Understanding Weight Changes in Ageing Cats
First things first, we need to understand that weight changes in ageing cats is normal, and they often occur in two distinct stages.
As cats enter their senior years, they may become less active, which can lead to weight gain if we don’t adjust their diet, same as with dogs.
However, as cats become geriatric, they tend to lose weight – both fat and muscle. This loss can be due to several factors, from dental problems, that make eating painful, to a decrease in their sense of smell and taste, as well as changes in their metabolism. Studies have shown that after the age of 11, a cat's metabolic rate can actually increase, while their digestion and ability to absorb nutrients decrease. Many cats over 12 struggle to digest fat (up to a third) and protein, which can lead to weight loss even if they're eating the same amount.
This is why it's important to consider a cat's age when feeding them. Energy provision may need to be slightly decreased from 7 to 11 years old, but then increased from 12 years old onwards to account for these metabolic changes. In some cases, senior cats may actually need more food after the age of 12 to maintain a healthy weight.