Five things with better evidence than any longevity drug
We write about rapamycin because the science is real and moving. But if you want more good years with your dog or cat right now, the best-evidenced interventions are unglamorous, mostly free, and sitting in plain sight.
Our Beloved Friends Research · July 16, 2026 · 9 min read
A site that sells nothing can afford to tell you something the supplement aisle never will: the interventions with the strongest evidence for a longer, healthier life for your animal are not for sale, and most of them are free.
We spend a lot of words here on rapamycin and the geroscience frontier, because it is genuinely the most interesting thing happening in companion-animal medicine. But "most interesting" is not "best evidenced," and confusing the two is how owners end up spending money on a powder while ignoring the thing that would actually help. So here is the unglamorous list, ranked by how good the evidence really is.
1. Keep them lean — this one has a lifespan trial
If you do nothing else, do this. In a landmark study, Labradors were raised in pairs — one fed freely, its littermate fed 25% less — and followed for life. The lean-fed dogs lived a median of about 1.8 years longer, and the onset of chronic disease was delayed (Kealy et al., JAVMA, 2002).
Read that again: a lifespan result, in dogs, from a controlled lifelong study. Nothing on our compound shelf — not rapamycin, not urolithin A — has evidence that clean in a companion animal. The single most powerful longevity intervention available to you is a measuring cup and the discipline to use it.
The same principle holds for cats, where obesity drives diabetes, arthritis, and a shorter life, even if the controlled lifespan trial has not been run.
2. Look after their teeth
Periodontal disease is one of the most common conditions in adult dogs and cats, and it is not just about breath. Chronic oral infection and inflammation is associated with damage elsewhere in the body, and dental disease tracks with markers of systemic ill health. Dental care — cleaning, and not ignoring a mouth that needs veterinary attention — is a genuine healthspan intervention wearing a very boring costume.
3. Keep them moving, and keep their muscle
Loss of muscle mass with age — sarcopenia — is not just frailty; muscle is metabolically protective, and losing it accelerates decline. In an old cat losing condition, or an arthritic dog that has quietly stopped doing the stairs, maintaining activity and muscle is one of the highest-value things you can do. It is also where a lot of "my pet is just getting old" actually hides a treatable problem, like pain.
4. Screen early — before anything looks wrong
This is the one owners skip, and it is the one that changes outcomes. The diseases that take older animals — kidney disease in cats, many cancers in dogs — do their early damage silently. A blood panel on a healthy-seeming seven-year-old cat, or an eight-year-old large-breed dog, catches things while they are still manageable. The SDMA test can flag feline kidney decline earlier than older tests. You cannot act on what you have not measured.
5. Then — and only then — the frontier
Once the four above are actually handled, it is entirely reasonable to be interested in the geroscience: rapamycin, the Dog Aging Project, the compounds in our library. We are, obviously — it is most of what we write about.
But notice the order. The frontier is genuinely exciting and genuinely unproven: no drug has been shown to extend the lifespan of a dog or a cat, and the trial built to find out is still running. Meanwhile the four boring things above have evidence ranging from strong to a literal controlled lifespan trial. Doing them is not settling for less. It is doing the thing that works while the science catches up.
Why we, of all sites, are telling you this
Because we can. We sell nothing, so we have no product to steer you toward and no reason to make the free interventions sound less important than they are. A supplement company cannot comfortably lead with "actually, the measuring cup beats our powder." We can, because it is true, and because being the site that tells you the true thing is the entire point.
Our evidence quiz will point you to what applies to your specific animal — and, whatever your result, it ends where this article does: with the fundamentals, and with your veterinarian.
Not veterinary advice. Talk to your veterinarian about your animal's weight, teeth, and screening.
References
- Kealy R.D. et al. Effects of diet restriction on life span and age-related changes in dogs. JAVMA, 2002. Find on PubMed
- Salt C. et al. Association between life span and body condition in neutered client-owned dogs. Journal of Veterinary Internal Medicine, 2019. Find on PubMed
- Freeman L.M. Cachexia and sarcopenia: emerging syndromes of importance in dogs and cats. Journal of Veterinary Internal Medicine, 2012. Find on PubMed
The content on this site is for informational purposes only and is not veterinary advice. These statements have not been evaluated by a food or drug regulatory authority and are not intended to diagnose, treat, cure, or prevent any disease. Always consult a licensed veterinarian about your pet's health.