When it comes to giving general cooking advice, I agree that this is not the right place. But take this one for instance.
He's asking advice on how to proceed with his food intake in direct relation to his physical exercise. I.e. this is clearly a physical fitness question.
If we only give advice on the exercise aspect of fitness, and disregard any question on nutrition and rest, we're propagating the idea that fitness is all about the workouts.
I say we should not only help out with the questions on the catabolic, but also the anabolic parts of fitness.
We have a close vote aspect where we vote to close because questions about nutrition are "off-topic" unless they relate directly to exercise. In the example I gave, it is so clearly related to exercise! It is explicitly stated that the advice he wants is for post-workout meals.
If we close this, we'll have to close any and all questions about nutrition. It's not about whether or not it relates to exercise anymore. It seems the only way this wouldn't get closed, is if he asked about what to eat during the workout.