Free-feeding vs. portioned feeding — which is better for cats?

Quick answer

Free-feeding causes less stress for cats, but a food-motivated cat can easily become overweight, and food left out can oxidize or get contaminated. Portioned feeding makes it easier to control intake, preventing obesity, and makes it easier to notice health changes (via appetite shifts). For obesity prevention and hygiene, portioned feeding split into 3–4 meals a day is recommended, and an automatic feeder is a great option for owners who work full-time.