Your Skin Is WARNING You (Don’t Ignore This!)

Berg frames the carnivore diet as the ultimate intervention for a damaged gut that cannot tolerate plant foods. He points out that many patients with SIBO experience worsening bloating with fiber because the bacteria in the small intestine ferment it. Standard gut-healing protocols often advocate fiber-rich diets, but Berg counters that for this specific population, elimination is necessary. The diet is described as a therapeutic tool, not a permanent lifestyle. By removing all possible irritants and supplying healing nutrients like glutamine, the gut is given a chance to recover. He observes clinical anecdotes of autoimmune and skin conditions resolving on carnivore, corroborating the gut-skin connection. This protocol is to be paired with gradual reintroduction and monitoring of tolerance.

Berg suggests that SIBO isn't just about overgrowth but often about poor gastric acid production. He ties this to the broader gut-skin theme: if SIBO is not addressed, nutritional deficiencies and systemic inflammation persist. The combination of fasting and acidification targets two root factors—impaired motility and low acid. He notes that this approach can greatly help, especially when paired with a carnivore or low-fermentation diet.

Berg emphasizes that many people don't produce enough bile even if they still have a gallbladder, due to diet, stress, estrogen, or high insulin. He recommends bile supplementation as a direct way to ensure fat-soluble vitamin absorption, then points to vitamin A-rich foods like beef liver and cod liver oil as the next step. This forms a two-pronged protocol: supplement bile to enable absorption, and consume preformed vitamin A. He mentions TUDCA by name as an alternative that 'works really good,' indicating personal familiarity with its use.

Berg explains that insufficient bile means you can't digest fat-soluble vitamins from food, so even a diet adequate in vitamin A may not be sufficient if bile is absent. He therefore recommends taking bile and then consuming rich sources of vitamin A. He mentions that cod liver oil has the dual benefit of providing active vitamin A and omega-3, which directly addresses the scaly skin condition and the underlying fatty acid imbalance from excess seed oils. Beef liver is another potent source. The protocol is dietary, not supplement-based, aligning with his food-first approach.

Berg describes a stepwise progression: inflammation leads to villous atrophy, which impairs nutrient absorption. Vitamin D deficiency then leaves the immune system vulnerable, triggering or worsening autoimmune skin disorders. His solution is unexpected—simply taking more vitamin D to 'penetrate into the areas that need to absorb it.' This counterintuitive approach acknowledges the gut damage but seeks to overwhelm the absorption defect. Sun exposure or phototherapy provides a gut-independent source of vitamin D, making it a crucial adjunct.

Berg positions probiotics as foundational, noting that even raw salads from a garden can be probiotic. He specifically recommends a good probiotic supplement and dietary fermented foods. However, he contrasts this with SIBO patients, where fermented foods might increase bloating—hence the earlier carnivore recommendation. This protocol is for general dysbiosis, not necessarily severe SIBO, and serves as the baseline gut-healing intervention before more restrictive diets.

Berg highlights L. reuteri as a particularly effective probiotic for the small intestine, unlike many probiotics that primarily affect the colon. He claims it can resolve acne entirely by healing the gut and eliminating systemic inflammation. The emphasis on making it yourself suggests that homemade ferments may have higher potency and viability. This protocol is presented as a highly effective, low-cost intervention that addresses the root cause of acne rather than masking it.

Berg builds a sequential cascade: altered microbiome (from poor diet or antibiotics) → systemic inflammation → rosacea. Small intestinal bacterial overgrowth (SIBO) displaces microbes into the small intestine, leading to nutrient competition and inflammation, also triggering rosacea. Gut inflammation, especially from gluten, impairs zinc absorption → the characteristic flaky, red skin around the nose and mouth. When inflammation becomes chronic, villi are lost, reducing vitamin D absorption → autoimmune skin diseases. Finally, insufficient bile (from gallbladder removal, sluggish flow, or high insulin depleting bile) prevents digestion of fat-soluble vitamin A → the goose pimple rash on the back of arms and legs. He stresses that the more damaged the gut, the stricter the dietary intervention must be, with carnivore representing the ultimate elimination diet for the most severe cases.

Berg explains that when someone has SIBO and gets worse with fiber, continuing to eat plant foods perpetuates irritation. He recommends going carnivore for a period, emphasizing that meat is rich in glutamine, an amino acid that serves as fuel for enterocytes and promotes healing of the intestinal lining. He cites anecdotal evidence of people clearing autoimmune diseases and skin issues on carnivore. The recommendation is presented as the ultimate dietary strategy for a severely damaged gut, with the caveat that the diet must be strict and temporary, followed by gradual reintroduction of foods once healing occurs.

Berg lists four causes of bile deficiency: diet, stress, estrogen therapy (birth control pills or HRT), and excess insulin from high carbohydrate consumption. He explains that without sufficient bile, fat-soluble vitamins (especially vitamin A) cannot be properly digested and absorbed. This leads to the hallmark goose-pimple rash (keratosis pilaris) on the back of arms and legs, and sometimes generalized itching. By highlighting insulin as a bile depletor, Berg expands the root cause beyond anatomical issues, making dietary carbohydrate reduction a key intervention for restoring bile and vitamin A status.

Berg explains that L. reuteri can colonize both the small and large intestine, producing an acidic environment where pathogenic bacteria cannot thrive. This reduces overall gut inflammation, which in turn diminishes systemic inflammation that manifests as acne. He specifically notes that many people with acne see complete resolution after adopting this probiotic. The recommendation to make it at home (via fermented dairy/yogurt) suggests a potent, live culture superior to some commercial products. He ties this to healing the gut to the point where systemic inflammation no longer rises to the skin.