My t-score is low. What are the things I should do or shouldn't do?

Weight bearing. . Not sure why t score measured at such young age. Makes me wonder if you have some predisposition to low t score. If so, risk factors should be identified and treated specifically. If this was measured just because, treatment should be regular wt bearing exercise plus a good diet with calcium approx 600 mg twice a day and vit d approx 800 mg daily. Repeat bmd in a few yrs to eval efficacy.