of the underlying publication, which has now been published in the journal Nutrients.

In addition: Vegetarian food contains dietary fibres and has a positive effect on the microbiome in the intestine. This is another reason why they could fill you up earlier than those made from animal ingredients.

“People who eat predominantly vegetable foods may therefore absorb less energy,” Medawar adds.

In addition to a changed feeling of satiety, lifestyle factors such as more sport and greater health awareness could also play a decisive role.

For the BMI it also seems to make a difference which animal products a person feeds on. If it is predominantly so-called primary animal products, i.e. meat, sausage and fish, the person usually has a higher BMI than someone who eats primarily secondary animal products, i.e. eggs, milk, dairy products, cheese and butter. In the former case the correlation is statistically significant.

Medawar uses an example to illustrate what this could mean for nutrition: “A person with a 1.2 point lower BMI on average either completely avoids certain animal products, such as the primary ones, and is on a vegetarian diet. Or she continues to eat meat and fish, but less often. Whether nutrition is ultimately the cause of lower body weight or whether other factors are responsible for it cannot be determined from the data. A follow-up study in cooperation with the University Hospital Leipzig will now shed light on this.

The researchers also found out that vegetarian or vegan nutrition is also related to personality. Especially with one of the five major personality factors, extroversion. It was shown that people with predominantly plant-based foods on their diet are more introverted than those who mainly fed on animal products.

“It is difficult to say what the reason for this is,” says Veronica Witte. “It could be because more introverted people tend to have more restrictive eating habits or because they are more socially segregated because of their eating habits.” Here, again, further studies should follow on how people identify with the characteristics of their diet.

However, they could not confirm that a plant-based diet is associated with a tendency towards neurotic behaviour, as other studies suggested. “Earlier analyses had found that more neurotic people were generally more likely to avoid certain groups of foods and to behave more restrictively. We focused here solely on the avoidance of animal products and could not observe any correlation,” explains study leader Veronica Witte.

In a third part, they finally concentrated on the question of whether a predominantly plant-based diet is more often associated with depressive moods. Here previous studies had also suggested a relationship between the two factors.

“We could not detect this correlation,” says Witte. “It is possible that in previous analyses other factors had blurred the results, including the BMI or conspicuous personality traits that are known to be associated with depression. We accounted for them,” said Witte explaining a possible reason for the different results. In addition, the plant-based diet is now more common and more accepted and not anymore restricted to a certain group.

The scientists had investigated these connections within the so-called LIFE project, a broad-based study in cooperation with the University Hospital of Leipzig. They determined the personal diets by means of questionnaires in which the participants were asked to fill in how often they had eaten the individual animal products in the last 12 months – from “several times a day” to “never”.

The personality traits such as extroversion and neuroticism were assessed by means of a so-called personality inventory (NEOFFI), while depression was assessed by means of the so-called CESD test, a questionnaire that records various symptoms of depression.

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Telling people they might lose motivates more than telling them they might win, research shows

How managers choose to frame problems directly influences employees’ motivation to speak up at work. For managers, this is an insightful approach for building more open and collaborative teams.

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Athletes say they hate to lose more than they love to win. New research finds the same sentiment is shared in organizations.

A Virginia Tech researcher and his colleagues discovered that when managers frame work problems as a potential loss, employees are more likely to take action than when those problems are framed as potential gains. The research also revealed that when the potential loss impacts a larger group, employees are more likely to take action in the form of speaking up to a supervisor in hopes of finding a solution. The findings were recently published in the Journal of Applied Psychology.

For managers, this research suggests that framing work problems as potential losses can influence employees to speak up more.

“Employee voice occurs when suggestions are made to improve organizational functioning,” said Phil Thompson, associate professor in the Pamplin College of Business Department of Management. “From an organizational perspective, the positive outcomes of employee voice include improved performance, effectiveness, and workplace safety. From an employee level, speaking up is positively related to creativity, innovation, engagement, and ethical behavior.”

At its core, this research shows that how managers choose to frame problems directly influences employees’ motivation to speak up at work. For managers, this is an insightful approach for building more open and collaborative teams.

“When managers say, ‘If we don’t get this done, not only will you lose the $5,000 bonus, but everybody in this work group is going to lose a $5,000 bonus,’ it magnifies an employee’s motivation to act in a proactive way,” said Thompson. “This suggests that framing work problems as what will be collectively lost – compared to what can be individually lost – makes employees want to speak up more.”

Thompson was part of a research team led by Jeffery Thomas and Jonathan Booth from The London School of Economics and Mark Bolino from Oklahoma University. Together they analyzed responses from nearly 2,000 full-time employees, MBA students, and employee-supervisor pairs for their experience in situations where work problems were framed as either a gain or a loss. Across three different studies, framing something as a loss yielded employees to voice a work suggestion more.

For example, a manager dealing with a reputational crisis of their team, such as a product quality issue, can frame the problem in a way to spark helpful employee suggestions on how to resolve the issue. For example, instead of saying “if this product has great quality, our company will look really good” a manager saying “if this product is not up to quality standards, our reputation will be damaged” carries more weight for the team. When this reputational risk is shared by everyone, employees are more willing to step forward to help the problem.

In the first study, participants were asked to think about a problem at work that was significant for them. From there, they were randomly assigned to write about the potential losses or gains from that problem. They were also asked to indicate how likely they were to talk about these problems to their supervisor. Participants who reflected on their potential losses showed a 16 percent higher willingness to speak up compared to those who focused on the potential gains.

When it came to the MBA students, they read a fictional performance review scenario where a workplace problem was described. They then rated how willing they would be to speak up about that scenario if they were in the situation. One example suggested that the entire team might fall short of its goals if an issue was not addressed. This specific scenario yielded the most likelihood of speaking up 35 percent more than the scenario’s suggesting that only they would miss their goal, supporting the research’s findings that an employee is more likely to speak up when the loss impacts more people.

The third study looked at employee-supervisor pairings to understand how these relationships play out in the real world. Using pairings from across three industries, employees reported a workplace problem they encountered and their supervisor rated how often that employee spoke up on the job. While the first two studies involved hypothetical scenarios, this real-world evidence showed that employees were 8-10 times more likely to speak up when issues were framed as a potential collective loss compared with a potential collective gain. 

“This research is really geared toward managers so they can facilitate and understand how and why their employees will speak up,” said Thompson. “You can talk about the issue, but it always ends in terms of how we frame things.” 

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Yoga practice could reduce blood pressure in people with obesity

People who practiced yoga had a significant decrease in blood pressure, with systolic blood pressure lowered by an average of 4.35 mmHg and diastolic blood pressure by 2.06 mmHg.

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Practicing yoga could help people with overweight or obesity improve their cardiometabolic health, according to a study in the open-access journal PLOS Global Public Health by Widya Wasityastuti from the University of Edinburgh, Scotland, and colleagues.

Yoga is a popular form of exercise around the world, and is a gentle and accessible form of exercise for many people. To better understand the potential health benefits of yoga, the authors of this study performed a meta-analysis, examining 30 studies of yoga for its cardiometabolic benefits. They focused on studies which examined outcomes for blood pressure, lipid profiles, glucose homeostasis, markers of inflammation, and measures of antioxidants, and those which examined people with body-mass index over 23 for Asian countries, and 25 for other countries, indicating that participants had overweight or obesity. Of the 30 studies considered, 23 were conducted in Asian countries, while the remaining studies were from the United States, Germany, and Australia.

Across the 30 studies and a total of 2,689 participants, the authors found that people who practiced yoga had a significant decrease in blood pressure, with systolic blood pressure lowered by an average of 4.35 mmHg and diastolic blood pressure by 2.06 mmHg. They also found modest beneficial effects on low- and high-density lipoproteins, types of cholesterol that have been linked to an increased risk of stroke. 

The authors note that the studies analyzed were not specifically recruiting people with obesity, and there was no dose-response measured, so it is unknown how much yoga is needed to produce these effects, though the studies they analyzed favored practice of at least 180 minutes per week.

The studies also focused heavily on Asian participants, and practitioners with comorbidities were excluded from analysis. Finally, it’s important to note that due to the nature of this study, causality cannot be confirmed here despite the correlations found.

Further studies will be needed to understand whether yoga can provide similar benefits to other populations, as well as people with co-morbidities such as diabetes or heart disease.

The authors suggest that while more high-quality trials are needed, the meta-analysis supports potential benefits of yoga for cardiometabolic health in people with overweight and obesity.

The authors summarize: “Our review suggests that yoga may offer a helpful additional option for improving some aspects of cardiometabolic health in adults with overweight or obesity, particularly blood pressure.”

They add: “Yoga is often seen mainly as a wellbeing practice, but our findings suggest it may also support certain cardiometabolic health outcomes in adults with overweight or obesity.”

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Stress, BMI, and hormones linked to earlier puberty in girls

Higher levels of key steroid hormones—combined with elevated stress and body mass index (BMI)—are associated with earlier onset of puberty in girls.

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Higher levels of key steroid hormones—combined with elevated stress and body mass index (BMI)—are associated with earlier onset of puberty in girls, according to a new study at Columbia University Mailman School of Public Health.

The findings are published in The Journal of Clinical Endocrinology & Metabolism.

 Elevated prepuberty urinary levels of glucocorticoids, androgens, and progesterone were strongly linked to accelerated breast development (thelarche). Girls with high glucocorticoid levels alongside high BMI and stress entered puberty an average of seven months earlier than peers with lower levels.

“While stress and BMI have long been recognized as independent predictors of puberty, few studies have examined how they interact with a girl’s hormones,” said Lauren Houghton, PhD, assistant professor of Epidemiology at Columbia Mailman School, and first author. “Our findings challenge conventional research that has largely focused on estrogen and body size, highlighting instead the role of stress and androgens – typically thought of as male hormones– in shaping pubescent development.”

The strongest associations were observed for progesterone, androgens, and glucocorticoids, indicating that multiple hormonal pathways—not just estrogen—play a critical role in the timing of puberty.

For example:

  • Higher glucocorticoid, androgen, and progesterone metabolites were associated with earlier onset of puberty
  • Elevated androgens and progesterone were also linked to a longer duration of puberty
  • Estrogen metabolites were associated with delayed onset, not acceleration
  • The effects of hormones on puberty timing were significantly modified by BMI and stress levels.

 Notably, the associations were consistent regardless of family history of breast cancer.

“Our objective was to identify the full set of hormonal patterns linked to accelerated puberty and test whether BMI and stress modify this relationship,” said Houghton, who is also assistant professor at the Herbert Irving Comprehensive Cancer Center at Columbia. “We predicted that girls with elevated BMI and stress would experience the earliest onset—and that the stress response shifts during this key time for girls.”

The researchers drew on data from the LEGACY Girls Study, a cohort of 1,040 girls ages 6 to 13 recruited across the U.S. States and Canada. Participants were followed every six months with clinical assessments, questionnaires, and biospecimen collection.

The analysis included 327 girls who were at the pre-puberty stage at baseline and provided urine samples at least one year before the onset of puberty. Houghton and colleagues measured a comprehensive panel of steroid metabolites using first-morning urine samples and tracked puberty development using validated clinical scales.

Mothers of the girls completed an Internalizing Composite Scale, which includes subscales for anxiety, depression, and other at-risk status. They also provided information on girls’ family history of all cancers as well as on pregnancy and infancy, including birth weight and their child’s race and ethnicity. Trained research staff measured height and weight twice every 6 months. 

“Unlike prior research, this study simultaneously examined hormonal patterns, BMI, and psychosocial stress—captured through standardized behavioral assessments—within the same cohort,” said senior author Mary Beth Terry, PhD, professor of Epidemiology at Columbia Mailman School, and the Herbert Irving Cancer Center, and Silent Spring Institute.  “Interestingly, we also learned that the associations were consistent regardless of family history of breast cancer.”

The findings may help explain the ongoing trend toward earlier puberty and point to actionable prevention strategies, observed the authors.

 “Stress-reducing interventions and healthy lifestyle changes may help delay early puberty and improve long-term health outcomes,” said Houghton. ‘Because early puberty is linked to increased breast cancer risk later in life, the results have important implications for both pediatric care and public health.”

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