NewsMakers
Breastfeeding protects against type 1 diabetes but cow’s milk raises risk, research suggests
Babies that were breastfed for longer and those that were breastfed exclusively were less likely to develop T1D.
New research presented at the Annual Meeting of the European Association for the Study of Diabetes (EASD), held online this year, shows that breastfeeding is associated with a lower risk of developing type 1 diabetes (T1D). Drinking more than two or three glasses of cow’s milk a day in childhood, however, is linked with higher odds of developing T1D.
In T1D, the immune system attacks and destroys the insulin-producing cells in the pancreas. This prevents the body from producing enough of the hormone to properly regulate blood sugar levels.
What triggers the immune system’s attack is unknown but is thought to involve a combination of a genetic predisposition and an environmental trigger such as a virus or foodstuff. In some cases, the condition may develop in people without a genetic predisposition.
Incidence of T1D, the most common form of diabetes in children, is increasing worldwide. The number of diagnoses in young people is rising by an estimated 3.4% annually in Europe and 1.9% in the U.S.
“Type 1 diabetes is a serious condition that requires lifelong treatment,” says Ms Anna-Maria Lampousi of Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden, who led the research. “Over time, high blood sugar levels can damage the heart, eyes, feet and kidneys and can shorten life expectancy.
“Learning more about the causes is key to preventing the type 1 diabetes – and its complications.
“The identification of foodstuffs and other environmental triggers which can be modified would be particularly valuable.”
Numerous foodstuffs have been linked to islet autoimmunity – the attack on the insulin-producing cells – and T1D but none of the associations have been firmly established and the existence of a link remains controversial.
In the first study of its kind, Ms Lampousi and colleagues at the Karolinska Institutet carried out a systematic review and meta-analysis of the existing research to identify which foods have been consistently linked to T1D.
The Medline, Embase and Cochrane Library databases were searched from formation until October 2020, for studies on diet, T1D and islet autoimmunity.
Of the 5,935 studies identified, 152 were eligible for inclusion. The analysis produced estimates for how much 27 dietary components increased or reduced the risk of developing T1D. This included foods eaten by the mother in pregnancy and foods consumed in infancy and childhood, as well as being breastfed.
Babies that were breastfed for longer and those that were breastfed exclusively were less likely to develop T1D.
Those breastfed for at least 6-12 months were less than half as likely (61% less likely) to develop T1D than those breastfed for less. Those given only breast milk for the first 2-3 months were 31% less likely to develop the condition than those who weren’t exclusively breastfed.
The researchers say that breastfeeding promotes the maturation of baby’s immune system. Plus, breast milk enhances the baby’s gut microbiota – the bacteria, fungi and other microorganisms that live in the digestive tract and help regulate the immune system.
Higher consumption of cow’s milk and dairy products such as butter, cheese, yoghurt and ice-cream during childhood (under 15 years old) was associated with a higher risk of islet autoimmunity and T1D.
For example, those who drank at least two to three glasses of cow’s milk (one glass = around 200ml) a day were 78% more likely to be develop T1D than those who consumed less than this amount of milk.
It isn’t known what is behind the association but some research has suggested that amino acids (the building blocks of proteins) in cow’s milk can trigger the immune system’s attack on the insulin-producing cells of the pancreas.
Early introduction of cow’s milk to the diet was also associated with a higher risk of T1D. Those who started drinking cow’s milk at two or three months old were 31% less likely to develop T1D than those who started consuming it earlier.
Later introduction of gluten to the diet more than halved the odds of developing T1D. Infants who started eating gluten-containing foods, such as cereal, bread, pastries, biscuits and pasta, at 3-6 months old were 54% less likely to develop T1D than those introduced to the foods earlier.
Waiting until a child was four to six months old to introduce fruit to their diet was associated with a 53% reduction in their likelihood of developing T1D.
The study’s authors say it isn’t clear if delaying introduction to these foods directly protects against T1D or if the infants are benefiting from being breastfed for longer.
Age at introduction to formula milk, meat and vegetables was not linked to risk of T1D. Nor were there any associations between a mother’s intake of gluten and vitamin D in pregnancy and her child’s odds of the condition.
Ms Lampousi concludes: “Diet in infancy and childhood may influence the risk of type 1 diabetes. The strongest findings were for the beneficial effects of breastfeeding and the harmful effects of early introduction to cow’s milk, gluten and fruit.
“However, most of the evidence to-date is of limited quality and further high-quality research is necessary before any specific dietary recommendations can be made.”
NewsMakers
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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