Fattening

[Kit]

The quality in food that will potentially make someone [fatter]. A high content of [fats], [calories], etc.

[Dave Paprocki]

(of a foodstuff) liable to make a person overweight.

[Luis Fok]

When something happens thats basically annoying, but [it goes] beyond this..especially [applies] to when something unintentional or [unusual] happens. Also Related to Thinining.

[Julian]

Fattening food contains a lot of fat, sugar, etc. that would quickly make you fatter if you ate a lot of it: