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Why a high fat diet could reduce the brain’s ability to regulate food intake

Calorie intake is regulated in the short-term by cells called astrocytes (large star-shaped cells in the brain that regulate many different functions of neurons in the brain) that control the signalling pathway between the brain and the gut. Continuously eating a high fat/calorie diet seems to disrupt this signalling pathway.

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Regularly eating a high fat/calorie diet could reduce the brain’s ability to regulate calorie intake. New research in rats published in The Journal of Physiology found that after short periods of being fed a high fat/high calorie diet, the brain adapts to react to what is being ingested and reduces the amount of food eaten to balance calorie intake. The researchers from Penn State College of Medicine, US, suggest that calorie intake is regulated in the short-term by cells called astrocytes (large star-shaped cells in the brain that regulate many different functions of neurons in the brain) that control the signalling pathway between the brain and the gut. Continuously eating a high fat/calorie diet seems to disrupt this signalling pathway.

Understanding the brain’s role and the complex mechanisms that lead to overeating, a behaviour that can lead to weight gain and obesity, could help develop therapies to treat it. Obesity is a global public-health concern because it is associated with increased risk of cardiovascular diseases and type 2 diabetes. In England, 63% of adults are considered above a healthy weight and around half of these are living with obesity. One in three children leaving primary school are overweight or obese1.

Dr Kirsteen Browning, Penn State College of Medicine, US, said, “Calorie intake seems to be regulated in the short-term by astrocytes. We found that a brief exposure (three to five days) of high fat/calorie diet has the greatest effect on astrocytes, triggering the normal signalling pathway to control the stomach. Over time, astrocytes seem to desensitise to the high fat food. Around 10-14 days of eating high fat/calorie diet, astrocytes seem to fail to react and the brain’s ability to regulate calorie intake seems to be lost. This disrupts the signalling to the stomach and delays how it empties.”

Astrocytes initially react when high fat/calorie food is ingested. Their activation triggers the release of gliotransmitters, chemicals (including glutamate and ATP) that excite nerve cells and enable normal signalling pathways to stimulate neurons that control how the stomach works. This ensures the stomach contracts correctly to fill and empty in response to food passing through the digestive system. When astrocytes are inhibited, the cascade is disrupted. The decrease in signalling chemicals leads to a delay in digestion because the stomach doesn’t fill and empty appropriately.

The vigorous investigation used behavioural observation to monitor food intake in rats (N=205, 133 males, 72 females) which were fed a control or high fat/calorie diet for one, three, five or 14 days. This was combined with pharmacological and specialist genetic approaches (both in vivo and in vitro) to target distinct neural circuits. Enabling the researchers to specifically inhibit astrocytes in a particular region of the brainstem (the posterior part of the brain that connects the brain to the spinal cord), so they could assess how individual neurons behaved to studying rats’ behaviour when awake.

Human studies will need to be carried out to confirm if the same mechanism occurs in humans. If this is the case, further testing will be required to assess if the mechanism could be safely targeted without disrupting other neural pathways.

The researchers have plans to further explore the mechanism. Dr Kirsteen Browning said, “We have yet to find out whether the loss of astrocyte activity and the signalling mechanism is the cause of overeating or that it occurs in response to the overeating. We are eager to find out whether it is possible to reactivate the brain’s apparent lost ability to regulate calorie intake. If this is the case, it could lead to interventions to help restore calorie regulation in humans.”

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Pru Life UK agents, customers, executives celebrate Year of the Wood Dragon

The insurer maintains its top position in New Business Annual Premium Equivalent & total Premium Income from Variable Life Insurance products according to the Insurance Commission’s Life Insurance Sector Quarterly Statistics for Q3 2023.

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With a strengthened commitment to providing better financial protection for every Filipino, Pru Life UK celebrates the start of the Year of the Wood Dragon. Over 200 Pru Life UK leaders, agents, clients, and employees joined and wished everyone PRU Love during the festivities held at the heart of its Escolta branch in Binondo Manila.

The insurer maintains its top position in New Business Annual Premium Equivalent & total Premium Income from Variable Life Insurance products according to the Insurance Commission’s Life Insurance Sector Quarterly Statistics for Q3 2023.

Pru Life UK’s products are made accessible through its over 42,000 digitally-empowered agency workforce and like-minded partners.

The Company recently launched PRULove for Life – an affordable, limited-pay, whole-life participating plan for as low as Php 87 per day* with lifetime coverage up to age 100 and flexible payment terms of 5, 10, 15, or 20 years to pay. To know more about PRULove for Life, talk to your Pru Life UK agent today or visit Pru Life UK’s website.

Pru Life UK is also committed to driving up financial awareness, literacy, and inclusion in the country by leading industry discussions and programs for the community. Its PRUBabies campaign seeks to protect 175,000 newborns with free insurance coverage against select infectious diseases such as Dengue, Typhoid, Measles, and Malaria.

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Eating too much protein is bad for your arteries, and this amino acid is to blame

Consuming over 22% of dietary calories from protein can lead to increased activation of immune cells that play a role in atherosclerotic plaque formation, driving the disease risk.

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University of Pittsburgh School of Medicine researchers discovered a molecular mechanism by which excessive dietary protein could increase atherosclerosis risk. The findings were published in Nature Metabolism.

The study, which combined small human trials with experiments in mice and cells in a Petri dish, showed that consuming over 22% of dietary calories from protein can lead to increased activation of immune cells that play a role in atherosclerotic plaque formation, driving the disease risk. Furthermore, the scientists showed that one amino acid – leucine – seems to have a disproportionate role in driving the pathological pathways linked to atherosclerosis, or stiff, hardened arteries.

“Our study shows that dialing up your protein intake in pursuit of better metabolic health is not a panacea. You could be doing real damage to your arteries,” said senior and co-corresponding author Babak Razani, M.D., Ph.D., professor of cardiology at Pitt. “Our hope is that this research starts a conversation about ways of modifying diets in a precise manner that can influence body function at a molecular level and dampen disease risks.”

According to a survey of an average American diet over the last decade, Americans generally consume a lot of protein, mostly from animal sources. Further, nearly a quarter of the population receives over 22% of all daily calories from protein alone.

That trend is likely driven by the popular idea that dietary protein is essential to healthy living, says Razani. But his and other groups have shown that overreliance on protein may not be such a good thing for long-term health.

Following their 2020 research, in which Razani’s laboratory first showed that excess dietary protein increases atherosclerosis risk in mice, his next study in collaboration with Bettina Mittendorfer, Ph.D., a metabolism expert at the University of Missouri, Columbia, delved deeper into the potential mechanism and its relevance to the human body.

To arrive at the answer, Razani’s laboratory, led by first-authors Xiangyu Zhang, Ph.D., and Divya Kapoor, M.D., teamed up with Mittendorfer’s group to combine their expertise in cellular biology and metabolism and perform a series of experiments across various models – from cells to mice to humans.

“We have shown in our mechanistic studies that amino acids, which are really the building blocks of the protein, can trigger disease through specific signaling mechanisms and then also alter the metabolism of these cells,” Mittendorfer said. “For instance, small immune cells in the vasculature called macrophages can trigger the development of atherosclerosis.”

Based on initial experiments in healthy human subjects to determine the timeline of immune cell activation following ingestion of protein-enriched meals, the researchers simulated similar conditions in mice and in human macrophages, immune cells that are shown to be particularly sensitive to amino acids derived from protein.

Their work showed that consuming more than 22% of daily dietary calories through protein can negatively affect macrophages that are responsible for clearing out cellular debris, leading to the accumulation of a “graveyard” of those cells inside the vessel walls and worsening of atherosclerotic plaques overtime. Interestingly, the analysis of circulating amino acids showed that leucine – an amino acid enriched in animal-derived foods like beef, eggs and milk – is primarily responsible for abnormal macrophage activation and atherosclerosis risk, suggesting a potential avenue for further research on personalized diet modification, or “precision nutrition.”

Razani is careful to note that many questions remain to be answered, mainly: What happens when a person consumes between 15% of daily calories from protein as recommended by the USDA and 22% of daily calories from protein, and if there is a ‘sweet spot’ for maximizing the benefits of protein – such as muscle gain – while avoiding kick-starting a molecular cascade of damaging events leading to cardiovascular disease.

The findings are particularly relevant in hospital settings, where nutritionists often recommend protein-rich foods for the sickest patients to preserve muscle mass and strength.

“Perhaps blindly increasing protein load is wrong,” Razani said. “Instead, it’s important to look at the diet as a whole and suggest balanced meals that won’t inadvertently exacerbate cardiovascular conditions, especially in people at risk of heart disease and vessel disorders.”

Razani also notes that these findings suggest differences in leucine levels between diets enriched in plant and animal protein might explain the differences in their effect on cardiovascular and metabolic health. “The potential for this type of mechanistic research to inform future dietary guidelines is quite exciting,” he said.

Additional authors of the study are Yu-Sheng Yeh, Ph.D., also from Pitt; Alan Fappi, Ph.D. and Vasavi Shabrish, Ph.D., both of the University of Missouri, Columbia; Se-Jin Jeong, Ph.D., Jeremiah Stitham, M.D., Ph.D., Ismail Sergin, Ph.D., Eman Yousif, M.D., Astrid Rodriguez-Velez, Ph.D., Arick Park, M.D., Ph.D., Joel Schilling, M.D., Ph.D., Marco Sardiello, Ph.D., Abhinav Diwan, M.D., Nathan Stitziel, M.D., Ph.D., Ali Javaheri, M.D., Ph.D., Irfan Lodhi, Ph.D., and Jaehyung Cho, Ph.D., all of Washington University School of Medicine, St. Louis; Arif Yurdagul Jr, Ph.D., and Oren Rom, Ph.D., both of the Louisiana State University Health Sciences Center; and Slava Epelman, M.D., Ph.D., of the University of Toronto.

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IRONKIDS Cebu in Lapu-Lapu partners with RLC Residences

This April will be the first event of the partnership as the brand extends their support for the budding young athletes. The aquathlon will see participants from ages 6 to 15 years old complete the race happening at The Reef Island Resort in Mactan.

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The IRONMAN Group Philippines and RLC Residences have announced in 2023 a new partnership—as the residential brand of Robinsons Land Corporation, RLC Residences becomes the title sponsor for IRONKIDS Lapu-Lapu and IRONKIDS Davao for 2024.

This April will be the first event of the partnership as the brand extends their support for the budding young athletes.  The aquathlon will see participants from ages 6 to 15 years old complete the race happening at The Reef Island Resort in Mactan.

RLC Residences Head of Brand Management Mr. Dan Carlo Torres shares his enthusiasm towards the event. “We are very excited to see this partnership unfold. We’ve been very supportive of IRONMAN, especially IRONKIDS because we also believe in the importance of promoting an active and purposeful lifestyle at such a young age and we hope to continuously be part of IRONMAN as we create more vibrant opportunities for our future triathletes,” he added.

“As we aspire to live our best lives, we work to inspire the wider community,” said Ms Princess Galura, Regional Director of the IRONMAN Group Philippines.  “For 10 years, the IRONKIDS has been a part of the Cebuano youth’s stepping stone to either a future in sports, representing the Philippines in international events, as well as planting the seeds of a healthy, sporty lifestyle.  Our partnership with RLC Residences allows us to do so and we are excited to hold the festivities for our youth once again in Lapu-Lapu this April,” she added.

The IRONKIDS event in Lapu-Lapu will feature age group categories for the 6 to 8 years old, 9 to 10 years old, 11 to 12 years old and 13 to 15 years old.  Relay categories are also available for mixed team relay for 6-10 year-olds and 11-15 year-olds. 

Swim and run courses, the transition area and finish line will be at The Reef Island Resort, which is conveniently located in a gated community.  Families who are checked in during race weekend can enjoy amenities of the resort –  including the beach, lap pool and game room.  The resort’s restaurant is operated by Cebu-based top tier chain, Abaca.

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