It's Never Just One Bad Day.
You already know your own pattern by now.
The bloating that builds by evening no matter what you ate. The days that feel fine followed by days that don't. The sense that something in there is working against you, not with you — and that it isn't random, even when it looks that way from the outside.
A single bad day is easy to explain away. A pattern that keeps repeating for months is something else.