If your cat is ageing, you will pay specially attention the weight of your cat and feed your cat accordingly. As a matter of fact, it is wise for you to weigh your cat every one to two months throughout its life. If this is unusual weight loss or weight gain, you will want to check with your vet.
You should know that it is very common for older cats to develop medical conditions like kidney and thyroid disease. More often than not, these condition are caused by lose weight, so consult your vet as soon as possible if your cat is losing weight. Also, you should know that overweight cats are unlikely to live because they are more likely to have serious illnesses like kidney disease, diabetes as well as arthritis. So it is very important to keep the weight of your cat under control.
A great way to go is to follow one of the many senior diets; usually they are lower in calories and reduce the likelihood of weight gain. If your cats with kidney problems, you will want to opt for protein restriction food. In addition to this, anti-oxidants and supplementation with polyunsaturated oils also may be beneficial, but there is no actual evidence can prove this , so it is best for you to ask the advice of your vet before you feed any food.
If your cat is losing weight, you will also want to consult your vet. Maybe there is an underlying medical problem come with your cat, if it is, you can also discuss whether a senior diet is advisable. More often than not, the vet will suggest special foods. If cat have a poor appetite, you will want to feed little and often, you can opt for warm the food or add a small quantity of pilchards or sardines.