Focus on the pre-security options (of which there are few). The chances of the TSA allowing you through just to eat are very slim.
From
Analise's link, the options seem to be a Subway in T7, the following in T4:
- Au Bon Pain
- Bar Avion
- Café Ritazza
- Cucina Sandwiches and Salads
- KFC Express
- McDonald's
- Sam Adam's Celebrates NY
- Sbarro's Wok & Roll
and the following in T1:
- Euro Cafe (w / Krispy Kreme Kiosk)
- Greenwich Village Bistro
- McDonald's
- Panini Express
- Soup & Kimbob
- Wok & Roll
Really very few options.
If you can jedi mind trick your way past security, I'd aim for the JetBlue terminal (T6); they have the best selection.