Can you tell me about post gastric bypass depression ?

Dep. postop.: Some causes might be the very low calorie diet after surgery, leading to low carbohydrates in diet, which alters Serotonin levels ( less Carbohydrates leads to less Insulin leading to less Tryptophan entering the brain, hence less Serotonin formed, hence more depression & anxiety & fatigue).

Before, and after.: Gastric bypass patients are often anxious and depressed about their weight before the procedure. And after the procedure is completed anxiety and depression can still be experienced. What's the reason? The feelings arise from finally attaining what they seek. Reworded, we careful of what you ask for: you just might get it. Then what?