Light diet

A light, or reduced-calorie, diet is one formulated to contain fewer calories than the matching standard food, intended to support weight management in animals that are overweight or prone to gaining, notably after neutering or with low activity. The energy reduction is usually achieved by lowering [crude fat](/glossary/crude-fat), the most calorie-dense nutrient, and raising the fibre share to increase the satiating effect, while keeping quality protein high to preserve lean muscle mass during weight loss (FEDIAF, 2024). A point worth knowing for European and UK buyers is that, unlike vaguer marketing words, claims such as light or reduced fat correspond to set criteria under EU labelling rules, so they are not entirely unregulated (Regulation (EC) 767/2009). The most important caveat, however, is that a light food is not magic. Without an appropriately reduced [ration](/glossary/ration), excess weight simply persists, because an animal fed too much of a light food still consumes too many calories. Genuine, supervised weight loss requires calculating the ration, weighing the portions rather than scooping by eye, and limiting extras such as [treats](/glossary/treat). For an established case of obesity, an over-the-counter light product is often not enough, and a [therapeutic and veterinary diet](/glossary/therapeutic-and-veterinary-diet) for weight loss with veterinary follow-up is usually needed. The central reference is always the energy actually eaten rather than the word light printed on the bag, which is why [portion control](/glossary/portion-control) still matters most. For more, see the [Petipedia glossary](/glossary).

Petipedia · Editorial team

General documentary information. For an individual animal, a veterinarian's advice takes precedence over any online content.