some religious groups require followers tofast for many hours a day, and continue that fast for days or weeks! isn't not eating for16 hours a day every day dangerous? bom dia earthlings, thanks for stopping bydnews, i'm trace. the holy month of ramadan is wrapping up this week, and those muslimswho have been fasting for 15 hours a day or more will be able to enjoy food anytime again.it's not just muslims who fast, christians, jews, confucians, hindus and other religionshave followed the practice for 1000s of years. non-religious folks fast too, usually formedical or dietary reasons. for some people, the idea of abstaining from food while thesun is in the sky is unfathomable, and they might feel that's it's unsafe! so scienceis here to demystify some fasting myths.
a person is considered to be "fasting" ifthey've abstained from a meal for 8-12 hours, so if you think about it, most people fastevery night -- and break their fast in the morning. that's where the term break-fastcame from. fasting is a completely normal part of being an animal on the planet earth.many organisms eat only once a day or less, especially those eating high-calorie foodslike meats. cold-blooded carnivores, like snakes, can go days between meals, warm bloodedcarnivores, like wolves or coyotes, hunt daily. like the coyote, humans are built to be ableto fast for a short period. a day or so isn't going to hurt you and some studies have shownshort-term fasts can extend lifespan, boost immunity and mental function, and so on. wedid a whole video about that last ramadan.
a study published last month in cell stemcell found that fasting two to four days at a time can cause a reduction in white bloodcells, which is actually a good thing. see, the cells that are killed off are the olderor damaged immune cells, and when the body rebounds, it uses stem cells to create brandnew, healthy ones. long-term fasting, on the other hand, is awhole other beast. when humans fast, our bodies go through a very predictable schedule. ourbodies are great at squirreling away energy in the forms of fats and sugars. but, likecoyotes, ideally, we'd eat every day or so to replenish those reserves. after 24-48 hoursof fasting, the glycogen reserves stored in our liver and muscles -- basically carbohydrates-- are empty. after two days, the body's figured
out that it needs to feed on itself, and willbegin breaking down muscle and fat tissues. obviously, water is important too. 72 hourswithout water is dangerous, so while straight food fasting isn't so bad for you in thisshort a burst, 72 hours is the beginning of medical dehydration. so drink water, no matterwhat. some of you might already be yahoo-ing toget the lowdown on a fasting diet, but the problem is, we don't really work that way.when you fast, you lose a few pounds right away, but it's mainly liquid weight, and itwill be replaced as soon as you eat again. which is another thing, researchers at cornellasked college students to fast for 18 hours, and then offered them a buffet-style meal(not unlike iftar, or community meals after
sundown during ramadan). the most popularfoods were those that were high in calories, carbs and starches, because our cells don'tknow if we're ever going to eat again! therefore, they turn on the cravings for carbs and fatswhich might fend off long-term starvation. but that's silly, you know you're going toeat again! don't listen to your reptilian brain! ideally, a human coming off of a fastwould eat vegetables and fruits. lean meats and a few carbs can be part of the meal, butnot a big part. ultimately, fasting puts stress on the systemsof your body, but low-level stress isn't going to hurt you, and it might build up the systems-- similar to how exercise stress builds muscles. fasting isn't dangerous or deadly, as longas it's done properly and in partnership with
a healthy diet and exercise. if you decide to fast, let us know why andhow you've done it! we're curious. you can fill us in on your journey in thecomments, or send us a tweet at-dnews or me at-tracedominguez. speaking of journeys, ifyou want to know how msl curiosity got to mars, and what the heck it's doing up therecome to our spaceout on july 30th at 4pm pacific time! we're getting experts from nasa jplwho actually work with the rover on mars every sol -- that's martian for day! see you'relearning already! get over there and rsvp. thanks for watching dnews! and please subscribe.[a]
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