@Meena Kadri I scrolled through some of the comments on OpenIDEO and stumbled onto your question. I'm aware of the fact that you've probably moved on by now (your post was a while ago...), but I still wanted to share the following :). In 2011 I conducted a case study on a competitor of Plumpy' Nut; Valid Nutrition. This Ireland-based company has been started by an Ashoka Fellow with a medical background. One thing I considered innovative about their model was the way they targeted low-income communities. Contrary to many of the other Ready-To-Use-Foods (RUFs) manufacturers, Valid Nutrition adopts a delivery model (Community-based Management of Acute Malnutrition - CMAM) that is based on changing attitudes and behaviours of mothers at community level. This results in a demand-led instead of a supply-led approach.
Besides their market approach, Valid Nutrition is also developing new products that are exclusively made from locally available crops. By sourcing ingredients and producing in local communities, it supports the respective economies and fosters entrepreneurship. The combination between community-based production and marketing leads to a positive economic cycle that assists in alleviating poverty and malnutrition at multiple levels.
For more information on the research: http://www.bopinc.org/sites/www.bopinc.org/files/documenten/access_to_food_and_improved_nutrition_bop_inc.pdf
For more information on Valid Nutrition: http://www.validnutrition.org/