Podcast: Play in new window | Download
Summary
On episode 428 of 40+ Fitness, Coach Allan sits down with Dallas Hartwig, a functional medicine practitioner, certified sports nutritionist, and licensed physical therapist who specializes in lifestyle-related hormonal, digestive, and metabolic health, and who co-created the original Whole30 program.
Dallas lays out his Four Season Solution: our bodies run on the same expansion and contraction cycle at the scale of a day, a year, and a lifetime, and modern life has flattened those cycles into a chronic, always-on summer.
The conversation moves through sleep and the light-dark cycle, eating locally and seasonally, resistance training, and the deep, vulnerable connection most of us are missing.
Links
- https://dallashartwig.com
- https://www.instagram.com/dallashartwig
Key Takeaways
- Our biology runs on nested rhythms of expansion and contraction. Dallas identifies the same pattern across short ultradian cycles (like REM sleep), the daily circadian rhythm, the yearly seasonal cycle, and even the arc of a lifetime.
- Spring and summer are expansion, fall and winter are contraction, and both are necessary. Expansion is driven by dopamine, adrenaline, and cortisol (novelty, stimulation, hard work); contraction is driven by serotonin and melatonin (rest, gratitude, deep restoration).
- Modern life traps us in a “chronic summer.” Since the agricultural and industrial revolutions we’ve smoothed away the natural contraction phases, and stretching summer-type behaviors over years produces chronic disease.
- Sleep should track the local sunrise and sunset, not just hit a number of hours. The goal isn’t only more sleep, it’s more time spent in relative darkness, because that’s what regulates the body’s internal clocks.
- Bright morning light and avoiding blue light at night reset your circadian clocks. Blue light signals your brain that it’s midday and time to be alert, so screen exposure after sunset drags summer-style stress hormones into the evening.
- Eating locally and seasonally solves most nutrition confusion. Rather than picking a rigid tribal diet, Dallas argues our omnivore bodies naturally adapt across a spring Mediterranean-style diet, a plant-heavy summer diet, and a fall paleo-style diet.
- The nutrition “diet wars” exist because short-term studies produce conflicting conclusions. The common ground across all credible approaches is whole foods, adequate protein, and plenty of nutrient-dense plants.
- Resistance and functional strength training deserve equal weight with cardio. Building strong muscles, bone density, and joint mobility is highly correlated with maintaining independence later in life, yet most beginners overemphasize cardio.
- Dallas’s three strategies to get and stay well: eat what’s locally and seasonally available and confine eating to daylight hours; start resistance and functional fitness training now if you aren’t already doing it; and build deep, vulnerable, fall-type connection with the people close to you, something many men in particular were never modeled.
“We are stuck in a chronic summer.”
Dallas Hartwig
Another Episode You May Enjoy
Episode 476 – Why simple can be a bad long-term strategy for weight loss