1.what's trying to do? how does the visual elements contribute to that?
 This compaign is to promote the idea of stopping childhood obesity. The photo used some fat girls and boys pictures. each picture is accompanied by a sentence to make the ads' idea more clear to audiences.

2.if it involves both words and pictures, how do they work together?

In one ad, a girl appears, arms crossed, above the message: “WARNING. It’s hard to be a little girl if you’re not.” In another, a boy pitifully asks his mother, herself obese, “Mom, why am I fat?” She ducks her head in response but has no answer; accompanying text says that 75% of parents of overweight kids “ignore the problem.” It’s the kind of edgy campaign that would make anyone, skinny or fat, squirm.

3.what specific design choices are appealing or unappealing?

the fat girls and boys maybe easily cause people feel uncomfortable especially those fat children or fat children's parents.