I go back and forth about things like this. It does draw attention to a real problem (food insecurity), but so many time s it feels like a publicity stunt. I'd like to see someone try it for more than a week or a month, and to start from zero--nothing from cupboards.
I do take issue with the 'all you can eat on a limited budget is '****e food' though. True, that is what a lot of people eat, but it's not all that's out there. There are a couple of reasons that crapfood becomes the fall back: no place to store fresh food safely and inability to cook from scratch. My family of 6 generally spends around $150/wk at the grocery store for EVERYTHING (food, TP, cleaning supplies, personal care), so $25/person. We eat very little 'filler' food (okay, I buy 2 bags of chips a week, for the guys' lunches). My fridge is full of fresh food and veg, we buy from the bulk bins for staples/nuts/spices/cereals, and watch meat carefully for sales & eat meatless at least one day a week (often twice). Everyone is full and satisfied, no one is too skinny--oh, to have that problem. What makes it work for us is that we make most every dish from scratch (week nights are generally 30 minute meals or crock pot, so cooking is not a huge burden. Weekends we often do more time or labor intensive dishes.), and we do have that all important fridge. Not everyone has that. Knowing how to cook is a godsend when your food budget is limited.
- it does have twice the calcium though, so we all ended up with good teeth) 
what is she trying to do? Shrink it? 
