Exactly.

Protein and fat turn into blood Sugar much more slowly than carbs do. When your meal has good amounts of protein and fat, your blood Sugar rises more slowly and falls more slowly. You get a softer blood Sugar landing, basically.

If you eat food that's mostly easily absorbed carbs your blood sugar spikes up. Your body will send out a big surge of insulin to handle the big spike and make your blood sugar come plummeting back down. Then your blood sugar will zoom low and undershoot the level you need and your body will urgently try to raise it back up by sending out cortisol.

A high blood sugar concentration is itself damaging, but it takes a while of that for you to notice symptoms, depending on how high it is. But, really it's damaging. Ask diabetics.

Lots of insulin is also damaging.

And making tired adrenals push out cortisol is going to tire them out further, which is probably the most immediately harmful thing for us adrenal fatiguers.