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To my knowledge there are no foods that have been conclusively proved to lower uric acid.
I have seen some references to herbs used in traditional far eastern medicine that might reduce uric acid through natural compounds that act like allopurinol. I need to research this further, so if anyone has seen any recent research on this, please share it here.
I have a theory, backed up to some extent by research, that a diet rich in antioxidants can reduce uric acid, which is our own natural antioxidant. There is more about this on my Gout and Tomatoes page.
Please note that everything I have seen relates to fairly small reductions in uric acid, and is far from a proper clinical gout trial. Most gout sufferers have uric acid levels way in excess of the required 6mg/dL, and it is unlikely that food products could produce a big enough uric acid reduction.
If it really is the antioxidant content of tomatoes and other ingredients of the uric acid reducing soup, then it makes sense to switch some of your diet to high antioxidant foods.
Note that I say switch - not simply increase your food intake by adding a few berries. Weight control is probably more important than types of food for gout.
My gout care policy is to provide you with 100% satisfaction. If anything is wrong with my service, tell me and I will spend as much time as it takes to fix the problem.