How Much Canned Food Should You Feed Per Day?
The appropriate amount of wet food (canned food, meal packets) depends on your cat'sbody weight, age, activity level, and the caloric density of the food itself. According to AAFCO (Association of American Feed Control Officials) and NRC (National Research Council, 2006), an adult cat's daily caloric requirement is approximately RER × activity factor, where RER (Resting Energy Requirement) = 70 × body weight(kg)^0.75.
For example, a 4 kg adult indoor cat has an RER of approximately 198 kcal. Multiplied by an activity factor of 1.2, the daily caloric need is roughly 237 kcal. If the canned food provides 85 kcal per 100 grams, the cat would need about 280 grams daily, equivalent to roughly 1.6 standard 170-gram cans.
How to Calculate Caloric Needs
Step 1: Calculate Resting Energy Requirement (RER)
Formula: RER = 70 × body weight(kg)^0.75
| Body Weight (kg) | RER (kcal/day) | Indoor Adult Cat Daily Need (×1.2) |
|---|---|---|
| 3 kg | 160 | 192 kcal |
| 4 kg | 198 | 237 kcal |
| 5 kg | 234 | 281 kcal |
| 6 kg | 268 | 322 kcal |
Step 2: Check Caloric Information on the Label
Most complete canned foods list calorie content per 100 grams or per can (kcal ME). According to FEDIAF (European Pet Food Industry Federation) guidelines, wet food caloric density typically ranges from 70 to 120 kcal per 100 grams, depending on the protein-to-fat ratio.
Step 3: Calculate Daily Feeding Amount
Daily feeding amount (g) = daily caloric need ÷ kcal per 100g × 100
Recommended Feeding Frequency
According to a study published in the Journal of Feline Medicine and Surgery (Sadek et al., 2018), cats naturally tend to eat small, frequent meals, consuming food 10 to 20 times per day in the wild. For home environments, the following feeding frequencies are recommended:
- Kittens (0–6 months): 3 to 4 meals per day, due to high metabolic rates and small stomach capacity.
- Juvenile cats (6–12 months): 2 to 3 meals per day, gradually transitioning to adult frequency.
- Adult cats (1 year and older): A minimum of 2 meals per day; 3 to 4 meals is more ideal if feasible.
- Senior cats (10 years and older): 2 to 3 meals per day, adjusted based on appetite and health status.
The ISFM (International Society of Feline Medicine) emphasizes that scheduled feeding helps monitor appetite changes, which is a key early indicator of health issues.
All-Wet Diet vs. Mixed Feeding
According to the Cornell University College of Veterinary Medicine, both all-wet diets and mixed wet-dry feeding have distinct advantages:
| Factor | All-Wet Diet | Mixed Feeding |
|---|---|---|
| Hydration | 70–80% moisture; supports urinary tract health | Requires ensuring adequate additional water intake |
| Calorie Control | Lower caloric density; harder to overfeed | Dry food is calorie-dense; precise portioning needed |
| Convenience | Must be refrigerated after opening; not suited for prolonged exposure | Dry food keeps longer; suitable when away during the day |
| Dental Health | No significant teeth-cleaning effect | Dental benefit of dry food is also limited (except VOHC-certified products) |
| Cost | Higher cost per calorie | Combining with dry food can reduce overall cost |
Regardless of the approach, the AAFP (American Association of Feline Practitioners, 2021) recommends ensuring all foods used meet the AAFCO "Complete and Balanced" standard.
Storing Opened Canned Food
- Refrigerate after opening: Transfer uneaten portions to a sealed container or cover with plastic wrap. Refrigerate and consume within 48 to 72 hours.
- Warm before serving: Allow refrigerated food to reach near room temperature before serving. Cats prefer food at approximately 35–38°C (close to prey body temperature); cold food may reduce appetite.
- Do not leave out for more than 1–2 hours: Wet food promotes bacterial growth at room temperature, especially in warm weather. Discard any uneaten portions after this window.
- Inspect before feeding: If canned food develops an unusual odor, discoloration, or abnormal texture, do not feed it even if within the expiration date.
Research published in the Journal of Food Protection indicates that microbial growth in opened pet food is closely linked to storage temperature, and proper refrigeration significantly extends the safe consumption window.
References
- National Research Council (NRC). (2006). Nutrient Requirements of Dogs and Cats. The National Academies Press.
- AAFCO. Official Publication — Pet Food Regulations.
- Sadek, T. et al. (2018). Feline feeding programs: addressing behavioural needs to improve feline health and wellbeing. Journal of Feline Medicine and Surgery, 20(11), 1049-1055.
- ISFM. (2020). ISFM Guidelines on Feline Nutrition. International Society of Feline Medicine.
- Cornell University College of Veterinary Medicine. Feeding Your Cat. Cornell Feline Health Center.
- AAHA. (2021). Nutrition and Weight Management Guidelines for Dogs and Cats. aaha.org
- FEDIAF. (2021). Nutritional Guidelines for Complete and Complementary Pet Food for Cats and Dogs.