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@Small town wrote:

This is for the same personal trainer. Would specific food purchased to weight train as a personal trainer be a business expense to the trainer? Any thoughts or opinions?

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The truth is that anyone could give you a yes or a no for an answer - it won't validate or disprove anything and you certainly shouldn't rely on it to prepare your client's return.  And why should you trust someone you don't know on the internet?

If you want a response you could use (with further research), you should consider providing your technical basis with the question.