Grave's Disease is a form of Hypothyroidism, and affects multiple systems in the body. SOme of the more common affected systems or organs include the eyes and skin.
Diseases are all different. Diabetes affects the pancreas, as heart disease affects the heart. Diseases are different, and every one does not effect the same one.
well my sister has crohns disease,and it affects everyone. but to answer your question...it changes their diet so they cant have certain foods,they have to take their meds or whatever they do to...