It depends on what causing it. the only thing I can say is to drink plenty of fluids but I would recommend to go see a doctor, if you are unsure or worried.
Starving yourself will make you lose weight but will also cause bad health. The best diet to lose weight is to drink lots of water and eat fruit. +exercise
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The chickenpox represent a link of an infectious agent
Diet do not work and they only cause more harm than good.