fattening

adj

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

   “I'd really love to lose weight, the trouble is, tasty desserts with stuff like whipped cream are so fattening.”

noun

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

verb

1. (form-of, gerund, participle, present)present participle and gerund of fatten

   “‘Yer great puddin’ of a son don’ need fattenin’ any more, Dursley, don’ worry.’”