Currently, food is automatically changed to nutrition.
Is this policy correct?
No, food is different from nutrition.
nutrition is specific
Nutritional science investigates the metabolic and physiological responses of the body to diet.
Example: Does asparagus contain enough vitamins for a whole day?
Whereas food is generic
Food is any substance consumed to provide nutritional support for the body.
Example: Do blue carrots exist?
As such they should be used as appropriate and not synonyms: nutrition for questions about the nutritional properties, and food for more general questions about food.
Note: sometimes food is better tagged natural-remedies or herbalism
Examples: Does orange prevent flu?; Does chicory enhance your eyesight?