I have tried the "better" all-natural, holistic brands. My cat did worse! She switched over with no problem. It was 4-6 months later she began vomiting - something in the year I had owned her, she had never done. First a couple times a month. By 6-9montgs on Halo, it was weekly. I also noticed a new fearfulness. She went outside less and less. She seemed more nervous in general. By 10 months+ her vomiting increased to daily and she had full blown paranoia. She behaved as though a giant anaconda was outside and inside! Not like her at all!!!! Finally I thought of switching back to inferior food of Science Diet - not gradual - but immediate!! NO vomiting!!! A cold turkey switch and she stopped vomiting immediate! The paranoia and anxiety decreased 50% within the 1st month. It took a whole year for her anxiety to go away. I may disagree with the ingredients, but they work best for my cat!!! I'll never try a fancy all natural ever again!!!