A fat-camp failure continues to pack on the pounds in this sharp, sweet, serious show. Eventually Minerva (Diana Campos) is literally so puffed up she floats above her loving but ineffective husband (Tony Sancho) and concerned yet self-absorbed sister (Sandra Delgado). Minerva is relieved to be free, and they realize too late what she means to them. What makes Luis Alfaro's play, directed by Sandra Marquez for Teatro Vista, so enjoyable is its balance of whimsy and weighty emotional issues: this 90-minute show is very funny yet soberly examines Minerva's food lust and inner sadness, presenting deft observations on marriage, sisterhood, and dating. The talented cast delivers realistic, affecting performances, giving warmth to Alfaro's consideration of consumption, complacency, and commitment. Through 10/16: Thu-Fri 8 PM, Sat 5 and 8:30 PM, Sun 4 PM. Sat 9/24, 8:30 PM only. Chopin Theatre, 1543 W. Division, 312-494-5767. $22.