NewsMakers
Long-term yogurt consumption tied to decreased incidence of certain types of colorectal cancer
Yogurt consumption over time may protect against colorectal cancer through changes in the gut microbiome.
Yogurt, which contains live strains of bacteria, is thought to protect against many types of diseases, with some reports indicating it could reduce risk of colorectal cancer. A new study led by investigators from Mass General Brigham finds that yogurt consumption over time may protect against colorectal cancer through changes in the gut microbiome.
Using data from studies that have followed participants for decades, researchers found that long-term consumption of two or more servings per week of yogurt was tied to lower rates of proximal colorectal cancer positive for Bifidobacterium, a bacterial species found in yogurt. The study showed that the bacterial species was quite common: about 30 percent of patients with colorectal cancer had detectable Bifidobacterium in their tumor tissue. Their results are published in Gut Microbes.
“Our study provides unique evidence about the potential benefit of yogurt,” said corresponding author Shuji Ogino, MD, PhD, the chief of the Program in Molecular Pathological Epidemiology in the Department of Pathology at Brigham and Women’s Hospital, a founding member of the Mass General Brigham healthcare system. Ogino is also an American Cancer Society Professor, a Professor at Harvard T.H. Chan School of Public Health, and an Affiliate Member of the Broad Institute of MIT and Harvard. “My lab’s approach is to try to link long-term diets and other exposures to a possible key difference in tissue, such as the presence or absence of a particular species of bacteria. This kind of detective work can increase the strength of evidence connecting diet to health outcomes.”
Ogino and colleagues – team OPTISTIMISTICC – are funded by Cancer Research UK through Cancer Grand Challenges, a research initiative co-founded by Cancer Research UK and the National Cancer Institute in the United States. OPTIMISTICC aims to transform the understanding of how the microbiome contributes to disease development, progression and response to treatment. As part of this, Ogino’s team aims to define the risk factors and environmental exposures that individuals encounter through life which are behind the rise of early-onset colorectal cancer and ultimately develop strategies to reduce the burden of this type of cancer.
To conduct their study, the researchers used data from two U.S.-wide prospective cohort studies known as the Nurses’ Health Study (NHS) and the Health Professionals Follow-up Study (HPFS). The studies have followed more than 100,000 female registered nurses and 51,000 male health professionals, respectively. Participants have been followed since 1976 for the NHS and 1986 for HFPS, answering repeated questionnaires about lifestyle factors and disease outcomes, including questions about average daily intake of plain and flavored yogurt, as well as other dairy products. The researchers also assessed tissue samples for participants with confirmed cases of colorectal cancer, measuring the amount of Bifidobacterium DNA in tumor tissue.
The researchers found 3,079 documented cases of colorectal cancer in the two study populations. Information on Bifidobacterium content was available in 1,121 colorectal cancer cases. Among those, 346 cases (31%) were Bifidobacterium-positive, and 775 cases (69%) were Bifidobacterium-negative. The researchers did not observe a significant association between long-term yogurt intake and overall colorectal cancer incidence, but they did see an association in Bifidobacterium-positive tumors, with a 20 percent lower rate of incidence for participants who consumed two or more servings of yogurt a week. This lower rate was driven by lower incidence of Bifidobacterium-positive proximal colon cancer—a type of colorectal cancer that occurs in the right side of the colon. Studies have found that patients with proximal colon cancer have worse survival outcomes than patients with distal cancers.
“It has long been believed that yogurt and other fermented milk products are beneficial for gastrointestinal health,” said co-senior author Tomotaka Ugai, MD, PhD, of the Department of Pathology at the Brigham and the Department of Epidemiology at the Harvard T.H. Chan School of Public Health. “Our new findings suggest that this protective effect may be specific for Bifidobacterium-positive tumors.”
The researchers hypothesize that long-term yogurt intake may reduce risk of proximal colon cancer by changing the gut microbiome, including Bifidobacterium, but they note that further research that brings together both basic science and population health studies is needed to draw a definitive conclusion.
“This paper adds to the growing evidence that illustrates the connection between diet, the gut microbiome, and risk of colorectal cancer,” said co-author Andrew T Chan, MD, chief of the Clinical and Translational Epidemiology Unit at Massachusetts General Hospital, a founding member of the Mass General Brigham healthcare system and co-lead for Cancer Grand Challenges team PROSPECT addressing causes of cancer in young adults. “It provides an additional avenue for us to investigate the specific role of these factors in the risk of colorectal cancer among young people.”
In addition to Ogino, Ugai and Chan, Mass General Brigham authors include Satoko Ugai, Hidetaka Kawamura, Kota Arima, Kazuo Okadome, Qian Yao, Kosuke Matsuda, and Yuxue Zhong. Additional authors include Li Liu, Keisuke Kosumi, Tsuyoshi Hamada, Kosuke Mima, Hiroki Mizuno, Wendy S. Garrett, Mingyang Song, Marios Giannakis, Edward L. Giovannucci, and Xuehong Zhang.
Beauty & Fashion
Redefining aesthetics: From anti-aging to healthy aging
Growing attention is now being given to healthy aging, understanding how the entire face changes over time, preserving facial harmony, and helping people continue to look like themselves.
For decades, “anti-aging” has defined the beauty and aesthetics conversation, promising to erase wrinkles and reverse the signs of time. Today, that conversation is shifting.
Aging is no longer just about looking younger. Growing attention is now being given to healthy aging, understanding how the entire face changes over time, preserving facial harmony, and helping people continue to look like themselves.
A review published in Facial Plastic Surgery, The Anatomy of the Aging Face: A Review, describes aging as changes across bone, ligaments, muscles, fat, and skin. Another review in Aesthetic Surgery Journal, The Facial Aging Process From the “Inside Out”, explains how changes beneath the surface eventually become visible on top.
Studies in Plastic and Reconstructive Surgery show facial fat is organized into distinct anatomical compartments that can lose volume and shift position over time, altering facial shape and balance.
For multi-awarded aesthetic physician Dr. James Co, founder of Cosma Institute and Architect of Aesthetic Confidence, these findings are the reason aesthetic care must start with understanding, not just treating.
“Aging is not a disease we need to cure,” Co said. “It is a biological process. As physicians, our role is to understand what is changing beneath the surface, how those changes differ from person to person, and whether intervention is appropriate in the first place.”
“When you only look at the wrinkle, you are looking at the surface of a much bigger anatomical process,” he added. “The face ages as a system. Good assessment means understanding what is happening underneath before deciding what should be done on the surface.”
Part of that understanding is recognizing that no two faces age the same way. Two people can be the same age and experience aging very differently. Genetics, skeletal structure, fat distribution, skin characteristics, sun exposure, lifestyle, and environmental factors all influence how aging presents.
“Two patients can be the same age and come to me with completely different anatomy, lifestyles, concerns, and goals,” Co said. “Why would we expect their treatment plans to look exactly the same?”
This is where healthy aging broadens the conversation — from fixing isolated signs to looking at the face as a whole and listening to what the individual actually wants.
“Someone can want to look refreshed without wanting to look 20 years younger,” Co said. “Those are completely different goals.”
Rather than trying to freeze one version of the face forever, healthy aging acknowledges that the face will continue to change. As different structures change at different rates, the relationship between features evolves. Facial harmony is therefore not fixed.
“You cannot freeze one version of your face forever,” Co said. “But you can understand how the face is changing and make decisions that respect its natural proportions and your identity.”
In the age of social media, where aesthetic treatments are highly visible, Co cautions against self-diagnosis.
“Patients should not have to diagnose themselves from social media,” he said. “You might recognize a concern, but deciding why it is happening and what should be done about it requires proper assessment.”
The shift is also about how people feel, not just how they look. A 2022 review on minimally invasive facial aesthetic procedures found studies are increasingly looking beyond physical changes to include satisfaction with appearance and aspects of psychological and social well-being, while noting that evidence still needs careful interpretation.
For Co, this reinforces that success is not always about looking dramatically younger.
“We need to ask whether the result makes sense for the patient, whether expectations were met, and whether we preserved the things that make that person recognizable,” he said. “I would rather someone tell my patient, ‘You look well,’ than immediately ask, ‘What did you have done?'”
At Cosma Institute, Co applies this consultation-led philosophy through individualized assessment, facial harmony, medical judgment, and patient education. Having trained aesthetic practitioners across Southeast Asia and Europe, he advocates for natural-looking outcomes that respect the characteristics already present in each face — an approach that recently earned him two awards at the Merz Aesthetics Tala Awards.
For Co, the evolution of aesthetic medicine is not about having more tools, but knowing when to use them — and when not to.
“Aging cannot be stopped, and I don’t think that should be the promise,” he said. “What we can do is understand it better. We can look at the science, understand the anatomy, listen to the patient, and make decisions that allow them to age while still looking recognizably like themselves.”
For Co, healthy aging begins not with fighting age, but with understanding it.
NewsMakers
The look and feel of your neighborhood may affect your sleep
Those living in neighborhoods rated as having a stronger sense of safety tended to sleep longer, and that this rating appeared to be shaped by the streetscape.
Your neighborhood’s “streetscape”—the physical environment of your street—is something that you have probably never consciously thought about, despite seeing it every day. But what if the streetscape was affecting you on a subconscious level and disrupting your sleep?
This intriguing question is posed by the findings of a study led by Professor Daisuke Matsushita of the Graduate School of Human Life and Ecology at Osaka Metropolitan University. The research team used AI to analyze more than 200,000 Google Street View images to identify visual neighborhood characteristics. They then linked these characteristics to the self-reported sleep of 1,089 working adults living on the lower floors of apartments in Tokyo, who were most likely to be affected by the streetscape.
They found that those living in neighborhoods rated as having a stronger sense of safety tended to sleep longer, and that this rating appeared to be shaped by the streetscape. Generally, people slept longer in areas with lots of greenery, such as leafy trees, on the street. Similarly, high “enclosure”—meaning many tall vertical buildings and few wide-open spaces—was also associated with longer sleep and fewer insomnia symptoms.
However, the study also made a surprising finding. The researchers found that highly walkable streetscapes, such as those with more sidewalks and traffic signs, were associated with a lowered sense of safety and shortened sleep duration.
This suggests that walkability does not always represent a reassuring environment. Instead, a possible explanation is that streets with extensive pedestrian infrastructure are often busier, more crowded, and used by more strangers, which may be perceived as less safe or less relaxing than quieter residential streets.
“This study demonstrates the potential for evaluating streetscape characteristics across large geographic areas in a cost-effective manner,” Dr. Matsushita said. “Based on the technique used in this study, cities could potentially measure perceived safety, beauty, liveliness, and enclosure as well as pollution and noise.”
“We hope that opening up this new perspective creates further possibilities for designing healthier neighborhoods,” he concludes.
The findings were published in Building and Environment.
NewsMakers
Workout or nap? Either can help your sleepless brain, study finds
People who either completed 20 minutes of moderate-to-vigorous exercise or took a 90-minute nap performed about 22 per cent better on memory tests after 30 hours without sleep than those who did neither.
A short workout or a nap can help protect memory after a sleepless night, a McGill University-led study has found.
Researchers found people who either completed 20 minutes of moderate-to-vigorous exercise or took a 90-minute nap performed about 22 per cent better on memory tests after 30 hours without sleep than those who did neither. The findings, published in Proceedings of the National Academy of Sciences (PNAS), point to practical ways to counter the effects of sleep deprivation.
“Sleep loss affects nearly every aspect of how we think and function, but many people can’t simply stop what they’re doing and get more sleep,” said senior author Marc Roig, Professor in McGill’s School of Physical and Occupational Therapy. “Our findings show that even a brief bout of exercise may help preserve one of our most important cognitive abilities.”
The study involved 54 healthy young adults who stayed awake for 30 consecutive hours under lab supervision. Participants were then assigned to one of three groups: a 20-minute cycling session, a 90-minute nap or a control condition. Three days later, researchers tested their memory for images they had viewed immediately after the intervention. Those who exercised or napped remembered significantly more images than participants who did neither.
Same result, different pathways
While the memory benefits were nearly identical, brain recordings revealed that exercise and napping helped in different ways.
Napping appeared to help the brain recharge, making it easier to take in and remember new information. Exercise, by contrast, helped the brain use its remaining resources more efficiently, without making participants feel more tired.
The findings could eventually inform fatigue-management strategies in workplaces where sleep loss is common and mistakes can have serious consequences, such as health care, transportation and emergency response.
“A nap isn’t always possible in the middle of a shift,” said first author Madhura Lotlikar, a doctoral candidate in McGill’s Department of Neurology and Neurosurgery. “Exercise is accessible, inexpensive and easy to implement. That makes it a promising tool to help people stay cognitively sharp when sleep is limited.”
The researchers emphasize that exercise cannot replace sleep, but it may help people function better when getting enough rest isn’t possible.
About the study
“Protecting episodic memory after sleep loss: Similar benefits of exercise and naps via distinct neural contributions” by Madhura Lotlikar and Marc Roig et al., was published in Proceedings of the National Academy of Sciences of the United States of America.
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