Should I say ‘a proper healthy diet’ or ‘proper healthy diets’ in the sentence?
Students must have (a proper healthy diet, proper healthy diets) in order to become fully competitive in or outside the school.
I would go with the singular (treating "students" as a group). You could also make it a generalized statement: " A student must have a proper healthy diet in order to become fully competitive in or outside the school. I would reserve "diets" for when you are talking about clearly separate diets.
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I would go with the singular (treating "students" as a group). You could also make it a generalized statement: "A student must have a proper healthy diet in order to become fully competitive in or outside the school.
I would reserve "diets" for when you are talking about clearly separate diets. For example:
Avoiding too much sugar or cutting down on your fats are both pro