How can I loose fat without my mum knowing?

Anonymous
This may sound strange but I'm wanting to lose fat without my mum knowing. I've started working out and I want to lose some fat to gain some definition but my mum says I don't need to lose fat and won't let me. How can I lose fat without her knowing?

(she cooks all the meals so I don't cook for myself)
Updates
+1 y
By hide I don't mean hide, I mean how can I lose fat without her taking an active role, cos she doesn't think I need to lose fat, but I want to gain definition
How can I loose fat without my mum knowing?
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