Can fatty liver syndrome on a budgie be reversed?

I have a Budgie who i brought not long ago as an adult. And he is showing signs of fatty liver syndrome.. maybe he was fed an all seed diet before i got him. I changed his food to low fat healthy crumbles stuff but no improvement. How long will it take? I think he is pretty sick... He sleeps all day fluffed up. He... show more I have a Budgie who i brought not long ago as an adult. And he is showing signs of fatty liver syndrome.. maybe he was fed an all seed diet before i got him. I changed his food to low fat healthy crumbles stuff but no improvement. How long will it take? I think he is pretty sick... He sleeps all day fluffed up. He is still eating and drinking. I hope he will pull through with a healthier diet.
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