system
Given the following post, respond as if you're commenting on Reddit:
human
Do we keep our atoms as we age?(more questions inside)

1.Are there any atoms which stay with us for life?
2.How do we loose atoms?
3.We gain atoms from vitamins an stuff from food right?

first time posting here :S
sorry if they are stupid questions or if there is no way of knowing the answer. just i always wondered.
gpt
You are correct in assuming you gain atoms through ingestion, but also through respiration.

There are likely atoms that stay with you for life, or close to it.

An example would be ova (egg cells in women's ovaries) which go into suspended animation in a fetus.  Some of them stay in that state for decades, until menopause after 50 or so (average).

It is imposible to know this for sure, without tagging every single atom in your body with a unique tag of some sort, an impossibility.