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Patients, physicians should take note of ethnicity-specific Body Mass Index (BMI) guidelines
Since BMI originated with the measurements of European men, we know that it leaves a wide range of people out of the equation.
While body mass index (BMI) as a body composition assessment tool has long had its critics, recent research has highlighted a new potential drawback in that it could prevent people of certain ethnicities from having their risk for Type 2 diabetes assessed earlier. A psychologist and weight management specialist at a top American hospital, Cleveland Clinic, stresses the importance of physicians and patients being aware of different cut-off points based on their ethnicity.
Leslie Heinberg, PhD, MA, explains that recently, researchers in the U.K. discovered that the cutoff BMI number associated with a higher risk of Type 2 diabetes varies between different patient populations. For example, a BMI of 30 or above was linked to a higher risk for white people. For Black people, the cutoff number was 28 or above. For South Asian people it was 23.9 or above and for the Middle Eastern population, the BMI cutoff was 26 or above.
The problem? Some healthcare providers might only be making recommendations for diabetes-related lifestyle changes or treatment options based on the risk level for white people. This means that other populations might not get the medical interventions they need in time.
Here, Dr. Heinberg, explains why BMI is still used and gives some tips for how people of color can make sure they’re on the right track despite the discrepancies.
Where did BMI come from?
The formula for calculating body mass was the creation of a Belgian mathematician, astronomer, sociologist and statistician named Lambert Adolphe Jacques Quetelet. Quetelet wasn’t focused on studying obesity when he developed what was first known as the “Quetelet Index” (your weight in kilograms divided by the square of your height in meters, or Kg/M²). He was looking at years of crime data that he compiled to link crime to social conditions. In doing so, he noticed a relationship between an adult’s height and weight.
In 1972, American physiologist Ancel Keys gave the Quetelet Index a new name as he thought the formula was a good way to identify obesity. He referred to it as the body mass index.
“It’s a ratio that takes height into account because taller people weigh more than shorter people,” says Dr. Heinberg. “It was developed more for actuarial tables and to determine which people are at a higher risk for mortality. It’s something that makes sense when you look at a very large population.”
Dr. Heinberg adds that today, many organizations and businesses still rely on BMI when it comes to providing things like insurance or medical procedures.
The drawbacks of BMI
Dr. Heinberg says that BMI can be a pretty blunt instrument for health because it leaves a lot of physical attributes out of the equation.
“It doesn’t take into account a lot of things about an individual. You can ask somebody for their height and weight and it becomes a very easy assessment in comparison to a full and comprehensive evaluation. When we think about an individual’s health and their health risks, taking their background information into account is helpful. But when you’re looking at a million people, you just can’t do that.”
Other physical signs of health risks
While BMI is one way of measuring risks, Dr. Heinberg says there are other physical clues to watch out for.
“We do know things like waist circumference, waist-to-hip ratio and where you hold excess weight might play an even more important role when it comes to metabolic diseases,” she says.
For instance, if you have an apple body shape or a pear shape, the excess abdominal weight of an apple shape is associated with more cardiovascular risks and metabolic disease. “Also, with things like obstructive sleep apnea, neck circumference seems to be important. It all goes way beyond just BMI.”
How people can advocate for their health
Since BMI originated with the measurements of European men, we know that it leaves a wide range of people out of the equation. However, since it is just one piece of information, Dr. Heinberg recommends getting the full picture of your health.
“What’s helpful about this study is that it helps illustrate that BMI should not just be used to determine if someone is healthy, unhealthy, lean or obese. Instead, it should be considered as another vital sign. If a provider sees someone with an elevated BMI, particularly if they are from a population that is at higher risk for Type 2 diabetes, that should suggest doing some lab work and making additional assessments. It would also be good to discuss any factors that can keep a patient out of that pre-diabetic or full diabetic range.” These factors might include sleep habits, stress management, dietary changes and increased physical activity.
If you already know that your family has a history of diabetes, high blood pressure or other health concerns, discuss it with your provider. The more information they have, the better equipped they are to monitor your health and help you manage any conditions.
The main thing to keep in mind about BMI
Dr. Heinberg says the other important message when it comes to BMI or weight is that you do not have to lose a large amount of weight to improve your health.
“There’s this unfortunate message that everyone has to be within this little window. But even a small amount of weight loss — around 2.5kg to 4.5kg — is associated with really significant improvements in metabolic risk or cardiovascular risk.”
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Heart disease risk may start in the womb, study finds
Young adults whose mothers had high blood pressure during pregnancy — either pregnancy-associated hypertension, pre-eclampsia or eclampsia — had more signs of early arterial injury, higher blood pressure, higher body mass index and higher blood sugar than peers.
A child’s future heart health may be partially shaped before they are born, reports a new Northwestern Medicine study that found pregnancy complications are linked to poorer cardiovascular health in offspring more than 20 years later.
The study found that young adults whose mothers had high blood pressure during pregnancy — either pregnancy-associated hypertension, pre-eclampsia or eclampsia — had more signs of early arterial injury, higher blood pressure, higher body mass index and higher blood sugar than peers.
The authors said the study adds to growing evidence that cardiovascular risk may be transmitted across generations through a combination of biological, environmental and behavioral factors.
“That means we must make sure people maintain good health from childhood into young adulthood, so that if or when someone becomes a parent, they pass on the best opportunity for good health to their children,” said study senior author Dr. Nilay Shah, assistant professor of medicine in the division of cardiology at Northwestern University Feinberg School of Medicine.
How the study was conducted
Shah and colleagues evaluated nearly 1,350 mother-child pairs from the Future of Families and Child Well-Being Study, which enrolled mothers and children at birth between 1998 and 2000 across 20 U.S. cities. The children were then followed into adulthood.
Using delivery hospitalization records, the Northwestern scientists first identified whether mothers experienced pregnancy complications, including high blood pressure during pregnancy, gestational diabetes (high blood sugar during pregnancy) or preterm birth (before 37 weeks of pregnancy).
The three pregnancy complications are on the rise, and affect almost one in four pregnancies in the U.S.
The research team then analyzed cardiovascular health of offspring at age 22, using blood pressure measurements, blood testing, body mass index assessments and carotid artery ultrasounds to look for signs of artery injury.
Finally, the scientists compared participants with and without exposure to each pregnancy complication and adjusted for factors like income, education, difference in birth weight and smoking during pregnancy.
Key findings
At around age 22, participants whose mothers had high blood pressure during pregnancy had:
- Higher body mass index (+2.8 BMI points)
- Higher diastolic blood pressure (+2.3 mm Hg)
- Higher blood sugar levels (+0.2% HbA1c)
- Thicker artery walls (~0.02 mm)
While the difference in artery wall thickness may seem small, the study authors said it corresponds to roughly three to five years of additional vascular aging. That means arteries looked older and less healthy than expected, which raises the risk of future heart disease.
Other pregnancy complications also showed some long-term effect:
- Exposure to gestational diabetes was linked to worse blood pressure and some evidence of artery thickening
- Being born preterm was associated with higher blood sugar levels
‘Most heart disease is preventable’
With pregnancy complications on the rise in the U.S., Shah said the study provides compelling evidence that improving health before and during pregnancy could help reduce heart disease risk in the next generation.
“There is evidence that both parents’ health at the time of conception and during pregnancy influences a child’s health,” he said. “So, promoting health from an early age, like exercising regularly, eating healthfully, never smoking and getting enough sleep, is not just meant for an individual, but doing so may help future generations be healthier, too.”
Shah also emphasizes that risk is not destiny.
“The good news is that most heart disease is preventable,” he said. “If you experienced high blood pressure or high blood sugar during pregnancy, or your child was born early, it does not absolutely mean that your child will have worse health as adults. But I would encourage you to pay attention now to your child’s health behaviors.
“What children learn in childhood sets the stage for their health across their lives. If you are wondering whether your children’s behaviors are healthy, or are considering making a change, please speak with your child’s pediatrician for advice and guidance.”
Other Northwestern co-authors include Emily Lam, Abigail Gauen, Dr. Sadiya Khan, Alexa Freedman and Norrina Allen.
NewsMakers
Viagra could hold key to halting Peyronie’s disease
Combining two widely prescribed drug classes could provide the first effective treatment for early-stage Peyronie’s disease.
Combining two widely prescribed drug classes could provide the first effective treatment for early-stage Peyronie’s disease, according to a study published in The Journal of Sexual Medicine.
Peyronie’s disease (PD) is caused by the development of fibrotic scar tissue within the penis, leading to pain, curvature, sexual dysfunction and, in many cases, significant psychological distress. It affects an estimated 10 per cent of men during their lifetime, but despite its prevalence, treatment options are limited, particularly in the early phase of the condition.
The study, carried out by Anglia Ruskin University (ARU) and University College London Hospital (UCLH), found that combining phosphodiesterase type 5 (PDE5) inhibitors such as sildenafil (Viagra) and tadalafil (Cialis) with selective oestrogen receptor modulators (SERMs), including tamoxifen, may slow or even stop disease progression when given early.
The clinical study, carried out by Professor David Ralph of UCLH, evaluated outcomes in 133 men diagnosed with acute Peyronie’s disease who were treated with the drug combination for three months. Their results were compared with a smaller group of patients receiving standard care, which included giving vitamin E or no treatment at all. Standard care did not include surgery.
The study found 43 per cent of patients on the combination experienced an improvement in penile curvature, almost three times higher than in the standard‑care group (15 per cent).
At the start of treatment, 65 per cent of patients in the combination group reported pain during erections. After three months, that figure had fallen to just 1.5 per cent. By comparison, pain prevalence in the standard‑care group fell from 50 per cent to 27 per cent.
The clinical findings build on earlier laboratory work led by Professor Selim Cellek at ARU’s Fibrosis Research Group. Over the course of several years, Professor Cellek’s team screened 1,953 FDA‑approved drugs to identify compounds capable of blocking the transformation of fibroblasts into myofibroblasts, the key cells responsible for fibrosis. PDE5 inhibitors and SERMs emerged as particularly effective, and when used together demonstrated an effect greater than either drug alone.
Currently, there are no approved oral therapies proven to prevent early disease progression, forcing patients in the acute phase to wait until the condition stabilises before they can be offered treatments including injections or surgery.
Professor Cellek said: “Positive findings from this pilot clinical study validate our drug‑screening approach in the lab. It shows how repurposing well‑known medicines can accelerate progress in areas of unmet clinical need.
“Because both PDE5 inhibitors and SERMs are already widely used in clinical practice and have established safety profiles, the approach could be readily adoptable if confirmed in larger studies.
“These results suggest that early intervention targeting fibrosis could change how we treat Peyronie’s disease. Repurposing existing drugs may allow us to move from managing symptoms to modifying the disease itself.”
Professor David Ralph, Professor of Urology at UCLH, said: “This paper confirms the basic science research with regards to halting the progression of Peyronie’s disease. In previous papers we have noted that tamoxifen and PDE5 inhibitors inhibit the transformation of fibroblasts into myofibroblasts and therefore contraction of the plaque.
“This has now been put into clinical practice where this paper shows that when tamoxifen and a PDE5 inhibitor are combined, there is statistically less progression of the disease and improvement in curvature compared to the control arm. This is where from bench to clinical practice prevails and hopefully now a prospective clinical trial can be initiated.”
NewsMakers
Healthier brains may be more resilient to early Alzheimer’s disease
Maintaining good overall brain health may help reduce the impact of Alzheimer’s‑related changes on cognitive function.
A healthy brain may help protect thinking and memory skills from the early effects of Alzheimer’s disease, a new study has found.
Dementia is currently the leading cause of death in Australia and Alzheimer’s disease is its most common form — accounting for more than 70% of cases.
Alzheimer’s is a progressive brain disease in which cognitive abilities gradually decline, leading to impaired memory and thinking skills.
However, some people maintain high levels of cognitive function even though their brains show early signs of the disease. Specifically, some older adults have Alzheimer’s‑related brain pathology, but no noticeable cognitive problems.
The study, Cognitive and Brain Reserve as Modifiers of Early Alzheimer Disease–Related Cognitive Vulnerability, was a collaboration between Murdoch University and AdventHealth, and investigated why some people remain cognitively healthy despite early Alzheimer’s‑related brain changes.
“Our study looked at why some brains were more resilient than others, and whether factors such as peoples’ education, socioeconomic status and health of their brain made a difference,” said lead author Dr Kelsey Sewell, from Murdoch University’s School of Allied Health.
“Understanding these protective factors could help us develop earlier and more targeted strategies to minimise the effects of the disease on memory and thinking skills,” she said.
The research team analysed data from more than 600 older adults in the United States aged 65 to 80, who were living independently and had no signs of dementia or memory impairment.
They used blood tests and MRI scans to assess early Alzheimer’s‑related changes and overall brain health, examined life and social factors such as years of education, income, savings and financial security, and conducted cognitive tests measuring memory, attention, processing speed, working memory and executive function.
“Our main finding was that maintaining good overall brain health may help reduce the impact of Alzheimer’s‑related changes on cognitive function,” Dr Sewell said.
“We also observed early evidence that people with a higher socioeconomic status may be less affected by Alzheimer’s-related changes when it comes to memory, although more research is needed to confirm this relationship.”
Dr Sewell said the main takeaway for the public was to do everything you can to maintain a healthy brain.
“Things like exercise, maintaining a healthy diet, sleeping well, and finding new cognitive challenges can help to maintain a healthy brain. It is never too late, or too early to start,” she said .
“These results underscore the need for coordinated action across research, policy, and industry to design environments that support healthier choices and promote brain health at a population level.”
The data collection for this study was led by researchers at AdventHealth in Orlando, Florida.
The paper, Cognitive and Brain Reserve as Modifiers of Early Alzheimer Disease–Related Cognitive Vulnerability, was published in the journal Neurology.
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