You are 100% correct that we as a society have a problem with this
That's why the individual has to take extra care to eat right and excersise. Their doctor needs to emphasize this as much as possible.
VCan we fix out society? I don't know, I sure hope so. But in the meantime people are responsible for their own health.
It's being reliant on medication - that's a problem for any combat role
Like if you are 100% reliant on Adderall in order to function, you cannot be in a combat role.