How does Doctor keep records of weight loss?

I have never really gone to the Doctor in any regular fashion. I keep hearing that the Doctor wants past weight loss and gain. How do they get this information, espcially since in my case it was never really documented on a regular basis. And what can I do to get this information to him. I haven't really seen a doctor yet, I just moved back home. So, I am kind of in a quandry as to where to start and who to talk to?

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