Makes Sense To Me

I am still reading the Dr. David Kessler book about overeating and he brings up something that I cannot believe didn’t occur to me before.

As we all have been told—DO NOT cut your calories too drastically because all that happens is your very efficient body just slows your metabolism so you won’t starve to death when there is not plenty of food to eat.  I am actually happy that we have a mechanism like that otherwise our foraging ancestors would have starved to death and I might not have existed.  So that “fail safe” feature is a good thing.

But

why isn’t the reverse true??  If we overeat why doesn’t our metabolism rev up to burn those extra calories??  To my way of thinking this is a major design flaw.  What’s your opinion??