Stress always makes me lose my appetite. For me it has turned into anorexia several times when it was long term stress.

I will get very grumpy when hungry & things will escalate into a fight when that happens a lot more often than not.

Also I have just come to understand that studying for me was a lot more difficult all the way through school even getting my BS because I lived in a stressful environment growing up & married into a worse stressful environment. I could barely retain things for a test if I cram studied right before the test. Fast forward.....to the age 54 when I left that marriage & moved to a much less stressful environment alone, I can read & retain & understand so much more than all those years that the stressful situations had been fillubg up my mind & not giving it the space it needed to kearn easier & retain what I learned. Go figure, at 65, I am actually thinking about getting a masters degree because I finally feel capable enough.

Not sure this answers your question but it has been my experience.