What to do about cat obesity

Many of my friends' cats are chubby, so let's learn about whether being overweight is good for cats and what harm obesity can cause them.

Harms of obesity in cats:

Studies have shown that fat cats are twice as likely to die between the ages of 6 and 12 as thin cats. They are also more prone to diabetes, fatty liver, heart disease, arthritis, urinary stones, breathing difficulties, and tumors (except for large breeds such as British Shorthairs, Maine Coons, and Norwegian Forest Cats).
Obese cats have a higher risk of anesthesia complications during neutering and giving birth, and they may also have difficulty becoming pregnant or experiencing complications during labor.
I know that chubby cats feel wonderful to cuddle with, but imagine having a 10-kilogram cat sleeping on your chest instead of a 4.5-5-kilogram one.

How to determine if a cat is overweight:

The cat should have a waistline, and you should be able to feel its ribs. Also, there should be no sagging belly.
In terms of weight, it is recommended by clinical experience to keep the cat around 4.5-5 kilograms (except for large breeds such as British Shorthairs, Maine Coons, and Norwegian Forest Cats).

What to do if your cat is already overweight:

The simplest solution is to feed them weight-loss food or change their feeding method to half the current portion.