"Mankind was created to walk in divine health as he walked in obedience to the Lord. It is only from his disobedience that sickness and disease came upon him. ...Jesus never sinned and never had sickness until He became sin for us and then took our sickness and disease that we might have His righteousness and health." - Biblical Naturopathy, Rev. Bill Yeary.
Jesus was sinless His whole life. He never experienced sickness or sin while He walked on the Earth. He took on our sins and bore them for us as if He had sinned, but He was perfect and holy. The sins and diseases of the world went with Him to the grave.
Growing up I never felt like Jesus could understand what it was like to have Diabetes (or Celiac or Hashimoto's). After all, He'd never had them while He walked the earth. I'm amazed everyday by what I learn about Him...and I can see that He DOES understand because He took upon Him not only each and every one of our sins, but also each and every disease when He died for us on the cross. That's how much He loves us...how much He wants us to be free from the disease of sin and death in body, spirit, and soul.
"For we do not have a high priest who is unable to sympathize with our weaknesses, but one who in every respect has been tempted as we are, yet without sin." Hebrews 4:15