My puzzle-pal Anna is in Rome. She's travelling with her husband Morgan, and they're both architects well versed in Math. She wanted to tell me why she liked Rome so much, but instead of directly telling me, she sent me this riddle.
Not loan and return,
Not always even and odd.
Don't get it? Maybe next month
You should ask my husband.
Don't get too stressed,
Life is yours to live!
Just don't think too far forward,
Or you'll end up a heinous pie!
What was she trying to tell me?
The answer is one word.
Anna is quite the perfectionist.
Hint 2 (to further clarify):
De Morgan's law is required to solve the first two lines. (As deducted by @Rand al'Thor and @M Oehm)
De Morgan's Law state that for two events A and B $\lnot (A \land B) \Rightarrow \lnot A \lor \lnot B$
Which translates to not(A and B) => (not A) or (not B)
If $\lnot A = C$ and $\lnot B = D$
The statement $\lnot A \lor \lnot B = C \lor D$ yes?
Title contains subtle hint.
Hint 4: (based on @Gareth's answer)
If stressed live => evil desserts (heinous pie)
Why didn't I use "Sweets are bad for you" or "Sahara Satan"?
In order to truly find the answer.
I will repeat what I have said.
Don't think too far forward.
And follow the words of the Jedi Master.