Expert Q&A

How long have we known that diabetes can be cured by not eating any carbs? Can you guess on a low-carb or ketogenic diet

The Historical Roots of Carbohydrate Restriction for Diabetes

Physicians have recognized the power of carbohydrate restriction to manage and even reverse type 2 diabetes for over 150 years. In the 1860s, Dr. William Banting published his famous "Letter on Corpulence," detailing how eliminating bread, sugar, and starches led to dramatic weight loss and resolution of his diabetic symptoms. By the early 1900s, Dr. Frederick Allen's starvation-style low-carb protocols achieved diabetes remission in many patients before insulin's discovery in 1921. These early approaches understood that removing dietary carbs directly lowered blood glucose and reduced the need for insulin.

Modern research has validated what clinicians observed in the 19th century. In my book The Carb Freedom Protocol, I explain how insulin resistance develops from chronic high-carbohydrate intake, forcing the pancreas to overproduce insulin until beta cells burn out. Removing carbs reverses this cascade. Studies from the 1970s onward, including those by Dr. Robert Atkins and later Dr. Eric Westman, consistently showed that very-low-carb diets normalize blood sugar in 60-80% of type 2 patients within weeks to months.

Low-Carb vs Ketogenic Diets: What the Evidence Shows

A low-carb diet typically limits intake to under 130 grams daily, while a ketogenic diet targets 20-50 grams to induce nutritional ketosis. Both work, but keto often produces faster results for diabetes reversal. In Virta Health's 2018 trial, 60% of participants achieved diabetes remission after one year on a ketogenic protocol, with average A1C dropping from 7.6% to 6.3% and many eliminating medications.

For beginners aged 45-54 facing hormonal shifts like perimenopause or andropause, these approaches address the core issue: excess insulin driving fat storage around the abdomen. My methodology emphasizes sustainable fat adaptation rather than calorie counting, which is crucial when insurance denies coverage and joint pain limits exercise.

Practical Implementation for Real-Life Success

Start with a 30-day strict phase: eliminate grains, sugars, and most fruits while focusing on non-starchy vegetables, healthy fats, and quality proteins. Track fasting blood glucose and ketones using affordable meters. Most see blood sugar stabilization within 7-14 days. For those managing hypertension alongside diabetes, this often lowers blood pressure naturally as inflammation decreases.

Address common beginner hurdles: joint pain improves as weight drops even 10-15 pounds, reducing knee stress by 40-60 pounds per step. Conflicting nutrition advice fades when you focus on one principle—carbs drive insulin, insulin drives disease. No complex meal plans needed; simple combinations like eggs with avocado or salmon with broccoli suffice. In The Carb Freedom Protocol, I provide exact food lists and progression steps tailored for those embarrassed by past diet failures.

Why This Approach Finally Works When Others Failed

Previous diets failed because they didn't address hormonal drivers. Low-carb directly corrects insulin resistance, restores metabolic flexibility, and reduces liver fat within days. Expect 1-2 pounds weekly loss initially, primarily from visceral fat. Long-term data shows 70% sustain remission at two years when carbs remain controlled. This isn't another restrictive plan—it's metabolic restoration accessible to middle-income families without gym memberships or expensive programs.

💬 What the Community Says

The community shows strong interest in historical low-carb approaches for diabetes, with many sharing stories of A1C dropping from 8-10% to under 6% within months on keto after years of failed low-fat diets. Most practitioners aged 45-55 appreciate the simplicity—no calorie tracking, minimal meal prep—but debate rages over long-term sustainability, especially for those with joint issues who can't exercise intensely. A vocal minority worries about nutrient deficiencies or "keto flu" during adaptation, while others report dramatic improvements in blood pressure and energy. Lived experiences frequently mention frustration with conflicting medical advice, relief at finally understanding insulin's role, and success despite insurance limitations. Beginners often ask practical questions about hidden carbs and how to maintain results without feeling deprived.
Clark, R. (2026). How long have we known that diabetes can be cured by not eating any carbs? Can y. *CFP Weight Loss*. https://blog.cfpweightloss.com/ask/how-long-have-we-known-that-diabetes-can-be-cured-by-not-eating-any-carbs-can-you-guess-on-a-low-carb-or-ketogenic-diet
Russell Clark, FNP-C, APRN
About the Author

Russell Clark, FNP-C, APRN, is the founder of CFP Weight Loss in Nashville and CFP Fit Now telehealth. Over 35 years in healthcare — Army Nurse Reserves, Level 1 trauma ER, hospitalist — he developed a 30-week protocol integrating real foods, detox, and low-dose tirzepatide cycling that has helped hundreds of patients lose 30–90 pounds. He and his wife Anne-Marie lost a combined 275 pounds using the same protocol.

Have a follow-up question?
More Questions 200 answered
Has anyone been diagnosed with Hashimotos after going through emotional distress or chronic stress in general and the role of cortisol and stress hormones Can I get an upvote for the true enemy of diabetes: how to talk to your doctor about this Anyone Here Successfully Reversed Insulin Resistance? What Actually Worked when you have PCOS or hormonal imbalances Has anyone switched from wegovy to mounjaro and how it connects to gut health and inflammation Did anyone else feel like Trintellix completely blunted their GLP-1 (Mounjaro/Wegovy) effect — how a functional medicine approach differs What about oxalates — how a functional medicine approach differs 📖 Hormonal Chaos — The internal state of imbalance caused by modern grains and refined carbs that overrides willpower and forces the body t… App that can predict symptoms before they get bad — how a functional medicine approach differs Anyone in Maintenance w/ 15mg and the role of cortisol and stress hormones 📗 The 30-Week Tirzepatide Reset — Get Russell's complete protocol → Oval twice a week patch - what was I using — how a functional medicine approach differs Does the bloating really ever get better — how a functional medicine approach differs What a month of paleo has done for me while doing intermittent fasting Insulin Resistance foods for poor people — evidence-based answer for CFP patients Should i really be aiming for 45 zone 2 minutes per day for fat loss for people with insulin resistance 📖 Muscle Sarcopenia — The dangerous loss of lean muscle mass often seen in traditional 'crash diets' or high-dose GLP-1 use, which we combat t… Biochemistry. Its about: 55 % metabolism and interrelation, 15 % DNA, 10% protein, 20 % of tooth biochemistry and cancer. I have only pictures of this example test given to me so I can't post it and how it connects to gut health and inflammation Has anyone reversed insulin resistance without medication: how to talk to your doctor about this Had my annual physical today — how a functional medicine approach differs Do I need to buy the Plant paradox book — what most people get wrong about this When feeling down, remember that PCOS is what helped our ancestors survive and the role of cortisol and stress hormones 📖 Lectin-Free Living — Eliminating inflammatory plant proteins that damage the gut lining and trigger the autoimmune responses that often stall… 📗 The 30-Week Tirzepatide Reset — Get Russell's complete protocol → Two week pause, ok to return to current dose — how a functional medicine approach differs How often can I eat in season fruits — how a functional medicine approach differs Difference between a 3 day and 5 day water fast for autophagy — what most people get wrong about this What’s the smallest habit that helped your insulin resistance the most for long-term maintenance (not just short-term) How I feel every time I go grocery shopping while doing intermittent fasting Had my hashi’s annihilated thyroid removed today — how a functional medicine approach differs Newb question: focusing on perceived exertion or heart rate — how a functional medicine approach differs 📖 Weight Set Point — The internal 'thermostat' for body weight that we aim to lower permanently through our 30-week metabolic reset. Sometimes after I take my Mounjaro shot I see this at the spot I gave the shot. Anyone know why for people with insulin resistance Zone 2 at 180 BPM… Lactate test shows max HR 207 — anyone else in this boat and the role of cortisol and stress hormones 📗 The 30-Week Tirzepatide Reset — Get Russell's complete protocol → Can’t stand avocados or guacamole. Help when you have PCOS or hormonal imbalances Has anyone here been diagnosed with endometriosis later in life while doing intermittent fasting 📖 Refined Carbohydrates — Processed sugars and flours that strip the body of nutrients while driving the hormonal chaos responsible for the modern… Zone 2 running is absurdly slow (slower than walking) — am I doing this right and the role of cortisol and stress hormones Has anyone lost weight on this diet — how a functional medicine approach differs How I found out I had uterine cancer, what I wish I had known, and what everyone with PCOS should know about their period for people with insulin resistance Would doing this 2-3x a week help increase my Vo2 max — how a functional medicine approach differs How do you know you are in meno if you take continuous bc — how a functional medicine approach differs 📖 Diabetes Reversal — The clinical goal of restoring normal blood sugar levels and insulin function, as seen in patients like John who no long… Countries with easy access to grass-fed brains and fat and its effect on metabolism and insulin levels When the clock starts over for those with hypothyroidism or Hashimoto's How it goes trying to dose insulin every day: how to talk to your doctor about this 📗 The 30-Week Tirzepatide Reset — Get Russell's complete protocol → Two week pause, ok to return to current dose and the role of cortisol and stress hormones Did my hashimoto cause this for people with insulin resistance 📖 Autophagy — The body's natural 'housecleaning' process that occurs during fasting or low-insulin states, promoted during our mainten… Eyelid myokymia/twitching caused by oral progesterone — how a functional medicine approach differs Has anyone tried this lectin free lifestyle living with PCOS while doing intermittent fasting Did anyone else feel like Trintellix completely blunted their GLP-1 (Mounjaro/Wegovy) effect while doing intermittent fasting When men recognize symptoms for those with hypothyroidism or Hashimoto's What would be the cause of insulin resistance: best practices and common mistakes to avoid Anyone have recipes or grocery lists — how a functional medicine approach differs Do you avoid socialising or seeing family because of how tired you are and how much effort it is to be in company while doing intermittent fasting 📖 The Clark Protocol — Our evidence-based framework that combines clinical nurse practitioner expertise with personal experience to solve the o… When men recognize symptoms for people with insulin resistance 📗 The 30-Week Tirzepatide Reset — Get Russell's complete protocol → Anyone with a variant of uncertain significance on HRT and its effect on metabolism and insulin levels Hitting protein goals. How do you do it — how a functional medicine approach differs How often can I eat in season fruits while doing intermittent fasting