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Why dieting dosen't usually work
Three years ago I made one of the best decisions of my life.As my New Years resolution,I gave up dieting,stopped worrying about my weight and learned to eat mindfully.Now I eat whenever I'm humgry,and I've lost 10 pounds.
But I thought I needed to lose weight and when I gained it back,of course I blamed myself.And for the next three decade,I was on and off various diets.No matter what I tried the weight I'd lost always came back.I'm assure many of you know the feeling.As a neuroscientist,wondered why is this so hard?Obviously how much you weight depends on how much eat and how much energy you burn.What most people don't realize is that hunger and energy use are controlled by brain,mostly without your awareness.Your brain dose a lot of its work behind the scenes,and that is a good thing,because your conscious mind,how do we put this politely?it's easily distracted. It's good that you don't have to remember to breathe when you get caught up in a movie.You don't forget how to walk because you are thinking about what to have for dinner.Your brain also has own sense of what you should weight,no matter what you consciously believe.This is called your set point,but that's a misleading term.because it's actually a range of about 10 or 15 pounds.You canuse lifestyle choices to move your weight up and down within that range,but is is much,much harder stay outside of it.
The Hypothalamus,the part of the braid that regulated body weight,there are more than a dozen chemical signals in the brain that tell your body to gain weight,more than another dozen that tell your body to lose it,and the systerm works like a thermostat,responding to signals from the body by adjusting hunder,activity and metabolism,to keep your weight stable as conditions change.That's what a thermostat does,right?It keeps the temperature in your house the same as the weather changes outside.Now you can try to change the temperature in your house of opening a window in the winter,but that's not going to change the setting on the themostat,which will respond by kicking on the furnace to warm the place back up.Your brain works exactly the same way,responding to weight loss by using powerful tools to push your body back to what it considers normal. If you lose a lot of weight,your braid reacts as if you were starving,and whether you started out fat or thin,your brain's response is exactly the same.We would like to think that your brain could tell whether you need to lose weight or not,but it can't if you do lose a lot of weight,you become hundary,and your muscles burn less anergy. Dr.Kudy Leibel of Colombia University has found that people who have lost 10 percent of their body weight burn 250 to 400 calories less because their metabolism is suppressed.That a lot of food. This mean that a successful dieter must eat this much forever than someone of the same weight who has always been thin.From an evolutionary perspective,your body's resistance to weight loss makes sense.When food was scare,our ancestors' survival depended on conserving energy,and regaining the weight when food was available would have protected them againest the next shortage.Over the course of human history,starvation has been a much bigger problem than overeating.This may explain a very sad fact:Set point can go up,but they rarely go down.Now,if your mother ever mentioned that life is not fair,this is the kind of thing she was talking about.Successful dieting doesn't lower your set point.Even after you've kept the weight off for as long as seven years,your braid keeps trying to make you gain it back.If that weight loss had been due to a long famine,that would be a sensible response.In our modern world of drive-thru burgers,it's not working out so well for many of us.That difference between our ancestral past and our abundant present is the reason that Dr.Yoni Freedhoff of the University of Ottawa would like to take some of his patients back to a time when food was les available,and it's also the reason that changing the food environment is really going to be the most effective solution to obesity.Sadly a pemporary weight gain can become permanent.If you stay at a high weight for too long,probably a master of years for most of us,your brain may decide that that's the new normal.Psychologists classify eaters into two groups,those who rely on their hunger and those who try to control their eating through willpower,like most dieter.Let's call them intutuve eaters and controlled eater.The interesteing thing is that intutuve eaters are less likely to be overweight,and they spend less time thinking about food.Controlled eaters are more vulneable to overeating in respinse to advertising,super-sizing and the all you can eat buffet.And a small indulgence,like eating one scoop of ice cream,is more likely t lead to a food binge in controlled eaters.Children are especially vulnerable to this cycle of dieting and then binging.Several long-term studies have shown that girl who diet in their early teenage years are three times more likely to become overweight five year later even if they started at anormal weight,and all of these studies found that the same fasctors that predicted weight gain also predicted the development of eating disorders. The other factor by the way,those of you who are parents,was being teased by family members about their weight.
This is a study that looked at the rist of death over a 14 years period based on four healthy habits:
eating enough fruit and vegatable,exercise three times a week,
not smoking and drinking in moderation
Let's start by looking at the normal weight people in the study. The ones that had no healthy habits had a higher rist of death.Adding just one healthy habit pulls overweigth people back into the normal range.For obese people with no healthy habits, the risk is very high,seven times higher than the healthy groups in the study.But a helathy lifestyle helps obese people too.In fact if you look only at the group with all four healthy habit,you can see that weight makes very little difference.You can take control of your health by taking control of your lifestyle,even if you can't lose weight and keep it off.Diets don't hacve very much reliability.Five years after a diet,most people have regained the weight.Forty percent of them have gained even more.If you think about this,the typical outcome of dieting is that you're more likely to gain weight in the long run than to lose it.
If I've convinced you that dieting might be a problem,the next question is what do you do about it?Any my answer is mindfulness.I'm not saying you need to learn to meditate or take up yoga.I'm talking abolut mindful eating:
Learning to understand your body's signals so that you eat when you're hungry and stop when you're full,because a lot of weight gain boils down to eating when you're not hungry.
How do you do it?Give yourself permission to eat as much as you want and then work on figuring out what makes your body feel good.Sit down to regular meals without distractions.Think about how your body feels when you start to eat and when you stop,and let your hungry decide when you should be done.It took about a year for me to learn this,but it's really been worth it.I am so much more relaxed around food than I have ever been in my life.I often don't think about it.I forget we have chocolate in the house.It's like aliens have taken over my brain.It's just completely different.I should say that this approach to eating probably won't make you lose weight unless you often eat when you're not hundry,but doctors don't know of any approach that makes significant weight loss in a lot of people,and that is why a lot of people are now focusing on preventing weight gain in stead of promoting weight loss.let's face it.If diets worked,we'd all be think already.Why do we keep doing the same thing and expecting different results?Diets may seem harmless,but they actually do a lot of collateral damage.At worst,they ruin lives:
Weight obsession leads to eating disorders especially in young kids.In the U.S.,we have 80 percent of 10-year-old girls say they've been in diet.Our daughters have learned to measure their worth by the wrong scale.Even at its best dieting is a waste of time and energy.It takes willpower which you could be using to help your kids with their homework or to finish that important work project,and because willpower is limited any stragegy that relies on its consisten application is pretty much guaranteed to eventually fail you when your attention moves on to something else.
Let me leave you with one last thought.What if we told all those dieting girls that it's okay to eat when they're hungry?What if we taught them to work with their appetite instead of fearing it?I think most of them would be happier and healthier,and as adults,many of them would probably be thinner.I wish someone had told me that back when I was 13.
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