Weight gain for teen

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Could really use some help.. I’m 18 about 5’2 in height I weigh around 70-80 not exactly sure I need some tips or recommendations on what to do to gain weight for example what to eat what to take and so on do I need a routine or plan I should go by? I heard ensure is good option also but I haven’t tried it

My biggest goal is just to gain weight once I achieve my goal I would then exercise if I choose too I know that body types is important I’m just trying to see we’re my gained weight goes to first then I’ll tone

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