The #1 Root Cause of All Chronic Disease is NOT What You Think...

Berg states that poor sleep is one of the most potent disruptors of health, capable of severely affecting blood sugar and mood. He notes that night shift work is classified as a probable carcinogen because of how deeply sleep affects whole-body genetics. Morning light exposure is the foundational circadian anchor. The sun's infrared rays penetrate clothing and tissue to stimulate melatonin production, which supports sleep and mitochondrial health. He emphasizes that even on overcast days, the outdoor light signal is far stronger than indoor lighting and is necessary to lock the circadian rhythm.

Berg contrasts the modern habit of staying in bright artificial light right until bedtime with the ancestral pattern of a gradual sunset. Even pre-sleep device use bombards the brain with blue and green light that suppresses melatonin. By dimming lights and creating a dark environment, the body recognizes that night is beginning, allowing melatonin to rise naturally. He ties this to the same circadian reset mechanism as morning light, making it the evening bookend to the morning protocol.

While stressing the importance of a consistent sleep-wake schedule 7 days a week, Berg notes that jet lag is a major circadian jolt. He observed that taking 50,000 IU of vitamin D3 right before a flight reduced his jet lag symptoms, and he shares it as a travel tip. He implies that vitamin D may play a role in circadian rhythm stabilization, though he does not explain the mechanism in detail. This protocol emerged from his own habit of taking substantial vitamin D due to his genetically weak activation pathway.

Berg explains that in ancestral times, food was not constantly available—there were likely days without eating and periods of feast after a hunt. The modern pattern of eating from morning to night keeps insulin elevated, which he calls “a killer for insulin problems.” By compressing the eating window, the body gets prolonged periods of low insulin during which it can access stored fat and improve insulin sensitivity. He contrasts this with the 24/7 food availability that is a major factor in the gene-environment mismatch.

Berg ties this practice back to the ancestral norm: milk was raw and often fermented into yogurt and cheese, supplying a continuous influx of probiotics. Today’s pasteurization kills bacteria, and processed diets starve the microbiome. He personally adds unsweetened chocolate to his morning coffee, noting that it feeds beneficial microbes. He does not specify exact brands; he simply advocates making fermented foods a consistent dietary staple to rebuild the microbial diversity that modern life strips away.

Building on his earlier argument about the Amish farm study, Berg shares that he lives on a farm and is “around a lot of microbes,” correlating that with the fact that he never gets sick and his immune system is “super, super strong.” He frames soil contact as a direct way to recapture the microbial training that our HLA genes evolved to expect. He also references the practice as a form of nature immersion, aligning with the nature-time recommendation he gives three times a week.

Berg advocates combining heat and cold exposure as part of the modern toolkit to mimic the environmental stressors our ancestors routinely encountered—for instance, heat from sun or fires and cold from weather. He describes it as “very, very therapeutic” and says it works by creating a mild stress that triggers epigenetic adaptations, making the body more robust against larger stressors. He couples sauna with cold exposure in the same point, suggesting they can be alternated.

Berg frames all chronic disease as a progression: a root cause initiates cellular breakdown that eventually manifests as a diagnosable disease. Medicine, he says, intervenes at the symptom stage, giving a name and a prescription, but each medication brings side effects that are then medicated again—polypharmacy. He contends that the more drugs a person takes, the less healthy they become, and that the system has no financial incentive to go upstream. His 10-year investigation kept moving earlier in the disease timeline until he realized the common denominator: our environment has changed dramatically in a few generations, but our genes have not adapted. In the ancestral past, food was intermittent and whole, sun exposure was abundant, physical work was constant, microbial diversity was extreme, and chemical toxins were minimal. Today, over 50% of adult calories are ultra-processed, food is available 24/7, artificial light dominates, movement is optional, the microbiome is starved, and forever chemicals infiltrate water. This collective mismatch, he argues, is the one root cause upstream of all chronic disease.

Berg walks through his genetic report to illustrate that the same genes that conferred survival advantages in ancestral times become liabilities today. He has an HLA-linked autoimmune risk for gluten; every vacation, he would eat wheat and end up in a hotel bed all night with stomach pain. He now avoids gluten entirely. His choline absorption is genetically poor, which would have been compensated by nose-to-tail eating rich in liver; he dislikes liver, so he gets choline from ample egg yolks. He has a marked inability to activate vitamin D, matching a history of severe low back pain that resolved with winter supplementation and summer sun. His genes make him highly inflammatory in response to polyunsaturated fatty acids (seed oils); in his 20s, junk food gave him arthritis in his fingers and back. That early inflammation was a “wake-up call” that in his view made him healthier at 60 than he was then. His detoxification enzymes are genetically weak, so he filters water, avoids toxins, and eats garlic and onions daily for natural detox support. His nitric oxide bioavailability is genetically low, predisposing him to hypertension, but now beet and arugula intake plus sun exposure keep it adequate. He notes that all these variants had survival value in a microbe-rich, food-scarce, sun-drenched past but become problems in a sterile, overfed, indoor modern world.

Berg describes the ancestral environment as a “training camp for your immune system,” rich in a diverse microbiome from soil, animals, and fermented foods like raw cheese and yogurt. Today, pasteurization kills beneficial bacteria, and sterilized living prevents children from building robust immunity. He cites a study comparing Amish children raised on farms—exposed to farm dust, dirt, and animals—with children in sterile environments; the farm kids had significantly stronger immune systems. At the genetic level, he points to the HLA gene complex, the most polymorphic region of the human genome, which evolved to handle countless friendly and unfriendly microbes. In the absence of those microbes, this hyper-diverse system can misdirect attacks on the body’s own tissues, leading to the autoimmune diseases that now affect millions. He also criticizes over-dependence on vaccines as another way of bypassing natural immune education. The solution he implies is reintroducing microbial diversity through fermented foods at every meal, getting hands in soil, and avoiding over-sterilization.