In the time of dieting health insurance is essential or not?

I am in a big trouble.I am a fat guy with 220 pounds. Now I am trying to control myself. I talk to a doctor and he suggests me to follow some instructions. I am trying to follow them but sometime could not. I think 220 pounds is so much weight and I am afraid of some disease like high pressure, heart attack, diabetes etc. So I am thinking about health insurance. Now I am staying Germany and I am looking for insurance company or site which is providing information about health insurance in Germany.
 
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