The Big Keto Mistake... How Eat For Longevity.

The ketogenic diet might be one of the most misunderstood topics in modern nutrition.... Some people think it is the ultimate longevity diet. Others think it is dangerous pseudoscience. And the reality, when you actually look at the physiology and the long-term evidence, is far more nuanced than either side usually admits. In this video, I break down what keto actually is, what happens inside the body during ketosis, why reducing refined carbohydrates genuinely improves metabolic health, and whether full long-term keto is really the best strategy for longevity. We cover: -How the body switches between glucose and fat as fuel -What insulin resistance actually is -Glycogen, glucagon and the fuel priority order -What ketosis really means physiologically -Why keto rapidly reduces visceral fat and liver fat -The difference between cutting sugar and full nutritional ketosis -ApoB, LDL cholesterol and cardiovascular risk -The emerging concerns around long-term continuous keto -What keto appears to do to the gut microbiome -Why most people struggle to sustain keto long term -The Mediterranean diet and the strongest longevity evidence we have -What I personally recommend after reviewing the evidence One of the most important points in this video is that keto is pointing toward a genuinely important truth: modern chronic disease is deeply tied to metabolic dysfunction and chronically elevated insulin levels. But that does not automatically mean permanent ketosis is the best long-term solution for everyone. The evidence increasingly suggests there may be a middle ground — reducing free sugars and ultra-processed food, protecting overnight fasting windows, improving metabolic flexibility, and keeping fibre-rich whole foods in the diet. As much as some people like to think, this is not about dietary tribalism. It is about understanding human physiology properly and building an approach you can actually sustain for decades. TIMESTAMPS 00:00 Introduction SECTION 1: What keto actually is — the physiology 03:26 Your two fuel systems 06:48 Glycogen and glucose storage 11:30 Insulin resistance explained 16:33 Glucagon and the fuel priority order 20:56 What ketosis actually is 23:13 The power of metabolic flexibility 27:43 What full keto actually requires SECTION 2: What the evidence actually says 31:45 LDL cholesterol, ApoB and heart disease risk 41:12 Cellular ageing and senescent cells 46:28 Keto and the gut microbiome 50:46 Why most people cannot sustain keto SECTION 3: The three options 54:33 Option 1: Go full keto 57:18 Option 2: Cycle in and out of keto 1:03:08 Option 3: Cut free sugars and refined carbohydrates — keep the fibre SECTION 4: The long term evidence 1:06:23 The best dietary pattern SECTION 5: My honest opinion 1:12:17 What I recommend REFERENCES Intermittent fasting for adults with overweight or obesity https://pubmed.ncbi.nlm.nih.gov/41692034/ Medically supervised water-only fasting in the treatment of hypertension https://pubmed.ncbi.nlm.nih.gov/11416824/ Prolonged Water-Only Fasting Followed by a Whole-Plant-Food Diet Is a Potential Long-Term Management Strategy for Hypertension and Obesity https://pubmed.ncbi.nlm.nih.gov/39599745/ The Effects of Prolonged Water-Only Fasting and Refeeding on Markers of Cardiometabolic Risk https://pubmed.ncbi.nlm.nih.gov/35334843/ Efficacy and safety of prolonged water fasting: a narrative review of human trials https://pubmed.ncbi.nlm.nih.gov/37377031/ Is Fasting Superior to Continuous Caloric Restriction for Weight Loss and Metabolic Outcomes in Obese Adults? A Systematic Review and Meta-Analysis of Randomized Clinical Trials https://pubmed.ncbi.nlm.nih.gov/39458528/ Ultra-processed food exposure and adverse health outcomes: umbrella review of epidemiological meta-analyses https://pubmed.ncbi.nlm.nih.gov/38418082/ Ultra-processed foods and risk of all-cause mortality: an updated systematic review and dose-response meta-analysis of prospective cohort studies https://pubmed.ncbi.nlm.nih.gov/40033461/ Primary Prevention of Cardiovascular Disease with a Mediterranean Diet Supplemented with Extra-Virgin Olive Oil or Nuts https://pubmed.ncbi.nlm.nih.gov/29897866/ Adherence to Mediterranean diet and health status: meta-analysis https://pubmed.ncbi.nlm.nih.gov/18786971/ The effectiveness of the Mediterranean Diet for primary and secondary prevention of cardiovascular disease: An umbrella review https://pubmed.ncbi.nlm.nih.gov/39143663/ Mediterranean Diet and Mortality in People with Cardiovascular Disease: A Meta-Analysis of Prospective Cohort Studies https://pubmed.ncbi.nlm.nih.gov/34444786/ Disclaimer: This video is for educational purposes only and should not replace personalised medical advice from your own doctor or healthcare professional. #keto #ketogenicdiet #insulinresistance #metabolichealth #longevity #nutrition #visceralfat #bloodsugar #preventativemedicine #dralex #doctoralex