There is a chronicle and multi system autoimmune disease that affect mostly women of childbearing, systemic lupus erythematosus affects the autoimmunity during pregnancy. This disease can affect the sking, heart, brain, kidneys, even the lungs. Basically, systemic lupus erythematosus affects connective tissues, inflaming them.
Dieting can motivate you. The fact that you are aware of your diet and how it can be a big step can motivate you into exercising and getting to you wanted weight of muscle mass.