Tunch has finally adjusted (and by adjusted, I mean that he has not attacked my feet in two weeks and is eating his food and has stopped skulking around the house bitching at me 20 hours a day) to the switch from Science Diet Lite to Felidae, and I have to say that I really like the results so far:
1.) He appears to have already lost a little weight, and the switch took place just a little bit ago.
2.) His bowel movements are smaller. Why is this important, those who do not own cats might ask? Because he shits in a box in my house.
3.) His fur seems healthier. I brush him every morning (and when it is really hot, I brush him at night, too), and his hair seems smoother and silkier and just, in general, healthier.
4.) He seems less sluggish and more active, and I have noticed his nose is moister and pinker, FWIW.
In general, he seems friskier, more active, happier, and healthier, and these are observations after just a few weeks.