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My cat has the same issues, after blocking the first time I fed him only high quality wet food but he still blocked. I now test his urine ph and feed him low phosphorus high quality wet food and Royal Canin Urinary SO. What is young again?Crystals and blockages happen for a variety of reasons. And each cat is different. Yes, cats have been known to block even on high end canned and even raw diets. My guy is one of those. In that case, some cats are very sensitive to mineral content, specifically phosphorus. Cat food high in fish is usually high in phosphorous. Some cats have urine PH issues. Some cats have dry food /water issues and some cats have stress issues or a combination. What causes FLUTD varies from cat to cat. So to say a food is the cause is not accurate because each cat reacts differently. We fed my cat every expensive canned no grain food available and a variety of raw and he still blocked. We've been trying Young Again because the prescription food is crape and making him fat. So far so good. Their mature formula has reduced mineral load and tons of meat but more importantly, he eats it. So it's hit or miss with FLUTD. Sometimes a script food is all that works.