Valter Longo
University of Southern California
Valter Longo is the director of the Longevity Institute at the University of Southern California and the Oncology and Longevity Program at the Institute of Molecular Oncology Foundation in Milan, Italy. His research focuses on the biological mechanisms governing the aging process and the roles of diet, caloric restriction, and fasting in human healthspan. His publications explore the therapeutic and metabolic impacts of fasting-mimicking diets across various conditions, including cancer, type 2 diabetes, and cardiometabolic diseases.
27 claims checked on air: 2 context 1 contradicted 21 supported 3 unverified 1 flagged
What they said on air - unverified
12 citing their own research
Approximately 50% of growth hormone receptor deficient mice reach the end of life without obvious pathological lesions, compared to less than 10% in control mice.
"and yet about half of the mice get to the end of life without any obvious pathological lesion, so they don't develop diseases. In the controls, this is less than 10%." (said at 0:11:20)
No published record matching the specific claim that approximately 50% of growth hormone receptor-deficient (GHRKO) mice reach the end of life without obvious pathological lesions compared to less than 10% in control mice was located; this does not prove the claim false.
Over 25,000 people have completed the ProLon fasting-mimicking diet with very few severe side effects reported, and no evidence that the diet caused those severe side effects.
"there's over 25,000 people that have done the fasting-mimicking diet, the ProLon, the same diet that was tested clinically, with very, very few severe side effect reports, right? And even the ones that had severe side effects, you know, they fully recovered, and there was no evidence that it was the diet that that caused them" (said at 0:36:44)
No published record matching the post-market safety data or registry of over 25,000 individuals completing the ProLon fasting-mimicking diet was located; this does not prove the claim false. While published clinical trials have evaluated the fasting-mimicking diet in smaller human cohorts (typically dozens to hundreds of participants) and reported mostly mild-to-moderate adverse events such as fatigue, weakness, and headaches, the specific figure of over 25,000 users and their post-market adverse event reporting appears to derive from unpublished commercial customer data.
The biological process of autophagy originated evolutionarily in bacteria.
"I mean, of course starting with bacteria, but the process of autophagy started back then in bacteria." (said at 1:03:37)
No published record matching the claim that autophagy originated evolutionarily in bacteria was located; this does not prove the claim false.
Fact-checked episodes
Publications
- Senescent obesity signature in breast cancer: a paradigm of reverse cardio-oncology.European heart journal 2026 · CEBM Level 5
- Brief Report: A Pilot Study Evaluating the Feasibility, Safety, and Compliance With a Fasting-Mimicking Diet in Patients With Metastatic Non-Small Cell Lung Cancer.Clinical lung cancer 2026 · CEBM Level 4
- A Fasting-Mimicking Diet Affects the Inflammatory Response Following Periodontal Treatment: A Multi-centre Feasibility Randomised Controlled Pilot Trial.Journal of clinical periodontology 2026 · CEBM Level 2
- Methionine-supplemented longevity diet increases growth hormone, GLP-1, and FGF21; reduces frailty; and promotes healthspan.Cell metabolism 2026 · CEBM Level 5
- Fasting-mimicking diet counteracts gut microbial dysbiosis in experimental lynch syndrome.Cancer & metabolism 2026 · CEBM Level 5
- Feasibility and Preliminary Effects of a 5-Day Fasting-Mimicking Diet in Asian Americans With Prediabetes: A Pilot Study.Diabetes, obesity & metabolism 2026 · CEBM Level 4
- Fasting-mimicking diet potentiates anti-tumor effects of CDK4/6 inhibitors against breast cancer by suppressing NRAS- and IGF1-mediated mTORC1 signaling.Drug resistance updates : reviews and commentaries in antimicrobial and anticancer chemotherapy 2025 · CEBM Level 5
- Intermittent and periodic fasting in the treatment of obesity and type 2 diabetes mellitus.Nature reviews. Endocrinology 2025 · CEBM Level 5
- Chemosensory and cardiometabolic improvements after a fasting-mimicking diet: A randomized cross-over clinical trial.Cell reports. Medicine 2025 · CEBM Level 2
- The time is now: accounting for time-of-day effects to improve reproducibility and translation of metabolism research.Nature metabolism 2025 · CEBM Level 5
- Dietary Amino Acids and Risk of Stroke Subtypes: Results from 3 Large Prospective Cohort Studies.The Journal of nutrition 2025 · CEBM Level 3
- Caloric restriction protects from acute and chronic kidney injury by inhibiting monocyte recruitment.iScience 2025 · CEBM Level 5
- Exploring the Relationship Between Insulin Resistance, Liver Health, and Restrictive Lung Diseases in Type 2 Diabetes.Journal of personalized medicine 2025 · CEBM Level 4
- Author Correction: Fasting mimicking diet cycles versus a Mediterranean diet and cardiometabolic risk in overweight and obese hypertensive subjects: a randomized clinical trial.npj metabolic health and disease 2025 · CEBM Level 2
- Periodic fasting induced reconstitution of metabolic flexibility improves albuminuria in patients with type 2 diabetes.Molecular metabolism 2025 · CEBM Level 2
- Restrictive diets have a beneficial impact on dextran sodium sulfate-induced colitis in male mice.The Journal of nutrition 2024 · CEBM Level 5
- Nutrition and dietary restrictions in cancer prevention.Biochimica et biophysica acta. Reviews on cancer 2024 · CEBM Level 5
- Ketone bodies in cell physiology and cancer.American journal of physiology. Cell physiology 2024 · CEBM Level 5
- Cyclic Fasting-Mimicking Diet Plus Bortezomib and Rituximab Is an Effective Treatment for Chronic Lymphocytic Leukemia.Cancer research 2024 · CEBM Level 5
- Fasting-mimicking diet causes hepatic and blood markers changes indicating reduced biological age and disease risk.Nature communications 2024 · CEBM Level 2
- Integration of a fasting-mimicking diet programme in primary care for type 2 diabetes reduces the need for medication and improves glycaemic control: a 12-month randomised controlled trial.Diabetologia 2024 · CEBM Level 2
- Exploring juventology: unlocking the secrets of youthspan and longevity programs.Frontiers in aging 2024 · CEBM Level 5
- Normal or improved cardiovascular risk factors in IGF-I-deficient adults with growth hormone receptor deficiency.Med (New York, N.Y.) 2024 · CEBM Level 3
- Cyclic fasting-mimicking diet in cancer treatment: Preclinical and clinical evidence.Cell metabolism 2024 · CEBM Level 5
- International consensus on fasting terminology.Cell metabolism 2024 · CEBM Level 5
- Nutrition, GH/IGF-1 signaling, and cancer.Endocrine-related cancer 2024 · CEBM Level 5
- Longevity biotechnology: bridging AI, biomarkers, geroscience and clinical applications for healthy longevity.Aging 2024 · CEBM Level 5
- A kidney-specific fasting-mimicking diet induces podocyte reprogramming and restores renal function in glomerulopathy.Science translational medicine 2024 · CEBM Level 4
- Fasting and fasting mimicking diets in cancer prevention and therapy.Trends in cancer 2023 · CEBM Level 5
- Could dietary restrictions affect periodontal disease? A systematic review.Clinical oral investigations 2023 · CEBM Level 5
- Six-month periodic fasting does not affect somatosensory nerve function in type 2 diabetes patients.Frontiers in endocrinology 2023 · CEBM Level 2
- Metabolites and Immune Response in Tumor Microenvironments.Cancers 2023 · CEBM Level 5
- Fasting-Mimicking Diet Inhibits Autophagy and Synergizes with Chemotherapy to Promote T-Cell-Dependent Leukemia-Free Survival.Cancers 2023 · CEBM Level 5
- Biology of Stress Responses in Aging.Aging biology 2023 · CEBM Level 5
- Fasting mimicking diet cycles versus a Mediterranean diet and cardiometabolic risk in overweight and obese hypertensive subjects: a randomized clinical trial.npj metabolic health and disease 2023 · CEBM Level 2
- Fasting-Mimicking Diet Is Safe and Reshapes Metabolism and Antitumor Immunity in Patients with Cancer.Cancer discovery 2022 · CEBM Level 4
- Fasting-Mimicking-Diet does not reduce skeletal muscle function in healthy young adults: a randomized control trial.European journal of applied physiology 2022 · CEBM Level 2
- Association between IGF-1 levels ranges and all-cause mortality: A meta-analysis.Aging cell 2022 · CEBM Level 1
- Nutrition, longevity and disease: From molecular mechanisms to interventions.Cell 2022 · CEBM Level 5
- Yeast Chronological Lifespan: Longevity Regulatory Genes and Mechanisms.Cells 2022 · CEBM Level 5
- Six-Month Periodic Fasting in Patients With Type 2 Diabetes and Diabetic Nephropathy: A Proof-of-Concept Study.The Journal of clinical endocrinology and metabolism 2022 · CEBM Level 2
- Response to: Dealing with menstrual cycle in sport: stop finding excuses to exclude women from research.European journal of applied physiology 2022 · CEBM Level 5
- A Comparison of the Impact of Restrictive Diets on the Gastrointestinal Tract of Mice.Nutrients 2022 · CEBM Level 5
- Fasting and Fasting Mimicking Diets in Obesity and Cardiometabolic Disease Prevention and Treatment.Physical medicine and rehabilitation clinics of North America 2022 · CEBM Level 5
- Fasting renders immunotherapy effective against low-immunogenic breast cancer while reducing side effects.Cell reports 2022 · CEBM Level 5
- Fasting-mimicking diet cycles reduce neuroinflammation to attenuate cognitive decline in Alzheimer's models.Cell reports 2022 · CEBM Level 5
- Breakfast keeps hunger in check.Cell metabolism 2022 · CEBM Level 5
- Fasting and cancer: from yeast to mammals.International review of cell and molecular biology 2022 · CEBM Level 5
- Strategies to Prevent or Remediate Cancer and Treatment-Related Aging.Journal of the National Cancer Institute 2021 · CEBM Level 5
- Quality of life and illness perceptions in patients with breast cancer using a fasting mimicking diet as an adjunct to neoadjuvant chemotherapy in the phase 2 DIRECT (BOOG 2013-14) trial.Breast cancer research and treatment 2021 · CEBM Level 2
- Time-Restricted Eating, Intermittent Fasting, and Fasting-Mimicking Diets in Weight Loss.Current obesity reports 2021 · CEBM Level 5
- Safety and Feasibility of Fasting-Mimicking Diet and Effects on Nutritional Status and Circulating Metabolic and Inflammatory Factors in Cancer Patients Undergoing Active Treatment.Cancers 2021 · CEBM Level 4
- Intermittent and Periodic Fasting, Hormones, and Cancer Prevention.Cancers 2021 · CEBM Level 5
- Fasting-mimicking diet prevents high-fat diet effect on cardiometabolic risk and lifespan.Nature metabolism 2021 · CEBM Level 5
- Diet comparison suggests a lipid imbalance can slow tumour growth.Nature 2021 · CEBM Level 5
- Daily caloric restriction limits tumor growth more effectively than caloric cycling regardless of dietary composition.Nature communications 2021 · CEBM Level 5
- Fasting-mimicking diet blocks triple-negative breast cancer and cancer stem cell escape.Cell metabolism 2021 · CEBM Level 5
- Diet composition influences the metabolic benefits of short cycles of very low caloric intake.Nature communications 2021 · CEBM Level 5
- Intermittent and periodic fasting, longevity and disease.Nature aging 2021 · CEBM Level 5
- Growth hormone receptor deficiency in humans associates to obesity, increased body fat percentage, a healthy brain and a coordinated insulin sensitivity.Growth hormone & IGF research : official journal of the Growth Hormone Research Society and the International IGF Research Society 2020 · CEBM Level 4
- Synergistic effect of fasting-mimicking diet and vitamin C against KRAS mutated cancers.Nature communications 2020 · CEBM Level 5
- Efficacy of a fasting-mimicking diet in functional therapy for depression: A randomised controlled pilot trial.Journal of clinical psychology 2020 · CEBM Level 2
- The mitochondrial derived peptide humanin is a regulator of lifespan and healthspan.Aging 2020 · CEBM Level 4
- Fasting mimicking diet as an adjunct to neoadjuvant chemotherapy for breast cancer in the multicentre randomized phase 2 DIRECT trial.Nature communications 2020 · CEBM Level 2
- Fasting in diabetes treatment (FIT) trial: study protocol for a randomised, controlled, assessor-blinded intervention trial on the effects of intermittent use of a fasting-mimicking diet in patients with type 2 diabetes.BMC endocrine disorders 2020 · CEBM Level 5
- Fasting-mimicking diet and hormone therapy induce breast cancer regression.Nature 2020 · CEBM Level 5
- Fasting, dietary restriction, and immunosenescence.The Journal of allergy and clinical immunology 2020 · CEBM Level 5
- A fasting-mimicking diet and vitamin C: turning anti-aging strategies against cancer.Molecular & cellular oncology 2020 · CEBM Level 5
- Correction to: Fasting in diabetes treatment (FIT) trial: study protocol for a randomised, controlled, assessor-blinded intervention trial on the effects of intermittent use of a fasting-mimicking diet in patients with type 2 diabetes.BMC endocrine disorders 2020 · CEBM Level 5
- Author Correction: Fasting-mimicking diet and hormone therapy induce breast cancer regression.Nature 2020 · CEBM Level 5
- Periodic and Intermittent Fasting in Diabetes and Cardiovascular Disease.Current diabetes reports 2020 · CEBM Level 5
- Programmed longevity, youthspan, and juventology.Aging cell 2019 · CEBM Level 5
- Reply to 'Fasting in oncology: a word of caution'.Nature reviews. Cancer 2019 · CEBM Level 5
- Fasting-Mimicking Diet Modulates Microbiota and Promotes Intestinal Regeneration to Reduce Inflammatory Bowel Disease Pathology.Cell reports 2019 · CEBM Level 5
- Dietary Restrictions and Nutrition in the Prevention and Treatment of Cardiovascular Disease.Circulation research 2019 · CEBM Level 5
- When Fasting Gets Tough, the Tough Immune Cells Get Going-or Die.Cell 2019 · CEBM Level 5
- Protein Quantity and Source, Fasting-Mimicking Diets, and Longevity.Advances in nutrition (Bethesda, Md.) 2019 · CEBM Level 5
- Starvation, Stress Resistance, and Cancer.Trends in endocrinology and metabolism: TEM 2018 · CEBM Level 5
- Periodic fasting starves cisplatin-resistant cancers to death.The EMBO journal 2018 · CEBM Level 5
- Humanin Prevents Age-Related Cognitive Decline in Mice and is Associated with Improved Cognitive Age in Humans.Scientific reports 2018 · CEBM Level 4
- Fasting and cancer: molecular mechanisms and clinical application.Nature reviews. Cancer 2018 · CEBM Level 5
- Impact of intermittent fasting on health and disease processes.Ageing research reviews 2017 · CEBM Level 5
- Brain Structure and Function Associated with Younger Adults in Growth Hormone Receptor-Deficient Humans.The Journal of neuroscience : the official journal of the Society for Neuroscience 2017 · CEBM Level 4
- Nutrition and fasting mimicking diets in the prevention and treatment of autoimmune diseases and immunosenescence.Molecular and cellular endocrinology 2017 · CEBM Level 5
- Effects of Prolonged GRP78 Haploinsufficiency on Organ Homeostasis, Behavior, Cancer and Chemotoxic Resistance in Aged Mice.Scientific reports 2017 · CEBM Level 5
- Fasting-mimicking diet and markers/risk factors for aging, diabetes, cancer, and cardiovascular disease.Science translational medicine 2017 · CEBM Level 2
- Protective effects of short-term dietary restriction in surgical stress and chemotherapy.Ageing research reviews 2017 · CEBM Level 5
- Fasting-Mimicking Diet Promotes Ngn3-Driven β-Cell Regeneration to Reverse Diabetes.Cell 2017 · CEBM Level 5
- Fasting regulates EGR1 and protects from glucose- and dexamethasone-dependent sensitization to chemotherapy.PLoS biology 2017 · CEBM Level 5
- Correction: Fasting regulates EGR1 and protects from glucose- and dexamethasone-dependent sensitization to chemotherapy.PLoS biology 2017 · CEBM Level 5
- Hypothalamic-Pituitary Axis Regulates Hydrogen Sulfide Production.Cell metabolism 2017 · CEBM Level 5
- Interview with Professor Valter Longo.FEMS yeast research 2017 · CEBM Level 5
- The conserved role of protein restriction in aging and disease.Current opinion in clinical nutrition and metabolic care 2016 · CEBM Level 5
- Growth factors, aging and age-related diseases.Growth hormone & IGF research : official journal of the Growth Hormone Research Society and the International IGF Research Society 2016 · CEBM Level 5
- Dietary restriction with and without caloric restriction for healthy aging.F1000Research 2016 · CEBM Level 5
- Dietary Interventions, Cardiovascular Aging, and Disease: Animal Models and Human Studies.Circulation research 2016 · CEBM Level 5
- A Diet Mimicking Fasting Promotes Regeneration and Reduces Autoimmunity and Multiple Sclerosis Symptoms.Cell reports 2016 · CEBM Level 2
- Safety and feasibility of fasting in combination with platinum-based chemotherapy.BMC cancer 2016 · CEBM Level 4
- Fasting, Circadian Rhythms, and Time-Restricted Feeding in Healthy Lifespan.Cell metabolism 2016 · CEBM Level 5
- Fasting-Mimicking Diet Reduces HO-1 to Promote T Cell-Mediated Tumor Cytotoxicity.Cancer cell 2016 · CEBM Level 5
- Association of Animal and Plant Protein Intake With All-Cause and Cause-Specific Mortality.JAMA internal medicine 2016 · CEBM Level 3
- Fasting and Caloric Restriction in Cancer Prevention and Treatment.Recent results in cancer research. Fortschritte der Krebsforschung. Progres dans les recherches sur le cancer 2016 · CEBM Level 5
- Targeting Cancer Metabolism: Dietary and Pharmacologic Interventions.Cancer discovery 2016 · CEBM Level 5
- Enhancing Stem Cell Transplantation with "Nutri-technology".Cell stem cell 2016 · CEBM Level 5
- A protein restriction-dependent sulfur code for longevity.Cell 2015 · CEBM Level 5
- Starvation promotes REV1 SUMOylation and p53-dependent sensitization of melanoma and breast cancer cells.Cancer research 2015 · CEBM Level 5
- Interventions to Slow Aging in Humans: Are We Ready?Aging cell 2015 · CEBM Level 5
- Fasting induces anti-Warburg effect that increases respiration but reduces ATP-synthesis to promote apoptosis in colon cancer models.Oncotarget 2015 · CEBM Level 5
- Fasting potentiates the anticancer activity of tyrosine kinase inhibitors by strengthening MAPK signaling inhibition.Oncotarget 2015 · CEBM Level 5
- GH Receptor Deficiency in Ecuadorian Adults Is Associated With Obesity and Enhanced Insulin Sensitivity.The Journal of clinical endocrinology and metabolism 2015 · CEBM Level 4
- A Periodic Diet that Mimics Fasting Promotes Multi-System Regeneration, Enhanced Cognitive Performance, and Healthspan.Cell metabolism 2015 · CEBM Level 2
- Dysregulated metabolism contributes to oncogenesis.Seminars in cancer biology 2015 · CEBM Level 5
- Designing a broad-spectrum integrative approach for cancer prevention and treatment.Seminars in cancer biology 2015 · CEBM Level 5
- Fasting plus tyrosine kinase inhibitors in cancer.Aging 2015 · CEBM Level 5
- Prolonged fasting reduces IGF-1/PKA to promote hematopoietic-stem-cell-based regeneration and reverse immunosuppression.Cell stem cell 2014 · CEBM Level 5
- IGF-I regulates the age-dependent signaling peptide humanin.Aging cell 2014 · CEBM Level 5
- Medical research: treat ageing.Nature 2014 · CEBM Level 5
- Protein and amino acid restriction, aging and disease: from yeast to humans.Trends in endocrinology and metabolism: TEM 2014 · CEBM Level 5
- Meal frequency and timing in health and disease.Proceedings of the National Academy of Sciences of the United States of America 2014 · CEBM Level 5