A year matters. So does the research behind it.
90 cats. Three diets. Roughly five years of follow-up. Here is the published research that inspired the nutrient trio in our daily treat.
The discovery that started it
What if their food could mean more time together?
In 2000, researchers began following 90 cats aged 7–17. They compared three complete diets. The difference was the nutrients added to their food.
longer average life for the full-trio group than the control group, in the researchers’ model.
An estimated difference in the study.Three groups. Three diets.
Reference diet
The control group received the base diet.
+ Antioxidants
The second group received added vitamin E and beta-carotene.
+ Full trio
The third received those antioxidants, plus whole chicory root and a blend of omega-6 and omega-3 fatty acids.
Cupp et al., 2007. Statistical estimate versus the control group; the study tested complete diets, not everlife.cat.
Read the published paperInside the five-year study.
The cats: 90 senior cats, aged 7 to 17 at the start, living in a research colony.
The diets: three groups of 30. The control group received the base complete diet. A second group received added vitamin E and beta-carotene. The third received those antioxidant nutrients, plus whole chicory root and a different balance of omega-6 and omega-3 fatty acids.
The follow-up: regular body-weight measurements, veterinary examinations and blood tests during the study. The published analysis reports roughly five years of follow-up; some cats were still alive.
How the researchers arrived at one year.
The researchers used a statistical model to estimate average age at death while accounting for the age of each cat at the start. That model estimated about one year more for the full-trio diet group than for the control group.
The paper also reports a Cox survival analysis. In that analysis, the antioxidant-only and full-trio groups did not differ significantly. The separate model of age at death did find a difference between those groups. The publication reports both results.
This was one study conducted by the company that developed the diets, with cats in a research colony. It did not include an independent test of Daily Sticks.
From the research to our daily treat.
Our formula brings together the three nutrient groups: antioxidant nutrients, prebiotic fiber and essential fatty acids. It also includes fish oil.
The study reported concentrations in a complete food. Our product page lists quantities in one 14 g stick. Adding a stick to your cat’s existing food does not recreate the study diet: the food already contributes nutrients, and the total depends on its composition and portion size.
The study’s lifespan estimate describes its diets and participants. It does not establish the same result or a timetable for visible changes from everlife.cat.
The original paper and patent history.
Cupp CJ, Jean-Philippe C, Kerr WW, Patil AR, Perez-Camargo G. Effect of nutritional interventions on longevity of senior cats. International Journal of Applied Research in Veterinary Medicine, 2007; 5(3): 133–149. Read the published paper (PDF).
European patent EP1637041B1 expired in September 2024 (official Dutch expiry notice). Patent history does not establish the effectiveness of Daily Sticks.
everlife.cat is not affiliated with or endorsed by Nestlé Purina or the study’s authors.
The next step fits in your hand.
See the trio, the individual amounts and the daily lickable treat.
Explore the Daily SticksLast updated October 14, 2026.