system
Given the following post, respond as if you're commenting on Reddit:
human
We’ve now discovered that spending a year in space can change your DNA - What does this change about what we thought we knew about DNA?
gpt
Nothing really.

We already knew different genes can express differently depending on the type of stress the individual is in.

Frequent or long term starvation/malnutrition for example can result in pronounced changes to how the body handles growth and development. It's one of the reasons why when a society transitions to one in which food is consistently readily available, average height of the population increases each generation for a while.

So the "change in DNA" touted is a predictable result of the unique long term stress of weightlessness. A cool headline, but something we expected before we ever sent him up.