I tend to agree with carnie on this, DairyQueen. Having a big tin of malted milk mix around can't be a good thing. Look at it like this - What if the tin contains several thousand calories worth of mix. Drinking it all will mean you may gain a pound or two of fat. This is why I only buy a small cone of ice cream somewhere instead of buying a half gallon carton at the supermarket, so I won't be tempted to eat more than I should. "Buy a tub, eat a tub"
Maybe you can get rid of the ice cream shop size tin of malted milk powder. If you crave a malted, to go the ice cream shop and order just one small serving, and enjoy it as a special treat.
Good luck