Hold That Line! A "Diet"ribe

In my spoon I imagine no sugar.
In my mug I imagine no milk.
On my plate I imagine no pasta,
only green leafy veg and its ilk.
Each “…imagine no…” proving successful
leaves me more the giraffe, less the swine.
Grant this wish, Divine Vish: a volition suffish
to maintain my “…imagine no…” line!