Quote:
Originally Posted by Carolina 
Not really Auntie... Cats tend to maintain a healthy weight on canned food - with or without grains.
I do personally believe in quality, and refuse to feed junk, in any form of food, but a great way to keep your cat in shape is to keep it on wet food... That's well known....
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I think there's a misunderstanding here.... I strongly advocate for wet food over kibble; I feed it to my fosters. I wish kibble would go away like, tomorrow.
Grains do have a large negative impact on the quality of a food, but I'm actually not referring to grains at all here.
Let's try this. Say you have a 10 pound kitty and, according to whoever's standards you care to use, that 10 pound kitty (let's call him Jim) requires 1500 calories a day to maintain his weight.
Cats convert animal-based protein directly into energy, so if you gave him three meals that contained 1500 calories and consisted of strictly meat-based protein (say, chicken in the morning, rabbit for lunch and quail for dinner), all 1500 of those calories would be counted as useful for Jim.
If, however, you gave him three plant/vegetable/fruit-based meals that also contained 1500 calories, most of those calories would be wasted or converted into sugar and stored as fat. Jim's digestive system would be stressed and upset and Jim would be both tired and hungry. Too many of those meals and Jim would likely end up overweight and undernourished.
Now, there are few, if any, commercial products that match either of the above scenarios. They are all different combinations of animal-based and non-animal-based products. The only calories doing our kitties any good are the ones sourced from animals - but there's no telling what that caloric number actually is. In addition, that number changes from variety to variety and, even, from batch to batch within the same variety.
Since it's impossible to determine how many animal-based calories are in any given product, it's best to adjust portion sizes by the actual cat's reaction to the food. If Jim plumps up, reduce his portions; loses too much, increase his portions.
It's the counting and comparing of caloric content within and between products in order to determine portion sizes that I consider inefficient, not the feeding of wet foods. (Wet foods are so much healthier for cats than kibble, it's crazy that kibble is still being sold as a "food" item for kitties. *shakes head sadly* But that's a topic for another post, or 20. *smile*)