fattening

Short definition from Wiktionary

Adjective

1. 1
   That causes weight gain; often of high calorie food with relatively little nutritive value.

Noun

1. 1
   The act of making something fatter, particularly in reference or allusion to livestock.
2. 2
   The act of becoming fatter.

Verb

1. 1
   present participle and gerund of fatten