Answer to Question 1
People, policy, and programs.
Answer to Question 2
The challenge of improving the nutritional status of different kinds of people with varying education and income levels and different health and nutrition needs
The challenge of forming partnerships with colleagues, business leaders, and the public to advocate for change
The challenge of studying the scientific literature for new angles on how to help people make good food choices for good health
The challenge of mastering technologies to help meet the needs of clients and communities
The challenge of doing more with fewer resources