Food MythBusters covers a wide range of topics, including things like hunger and food security and marketing and advertising. They have resources in a variety of formats, including videos, infographics and fact sheets. The blog is also full of great information.
This is definitely a site I’d look through if I were putting together a lesson on food. Also, be sure to check out these great critical readings on food, as well as my TESOL presentation on teaching about food.