Solution
Option 1 -> Not mentioned in the passage as a factor affecting the food insecurity-diet quality relationship.
Option 2 -> The passage does not discuss any issues with overreliance on scientific studies versus real-world evidence.
Option 3 -> The passage explicitly states that the relationship between food insecurity and healthy diet is "complex, shaped by factors like food environments, consumer behaviour, and the affordability of nutritious foods."
Option 4 -> While the passage does clarify that food insecurity can lead to both undernutrition and obesity, this represents a misconception rather than a complicating factor.
Hence, Option 3: Variations in food environments, consumer behaviour, and affordability -> The passage directly identifies these three factors as what makes the relationship between food insecurity and diet quality complex, explaining that it's not simply intuitive that food-insecure people eat less healthy diets—the reality is shaped by multiple contextual variables -> correct