“Understands the importance of a proper diet” is a mental requirement for our Tae Kwon Do students.
Each TKD belt level has 4 mentals, and students must memorize and recite them at tests. We also usually ask each student to talk about what they mean, and occasionally ask for a short essay if a student has not been displaying the values contained in the mental requirement.
But back to the importance of a proper diet. If you train like an athlete, you should eat like one.