This paper describes the rise and fall of multi-sectoral nutrition planning in the 1970s. The idea was that nutritional improvement to match resources to need should be integrated into broader development planning, not done separately once development planning was underway. If it were integrated into the broader system, solutions could cut across agriculture, health, and education sectors, making alleviating malnutrition much faster and more cost effective. While multi-sectoralism is not the same as a systems approach, a systems approach requires one to consider multiple sectors. This paper is quite useful to refer to when considering the current wave of multi-sectoral nutrition efforts.
Field, John Osgood. "Multi-sectoral Nutrition Planning: A Post-mortem." Food Policy 12, no. 1 (1987): 15-28.