Every hard session leaves a bit of wear behind: damaged proteins, tired mitochondria, cellular parts that don't work as well as they used to. Your body has a system for dealing with that, and it's one of the most exciting areas of longevity science. It's called autophagy, literally "self-eating".
The 2016 Nobel Prize in Medicine went to Yoshinori Ohsumi for discovering how it works. The short version: your cells wrap up damaged components, break them down, and reuse the raw materials to build new, working parts. It's cleanup and recycling in one.
1. Why Autophagy Matters for Aging
- It declines with age: Autophagy slows down as we get older, and the cellular "garbage" that builds up is linked to stiffness, slower recovery and inflammation.
- It's tied to long life: In animal studies, boosting autophagy extends lifespan, and blocking it shortens it. Many of the best-known longevity interventions, from fasting to exercise, work partly through autophagy.
- It loves exercise: Physical training itself switches on autophagy in muscle. Kiting already gives you a head start.
2. The Switch: Growth Mode vs. Repair Mode
When you eat, insulin rises and a pathway called mTOR tells your cells to grow and build. That's good after training. When you stop eating for a while, insulin falls, an energy sensor called AMPK takes over, and your cells shift toward cleanup and repair. Healthy longevity is about cycling between both modes instead of living in permanent "fed" mode, snacking from breakfast to midnight.
A Note on Painkillers
Ibuprofen and other NSAIDs are useful for real injuries, but some research suggests that taking them routinely around training may blunt the adaptation and healing of muscle, tendon and bone. If you reach for them after every session, it's worth looking at recovery, mobility and sleep first.
3. Fasting Windows That Work for Kiters
You don't need to starve, and you definitely shouldn't ride a 3-hour big-air session on an empty tank. Use fasting where it fits your wind schedule:
Daily: The 14:10 or 16:8 Window
Finish dinner early and push breakfast back. For most people a 14 to 16 hour overnight fast is easy once you're used to it, and it gives your body a long daily stretch in repair mode.
Kite tip: On big wind days, move the window so you eat 1 to 3 hours before riding. Fasting is for flat days and mornings, not for 30-knot sessions.
Weekly: One Longer Fast on a No-Wind Day
If you're healthy and used to daily fasting, a longer fast on a rest day pushes deeper into repair mode. Keep sodium, potassium and magnesium up to avoid headaches and cramps.
Who should skip it: Anyone pregnant, underweight, with diabetes or a history of eating disorders. Talk to your doctor first.
Spermidine: Autophagy From Your Food
Spermidine is a natural compound that triggers autophagy. In mice it extended lifespan and protected the heart (Eisenberg et al., Nature Medicine, 2016), and in the long-running Bruneck study in Italy, people with the highest spermidine intake from food had lower mortality over 20 years. It's one of the 15 ingredients in the DoNotAge daily sachet.
4. The Refeed: Rebuild Stronger
Autophagy is the cleanup; the meal that ends the fast is the rebuild. Break it with real food rich in protein and the building blocks of connective tissue: eggs, fish, meat or legumes, a big pile of vegetables, and something with collagen like bone broth. In a study by Keith Baar's team, gelatin plus vitamin C taken an hour before short exercise doubled markers of collagen synthesis. Have the broth and the berries, then go move.
5. Supporting the Cleanup Every Day
Fasting is the strongest natural trigger, but it's not every day for most of us. That's where the daily sachet comes in: alongside spermidine, it includes resveratrol and quercetin (plant compounds studied for supporting healthy cell signaling and clearing old, "senescent" cells), plus NMN to support NAD+, the molecule your repair enzymes run on. It's an easy way to keep the repair side of the system supported, on fasting days and feast days alike.
Fuel Your Cellular Cleanup (10% Off)
Spermidine, resveratrol, quercetin, NMN and 11 more longevity ingredients in one daily DoNotAge sachet. It's fasting-friendly too: we take ours with water in the morning. Use discount code KITEHOMIEZ at checkout for 10% off your entire order.
Shop DoNotAge →Free: The Kiter's 10-Minute Flexibility Routine
The mobility and core routine we use before and after sessions, as a free PDF. Plus new videos and posts every few weeks.
This article is for general education and isn't medical advice. Talk to your doctor before starting a supplement or a fasting routine, especially if you are pregnant, have a medical condition or take medication. Some links on this page are affiliate links: if you buy through them, we earn a small commission at no extra cost to you.