Feline obesity is the most common nutritional disorder in cats. An estimated 60% of indoor cats are overweight, contributing to diabetes, arthritis, and shorter lifespans. Weight loss is achievable — but must be done slowly and carefully.

The Hepatic Lipidosis Risk

Critical: cats that stop eating or eat dramatically less can develop hepatic lipidosis (fatty liver disease) within days, sometimes fatally. Never:

  • Cut a cat's food by more than 20% suddenly
  • Let an overweight cat skip more than 24-48 hours of meals
  • Use crash diet approaches

If your cat stops eating during a diet, contact your vet immediately.

Setting Targets

  • 1-2% body weight loss per week (slower than dogs)
  • A 15-lb cat that should be 11 lbs: expect 6+ months
  • Patient and sustainable wins

What to Look For

High protein (35-45% DM) — cats preserve muscle better on high protein

Low carbohydrate — cats don't metabolize carbs efficiently. Under 20% ideal

Higher moisture (wet preferred) — lower calorie density per ounce

Adequate fat (12-18% DM) — don't go too low

L-carnitine — helps fat metabolism

Prescription Diets

  • Hill's Prescription Diet Metabolic — clinically proven
  • Royal Canin Satiety
  • Purina Pro Plan Veterinary OM

The Wet Food Advantage

For most cats, switching to primarily wet food does much of the work. Lower calorie density (~30 cal/oz vs 100+ cal/oz for kibble), higher protein, lower carbs, better satiety.

Practical Steps

  1. Baseline weight and body condition from vet
  2. Eliminate free feeding — scheduled meals only
  3. Transition to weight loss food over 7-10 days
  4. Feed for target weight, not current weight
  5. Measure precisely (kitchen scale ideal)
  6. Add interactive play sessions daily
  7. Reweigh every 2 weeks
  8. Eliminate treats during initial weight loss

FAQ

My cat seems hungry all the time on the diet — what to do?

Split daily food into 3-4 smaller meals. Use puzzle feeders. Higher-fiber weight loss foods provide more volume.

Can multiple cats eat weight loss food together?

Won't harm normal-weight cats but probably won't satisfy them. Feed individually if possible.

The Bottom Line

Feline weight loss requires patience, scheduled feeding, quality protein, and ideally wet food. The hepatic lipidosis risk means slow and steady — never crash diet a cat. See our cat food rankings.