No one should ever use up their entire daily supply of energy. The human body shouldn’t be pushed to the extreme like that.
Healthy people rarely reach their energy limit. You tend to only really see them close to collapse with exhaustion after extreme events like marathons.
Our daily energy supply is far less. So of course it is easier to reach the bottom of it far, far quicker. The vomiting from exhaustion that you sometimes see with marathon runners? I get close to that when taking a shower. So I hit my energy limit surprisingly early if you compare me to others.
But if there’s someone who expects me to push and push until my supply is gone, my response would be why should I, when they don’t?
My energy supply is Less but I am not. I value myself and my body too much to ask more of it than is safe or sensible to give. Why should I use more than is safe for me do so, just because it’s inconvenient to others if I don’t?
I would never expect them to use up their entire supply like that.
Stop measuring us according to your one size fits all energy scale.
M.E. myself and I 
I have just found your blog and read a few posts. This one has really resonated! I have never thought of it that way and will certainly use the marathon example to remind myself I am not lazy. Thanks!!
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