Could adderal cause weight loss?

Yes. Adderall (dextroamphetamine and racemic amphetamine) is in a class of medications that can cause weight loss.
Absolutely. Adderall (dextroamphetamine and racemic amphetamine) is a stimulant that induces the well-known fight or flight response. Part of that response is a reduction in hunger, and that is the primary mechanism of weight loss.