Yes the ALT dropping is a very good thing. It means the damage to the liver is slowing down which means he is coming out of the vicious cycle of hepatic lipidosis. The liver has to use the fat deposits that have been stored on it. http://healthypets.mercola.com/sites/healthypets/archive/2011/12/13/feline-hepatic-lipidosis.aspx I don't know how much has been explained to you about hepatic lipidosis, this link has a good explanation. The feeding stops kitty from trying to use it's own body fat which means fat is no longer sent to the liver and the liver has a chance to catch up and metabolize the fat that has already been sent to it.