TruXta
tired
Excuse me?According to this someone doing little or no excercise will burn about 83% of their total daily energy expenditure on account of their basal metabolic rate.
And someone extremely active will only burn 52% of their total on account of their BMR.
So, the truth is that the proportion of calories we burn as a result of just sitting around varies between about 50 and 80% (ie quite a lot) depending on the amount of excercise we do. Not "two thirds".