Hill’s Science Plan Adult 1-6 with Tuna is a complete dry food for adult cats living indoors or outdoors, designed to support healthy muscle maintenance, skin and coat condition, digestion, and overall vitality.

The first ingredient, chicken and turkey meal, supplies concentrated animal protein rich in essential amino acids for lean muscle and tissue repair.

With 31.7% crude protein and 19.3% fat delivering 4058 kcal/kg, the formula is energy-dense to support active cats or those needing higher caloric intake.

Salmon meal (5%) and fish oil provide omega-3 fatty acids (0.42%), while omega-6 fatty acids reach 3.05%, helping maintain a healthy skin barrier and a shiny coat.

A mineral profile of calcium 0.77%, phosphorus 0.71%, and magnesium 0.069% helps manage mineral load and supports urinary tract health in adult cats.

Dried beet pulp and oat bran contribute functional fibers that aid stool quality and promote regular digestion despite the low crude fiber content (0.9%).

Fructo-oligosaccharides act as prebiotics, feeding beneficial gut bacteria and supporting digestive resilience.

Taurine at 0.22% supports normal heart function and vision, essential for feline cardiovascular and ocular health.

High vitamin E (710 IU/kg) and vitamin C (103 ppm), together with beta-carotene and natural mixed tocopherols, provide antioxidant support against oxidative stress.

The carbohydrate content (NFE) is 37.4%, supplying readily available energy alongside the animal protein base.

Pros:

• Animal-protein first: Chicken and turkey meal as the primary ingredient deliver concentrated, highly usable amino acids for lean muscle maintenance.

• Energy support for active adults: 19.3% fat and 4058 kcal/kg provide a robust energy supply for cats with higher activity levels or increased caloric needs.

• Skin and coat nourishment: Fish oil and salmon meal contribute omega-3s (0.42%) alongside omega-6s (3.05%) to support a healthy skin barrier and coat sheen.

• Urinary mineral management: Controlled phosphorus (0.71%) and low magnesium (0.069%) help moderate mineral load to support urinary tract health.

• Digestive support: Dried beet pulp, oat bran, and fructo-oligosaccharides supply functional fiber and prebiotics to promote regularity and a balanced gut microbiome.

• Antioxidant protection: Vitamin E (710 IU/kg), vitamin C (103 ppm), beta-carotene, and mixed tocopherols help protect cells from oxidative stress.

Cons:

• High caloric density: At 4058 kcal/kg with 19.3% fat, the diet may contribute to weight gain in sedentary or strictly indoor cats without careful portion control.

• Significant carbohydrate level: Carbohydrate (NFE) at 37.4% indicates a notable carb contribution that may not suit cats requiring lower-carbohydrate approaches.

• Low crude fiber: The 0.9% fiber content may provide less satiety and stool bulk, offering limited support for hairball passage compared with higher-fiber formulas.

• Plant-derived inputs: Maize, broken rice, and maize protein meal add carbohydrates and some plant protein, reducing the proportion of protein strictly from animal sources.

• Multiple animal proteins: Poultry and fish sources may complicate feeding for cats that need single-protein, limited-ingredient diets for sensitivities.

• Modest omega-3 intensity: Omega-3 content (0.42%) is much lower than omega-6 (3.05%), which may limit anti-inflammatory support compared with more omega-3-rich diets.