Needofinput

Hello, I need some advise, my husband had the surgery one year ago and has done great with his wieght loss. I am very proud of him. But one thing that I have notice is a huge increase in how irritable he is. At first I did not think much of it but it has increased to an intolerable state. I am wondering if it is a chemical imbalance which is cause from not getting the right or enough nutrients. I don't know if I am way off base or what. If someone has any ideas or suggestion please feel free to share.