Annual blood tests?

maybe back in the day when i was slaying wh0res
The real question is, how long do you keep up good eating / staying active, until you forget / revert back to your usual habits
On a side note, wasnt there someone on here asking about like full blood / body analysis for like 3-5k or something, who was it and what was the results?
If i recall, most people simply did not even want to know, as it opens a rabbit hole