Here's a simple idea you may have heard for improving food security: Eat less meat. The logic goes like this. People in the developed world eat a huge amount of animal protein. And consumption of meat, eggs, and milk is already growing globally as people in poorer nations get richer and shift their diets.
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/could-less-meat-mean-more-food
[2] http://admin.indiaenvironmentportal.org.in/category/author/erik-stokstad
[3] http://admin.indiaenvironmentportal.org.in/category/journal/science
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/food-security
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/animal-products
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/food-supply
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/livestock
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/consumption-patterns
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/animal-feed
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/malnutrition
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/agriculture