When it comes to weight loss, every cat’s experience is unique. Factors such as age, overall health, activity level, and diet all play a role in how quickly a cat can lose weight. Generally speaking, most cats can safely lose about 1-2% of their body weight per week. This means that for a cat that weighs 10lbs, they can safely lose 0.1-0.2lbs per week. It's important to remember that a cat's metabolism can slow down as they age, and this can affect the rate of weight loss. If a cat is over the age of 10, it may be best to aim for a slightly slower rate of weight loss (about 0.5% of their body weight per week). Additionally, any cat with underlying health issues should be monitored closely by a veterinarian, as their diet and activity should be tailored to their individual needs.