Sentence:  Diet Light (Pizarro 724; snacks S2-7; 9:30am-10pm)/ This perennially busy place serves not-very-<WSD>diet</WSD>, but yummy nonetheless, ice cream (S2 to S5) and whopping servings of mixed fruit (S3) – with ice cream. 
Meaning of the word marked with <WSD> tags:  Containing less fat, salt, sugar, or calories than normal, or claimed to have such.