We have this idea that: 
 If we want to lose weight we joined a gym on January 1 we start working out regularly and eventually be slim down well here's some bad news , I read more than 60 studies on this and 
it turns out exercise is actually pretty useless when it comes to weight
 loss doctor 
Kevin hall at the national institutes of health has done 
some of the most important studies on
 exercise and weight loss we need 
to rebrand exercise exercise in a weight loss tool per/se 
it's excellent
 for health it's probably the best single thing that you can do other 
than 
stopping  smoking to improve your health bites don't look at it as a
 weight loss tool 
exercise will definitely help you live a longer 
happier life 
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  it's just not the best way to lose 
weight and the reason 
has to do with how our bodies use energy you may not realize it but 
physical activity is actually a tiny component of your daily energy 
burns there are 3 main 
ways our bodies burn calories these include your 
resting metabolism so that's how much 
energy your body burns just for 
its basic functioning just to keep you alive basically the 
other part of
 energy expenditures the thermic effect of food and not just how much 
energy
 is required to break food down in your body. Third 
part of energy expenditure is physical 
activity for most people physical
 activity that's any movement you do only accounts for 
about 10 to 30 
percent of energy use so the vast majority of energy or calories you 
burn 
every day comes from your Basil or resting metabolism over which 
you have very little 
control while 100 percent of your calories in are 
up to you only about 30 percent of your 
calories out for in your control
 one study found that if a 200 pound man ran for an hour 4 
days a week 
for a month he lose about 5 pounds at most assuming everything else 
stays the 
same and everything else doesn't stay the same researchers 
have found we make all kinds 
of behavioral and physiological adaptations
 when we start increasing the amount of exercise
 we're getting every day
 for one thing exercise tends to make people hungry and I'm sure 
you 
know the feeling you you go for a spinning class in the morning and then
 by the time 
you breakfast you're so hungry you may be double the size 
of the portion of oatmeal you 
normally eat there's also evidence to 
suggest that some people simply slow down after a 
workout so if you went
 running in the morning you might be less inclined to take the stairs
 at
 work these are called compensatory behaviors they're basically the 
various ways we 
unknowingly undermine our workouts researchers have also
 discovered a phenomenon 
called metabolic compensation as people start 
to slim down the resting metabolism can slow 
 down so the amount of 
energy you burn while at rest is lower that means it this far might 
shrink as you start to lose weight for still a lot of research to be 
done but one study from 
2012 is particularly interesting they went out 
into the middle of the Savannah in Tanzania 
to measure the energy burn 
among a group of hunter gathers called the heads up these are
 super 
active Lina hunter gathers they're not spending their days behind a 
computer at a desk
 and what they found was shocking what we found is 
there is no difference at all so even 
though the how to have a much more
 physically active lifestyle they were burning anymore 
calories every 
day the adults in the U. S. and Europe somehow.    
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The energy 
they used for  physical activity was being offset or conserved elsewhere 
so how did they stay slim they 
don't over eat we can undo the calories 
that we burn off an exercise pretty quickly it would 
take about an hour 
running to burn off the big mac and fries you have to spend about an 
hour dancing pretty vigorously to burn off 3 glasses of wine you might 
drink with dinner 
an hour of cycling really intensely on exercise bikes 
to burn off about 2 donuts and that's
 why exercise is best seen as a 
healthy supplement for a strategy that's focused on food but 
despite extremely high obesity rates in the U. S. government agencies continue 
to present
exercise as a solution as do companies with the real interest
 in making sure we keep eating 
and drinking their products since the 19 
twenties companies like coca Cola have been 
aligning themselves with the
 exercise message the idea here is that you can drink all these 
extra bottles of soda as long as you work out but as we're seeing it doesn't 
work like that 
actually burning off those extra calories from Canistota 
is really really hard we have an 
obesity problem in this country a 
mission to a low physical activity and eating too many 
calories is equally responsible for it public health policy makers should really 
prioritize 
improving our food environment to help people make healthier 
choices about what they eat 
it's not impossible to lose weight through 
exercise it's just a lot harder and we need to 
recognize how that works 
if you do go to the gym the burn all these galleries takes you a 
long 
time to do so and put in a great amount of effort you can erase all of 
that in 5 minutes 
and eating a slice of pizza it's relative magnitude is
 is actually quite surprising and most 
people don't appreciate that.