I think it's quite hilarious to substitute like that and I suspect anything with heavy tomato based sauce in it or seasonings would be easy to slip under the radar. Your dad's diet sounds expensive!! Well those snack cakes and sodas would really add up here, even if you bought them in bulk. It's frustrating because if you wanted to spend that much every day on lunch you could eat excellent food I assume. Would he eat home baked cakes? They could have secret fiber added, sugar and fats cut etc.. and probably be cheaper.