Everyone knows we convert food into energy and use it to grow - the 'stuff' that is food, is converted by our bodies into mass - some people are very very successful at this.
When we're conceived, it's a contribution by the father and mother that gets us started - and the building blocks of that were the foods they ate, the drinks they drank.
What about when we die..? Well our stuff goes back into the ground or atmosphere and the cycle begins anew.
So is anything 'new'? Yes and no. New forms of matter are created (from other forms). Think about high school science and the table of elements. Our bodies create muscle, fat, bones, ligaments and so on from what we consume. Extra stuff is discarded as waste.
Is there ever a time when we create new matter..? No, everything we're made of was always here*. It wasn't in this form, but every atom that we are, that is around us - the ground, the trees the birds and sky - it was here in the beginning in some perhaps more basic form such as Helium or Hydrogen. Thanks to element producing factories such as stars, it's been transformed and we're possible. Of course there's lots more to it...but it does make you wonder.
Hold up your right hand, look at it closely. Where do you think the atoms that make it up were, before you were using them ?
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