from the world's big
Study Challenges 'Safe' Levels of Sugar Consumption
Americans should be aware that sugars subtly creep into their diets through fruit juices, caffeinated beverages, sweetened breakfast foods, and especially sodas. They can, and do, add up.
This article originally appeared in RealClearScience. Read the original here.
By now, we are all likely aware of the harms posed by eating a lot of sugary foods. One simply cannot lead a life laden with desserts, sodas, and sweets and expect to be healthy.
But what, if, like approximately 13 to 25% of Americans, you maintain a healthy diet but indulge in, say, a donut for breakfast, with a grande Starbucks mocha frappuccino later on, and perhaps a 20-ounce soda in the afternoon? That's okay right?
Maybe not. In a new study published in Nature Communications, researchers at the University of Utah have found that comparatively modest levels of sugar consumption in mice can increase female mortality and hinder males' ability to compete.
Beginning at weaning, 156 house mice were fed two different diets. Half were given a diet composed of 25% sugars that was otherwise quite nutritive and healthy. The other mice were fed an identical diet except the sugars were replaced with cornstarch and a very small amount of fiber. After 26 weeks, both sets of mice were divided up equally and placed in six different large enclosures. While in the enclosures, all mice were fed the 25% sugar diet.
For 32 weeks, the researchers observed mouse life in the enclosures. Male house mice are very territorial, and compete for food, mates, and nest sites. The researchers used tracking tags to determine males' territory size and conducted periodical "pup counts" to gauge male and female reproductive success.
Overall, male mice fed the sugary diet controlled 26% fewer territories and sired 25% fewer offspring. Even worse, females on the sugary diet suffered a death rate twice as high as their counterparts on the normal diet!
"The increased rates of mortality and decreased reproduction observed in this study represent the lowest level of added sugar consumption shown to adversely affect mammalian health," the researchers say.
Somewhat counter-intuitively, female mice on the sugary diet gave birth to many more offspring than their normal diet counterparts through twenty weeks of the study, possibly because they had higher fat stores, and thus more energy reserves to be used for lactation and gestation. However, after twenty weeks, their reproductive success sharply declined, and their mortality rates skyrocketed. Thus, looking at the entire duration of the study, females on the two diets had similar levels of reproductive success.
What, if anything, can this research tell us about ourselves? It doesn't appear that there's much to glean on the physiological level. Differences in key measurements of body mass, plasma glucose, insulin, and triglyceride concentrations between the sugar and control mice groups were insignificant. Cholesterol levels were slightly elevated, however. One possible explanation for this dearth of bodily evidence is that 32-weeks is simply not enough time to show significant physiological changes. For humans habitually consuming a moderately sugary diet, deleterious physiological effects may be more pronounced over time. Still, given the data, the researchers couldn't pinpoint a precise mechanism for the drop in fitness and elevation in mortality among sugar-fed mice, making the findings difficult to transfer to humans
The researchers compared the sugary mouse diet to that of a human drinking three cans of soda per day whilst eating an otherwise healthy diet. For reference, those three cans of soda are equal to consuming roughly 125 grams of sugar per day, which is about 1.83 20-ounce sodas or 3.3 tall (12-ounce) mocha frappuccinos from Starbucks.
Recent data from the Centers for Disease Control shows that most Americans are not consuming this much sugar. From 2005 to 2010, approximately 13% of the average American diet came from added sugars like high fructose corn syrup and molasses, well below the 25% level that the mice consumed in the study.
Still, the current research -- though limited in scope -- is a cautionary tale. While the occasional treat or dessert is something to be relished, not feared, Americans should be aware that sugars subtly creep into their diets through fruit juices, caffeinated beverages, sweetened breakfast foods, and especially sodas. They can, and do, add up.
Source: Ruff, J. S. et al. Human-relevant Levels of Added Sugar Consumption Increase Female Mortality and Lower Male Fitness in Mice. Nat. Commun. 4:2245 doi: 10.1038/ncomms3245 (2013).
(Image: Mouse Enclosures via Douglas H. Cornwall, University of Utah)
Image courtesy of Shutterstock
Sallie Krawcheck and Bob Kulhan will be talking money, jobs, and how the pandemic will disproportionally affect women's finances.
How can we promote the creation of new neurons - and why is it so important?
- Neurogenesis, the birth of neurons from stem cells, happens mostly before we are born - as we are formed in the womb, we are generating most of what we need after birth.
- After birth, neurogenesis is still possible in two parts of the brain: the olfactory bulb (which is responsible for our sense of smell) and the hippocampus (which is responsible for memory, spatial navigation, and emotional processing).
- Research from the 1960s proves creating new neurons as adults is possible, and modern-day research explains how (and why) we should promote new neuron growth.
Two parts of the brain can continue growing through neurogenesis<img type="lazy-image" data-runner-src="https://assets.rebelmouse.io/eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpbWFnZSI6Imh0dHBzOi8vYXNzZXRzLnJibC5tcy8yMjkyMzk2NS9vcmlnaW4uanBnIiwiZXhwaXJlc19hdCI6MTYwOTAwODc1MH0.4GDLlZmkwuD0-pJ0s0UWcUoYXMy95a-AM61a_QAlAeA/img.jpg?width=980" id="2e77e" class="rm-shortcode" data-rm-shortcode-id="4e23499fdf3b2185533979083fd02db7" data-rm-shortcode-name="rebelmouse-image" alt="brain made of twigs and plants concept of neurogenesis" />
Neurogenesis is still possible well into adulthood in two very important parts of the human brain.
Image by EtiAmmos on Shutterstock<p>Although most people are aware that aging or bad habits such as heavy alcohol use can contribute to the deterioration of our brains, not many of us give thought to how we can generate new brain cells.</p><p>Neurogenesis, the birth of neurons from stem cells, happens mostly before we are born - as we are formed in the womb, we are generating most of what we need after birth. </p><p><strong>After birth, however, neurogenesis is still possible in two parts of the brain:</strong></p><ul><li>The olfactory bulb, which is a structure of the forebrain that's responsible for our sense of smell. </li><li>The hippocampus, which is a structure of the brain located within the temporal lobe (just above your ears) - this area is important for learning, memory, regulation, of emotions and spatial navigation. </li></ul><p>Of course, when this information first came to light <a href="https://www.ncbi.nlm.nih.gov/pubmed/13860748" target="_blank">back in the 1960s</a>, the next natural question was: How do we promote neurogenesis in those areas where it's still possible? </p><p>Researchers today believe there are activities you can do (some of them may be things you already do on a daily basis) that can promote neurogenesis in your brain. </p><p><strong>Why is it important to promote the growth of new neurons in adulthood?</strong></p><p>We produce an estimated 700 million neurons per day in the hippocampus - this means by the time we reach the age of 50, we will have exchanged the neurons we were born within that area of the brain with new (adult-generated) neurons. </p><p>If we don't promote this exchange with the growth of new neurons, we may block certain abilities these new neurons help us with (such as keeping our memory sharp, for example). </p>
4 ways to promote neurogenesis in your brain<img type="lazy-image" data-runner-src="https://assets.rebelmouse.io/eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpbWFnZSI6Imh0dHBzOi8vYXNzZXRzLnJibC5tcy8yMjkyMzk2Ni9vcmlnaW4uanBnIiwiZXhwaXJlc19hdCI6MTYyNTE3NjczNH0.qyzh_AIUPKfaQIa1QEq4yTNCAAK9nYkH3HFV9vWXwww/img.jpg?width=1245&coordinates=0%2C0%2C0%2C104&height=700" id="64a68" class="rm-shortcode" data-rm-shortcode-id="ee1307fe2dd61ae425552da56db3c5ff" data-rm-shortcode-name="rebelmouse-image" alt="child playing trumpet concept of learning a new instrument neurogenesis" />
Learning a new instrument helps promote neurogenesis.
Photo by DenisProduction.com on Shutterstock<p><strong>Intermittent fasting</strong></p><p><a href="https://law.stanford.edu/2015/01/09/lawandbiosciences-2015-01-09-intermittent-fasting-try-this-at-home-for-brain-health/" target="_blank">A 2015 Stanford study</a> examined the link between <a href="https://www.healthline.com/nutrition/6-ways-to-do-intermittent-fasting#section1" target="_blank">intermittent fasting</a> and neurogenesis. Calorie restriction and fasting can not only increase synaptic plasticity and promote neuron growth but it can also decrease your risk of developing neurodegenerative diseases and boost cognitive function. </p><p><u>Two of the most common ways you can intermittently fast are: </u></p><ul><li>16 hours per day every day - this is a method where you are able to eat for an 8 hour period of the day and fast for 16 hours of the day. Many people begin their "fast" after dinner, pushing their morning meal far enough towards lunch that most of their "off" eating time happens while they are asleep anyways. </li></ul><ul><li>24 hours every week - this is a method where once a week you fast for an entire day. Some people prefer this method because the rest of the week can resume as normal - but for many, this is a difficult way to fast. </li></ul><p><strong>Traveling to new places</strong></p><p>While traveling is something many of us enjoy — scenic routes and new fun experiences — these things also promote neurogenesis while we're on vacation. <a href="https://www.chicagotribune.com/travel/ct-xpm-2014-01-28-sc-trav-0128-travel-mechanic-20140128-story.html" target="_blank">Paul Nussbaum</a>, a clinical neuropsychologist at the University of Pittsburgh, explains that the mental benefits of traveling are very clear.<br></p><p><em>"When you expose your brain to an environment that's novel and complex or new and difficult, the brain literally reacts. Those new and challenging situations cause the brain to sprout dendrites (dangling extensions) which grow the brain's capacity." </em></p><p><strong>Learning a new instrument</strong></p><p>The mental health benefits of music have long been studied, but did you know that learning a new instrument can promote new neuron growth? </p><p>According to <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2996135/" target="_blank">this 2010 study</a>, learning to play a new musical instrument is an intense, multisensory motor experience that requires that acquisition and maintenance of skills over your entire lifetime - which of course, promotes the new formation of new neural networks. </p><p>When is the best time to begin learning a new instrument? Childhood, of course. </p><p><em>"Learning to play a new musical instrument in childhood can result in long-lasting changes in brain organization," </em>according to the study mentioned above. </p><p>While learning an instrument in adulthood will also promote neurogenesis, children who began training with a musical instrument before the age of 7 have shown that they have a significantly larger corpus callosum (the area of the brain the allows communication between the two hemispheres of the brain) than many adults. </p><p><strong>Reading novels</strong></p><p>A study from <a href="http://esciencecommons.blogspot.com/2013/12/a-novel-look-at-how-stories-may-change.html" target="_blank">Emory University</a> showed there was an increase in ongoing connectivity in the brains of participants after reading the same (fiction) novel. </p><p>In this study, enhanced brain activity was observed in the region that control physical sensations and movement. Reading a novel, according to lead researcher Gregory Berns, can transport you into the body of the protagonist. </p><p>This ability to shift into another mental state is a vital skill that promotes healthy neurogenesis in those areas of the brain. </p>
The coronavirus pandemic has brought out the perception of selfishness among many.
- Selfish behavior has been analyzed by philosophers and psychologists for centuries.
- New research shows people may be wired for altruistic behavior and get more benefits from it.
- Crisis times tend to increase self-centered acts.
Paul Krugman on the Virtues of Selfishness<div class="rm-shortcode" data-media_id="7ZtAkm6C" data-player_id="FvQKszTI" data-rm-shortcode-id="828936bf6953080e9018307354c0c02b"> <div id="botr_7ZtAkm6C_FvQKszTI_div" class="jwplayer-media" data-jwplayer-video-src="https://content.jwplatform.com/players/7ZtAkm6C-FvQKszTI.js"> <img src="https://cdn.jwplayer.com/thumbs/7ZtAkm6C-1920.jpg" class="jwplayer-media-preview" /> </div> <script src="https://content.jwplatform.com/players/7ZtAkm6C-FvQKszTI.js"></script> </div> The Nobel Prize-winning economist on the virtues of selfishness.
Evolution Is Moving Us Away from Selfishness. But Where Is It Taking ...<div class="rm-shortcode" data-media_id="cyeqmYCb" data-player_id="FvQKszTI" data-rm-shortcode-id="6c5efecb56456e9acc25cf36935b1826"> <div id="botr_cyeqmYCb_FvQKszTI_div" class="jwplayer-media" data-jwplayer-video-src="https://content.jwplatform.com/players/cyeqmYCb-FvQKszTI.js"> <img src="https://cdn.jwplayer.com/thumbs/cyeqmYCb-1920.jpg" class="jwplayer-media-preview" /> </div> <script src="https://content.jwplatform.com/players/cyeqmYCb-FvQKszTI.js"></script> </div>
Exploring Morality and Selfishness in Modern Times<div class="rm-shortcode" data-media_id="02eX1Cag" data-player_id="FvQKszTI" data-rm-shortcode-id="45cc6180db791f32683988fb52faff26"> <div id="botr_02eX1Cag_FvQKszTI_div" class="jwplayer-media" data-jwplayer-video-src="https://content.jwplatform.com/players/02eX1Cag-FvQKszTI.js"> <img src="https://cdn.jwplayer.com/thumbs/02eX1Cag-1920.jpg" class="jwplayer-media-preview" /> </div> <script src="https://content.jwplatform.com/players/02eX1Cag-FvQKszTI.js"></script> </div> Philosopher Peter Singer discusses the state of global ethics.
Parenting could be a distraction from what mattered most to him: his writing.
Ernest Hemingway was affectionately called “Papa," but what kind of dad was he?