Why Is My Cat Not Losing Weight?

If your cat isn't losing weight despite longer playtimes and fewer treats, it's easy to assume they're simply not active enough. The truth is sometimes more nuanced. While overfeeding remains the leading cause of obesity, certain medical conditions can make weight loss frustratingly difficult.

If your cat is maintaining a healthy diet but still gaining weight, book a weight assessment with our nursing team at Animal Medical Centre to find out what's really standing in their way.

Identifying barriers to weight loss in cats: when exercise isn't enough

The ‘lazy cat' myth

Many owners feel disheartened when exercise alone doesn't shift the scales. In most UK cases, weight gain is linked to a mismatch between calories in and energy out, but occasionally, underlying health conditions are responsible. Identifying which category your cat falls into is crucial and our vets in Childs Hill are here to help.

One of the most common medical blockers to weight loss is osteoarthritis. Pain may reduce movement, creating a cycle of inactivity and further weight gain.

Key metabolic blockers

• Osteoarthritis: Pain may reduce movement, creating a cycle of inactivity and further weight gain.
• Diabetes mellitus: Insulin imbalance affects how energy is processed from food.
• Metabolic Syndrome: Increasingly recognised in 2026, especially in indoor cats, where insulin resistance develops even in younger felines.

The silent signs

Call us on 020 8450 2228 to get advice from our vets in Childs Hill if you notice:

• Hesitation jumping up or down or utilising a middle height ‘stepping stone'
• Slowness going up or down stairs
• Abnormal gait
• Reduced grooming / increased matts
• Sleeping more

The bigger picture: the UK obesity epidemic

According to the 2024/2025 UK Pet Food Obesity Report and PDSA PAW data, around 43% of cats in the UK are overweight. Yet 77% of owners believe their pet is a healthy weight, highlighting a significant perception gap. Excess weight can shorten lifespan by up to two years and increases the risk of arthritis, diabetes and heart disease.

In reality, 90-95% of cases are due to overfeeding, not medical disease. Our nurses at Animal Medical Centre explain that common pitfalls include:

• The Treat Trap: Food used as affection -swap for praise or play.
• Inaccurate Portions: 18% of owners ‘eyeball' meal portions - use a digital scale.
• Human Scraps: 60% admit feeding leftovers that are too calorie-dense for pets.

Assessing shape, not just scale

Animal Medical Centre's nursing team use a Body Condition Score (BCS) rather than weight alone. At home, try to:

• Feel the ribs easily without pressing hard.
• Look for a visible waist from above.
• Check for an upward tummy tuck from the side.

Is it medical or meals? For most pets, the solution lies in portion control, but for some, targeted treatment from our vets in Childs Hill is needed.

Book a weight assessment with our nursing team at Animal Medical Centre to identify barriers, close the perception gap and create a safe, realistic plan for your cat's long-term health.