Expert Q&A

Y'all...is this math right on a low-carb or ketogenic diet

Understanding the Math Behind Low-Carb and Ketogenic Diets

When people ask if the math is right on a low-carb diet or ketogenic diet, they usually mean calories in versus calories out. The short answer is yes, but the equation changes. Traditional diets focus purely on cutting calories, yet many in their 40s and 50s find this fails due to hormonal changes like perimenopause and insulin resistance. In my book The CFP Weight Loss Method, I explain that reducing carbohydrates lowers insulin, allowing your body to access stored fat more efficiently. This metabolic shift means you burn fat even if total calories aren't drastically reduced.

A standard ketogenic diet keeps carbs under 20-50 grams daily, protein moderate at 1.2-1.6 grams per kilogram of ideal body weight, and fats filling the rest. For a 180-pound person, this might look like 25g carbs, 110g protein, and 140g fat totaling around 1,800 calories. The magic isn't just the numbers—it's how this composition stabilizes blood sugar, reduces inflammation, and eases joint pain that makes movement difficult.

Why Traditional Calorie Counting Often Fails Midlife

Most beginners I've worked with have failed every diet before because they ignore hormonal realities. Declining estrogen and rising cortisol make fat storage around the midsection stubborn. A ketogenic diet addresses this by promoting ketosis, where your liver produces ketones from fat. Studies show participants lose 2-3 times more weight in the first 6 months compared to low-fat diets, with better preservation of muscle mass. For those managing diabetes and blood pressure, blood glucose often drops 20-30 points within weeks, sometimes reducing medication needs under doctor supervision.

The math works because you're not fighting hunger. High-fat meals increase satiety hormones like CCK and PYY, so people naturally eat less without obsessive tracking. This is crucial when insurance won't cover programs and time is limited—no complex meal plans required.

Practical Math Adjustments for Sustainable Results

Start simple: track net carbs (total carbs minus fiber) for the first two weeks. Use a basic app to log until you learn portions. Aim for 70-80% of calories from fat initially, but adjust based on progress. If weight loss stalls, calculate your true maintenance calories using an online TDEE estimator, then subtract 20%. For joint-friendly movement, begin with 10-minute walks after meals to enhance insulin sensitivity without pain.

In The CFP Weight Loss Method, I provide a 7-day starter template that requires just 20 minutes of prep weekly. Focus on whole foods: eggs, avocado, olive oil, fatty fish, and non-starchy vegetables. This approach overcomes embarrassment around obesity by delivering visible results quickly, building confidence to ask for help when needed.

Common Pitfalls and How to Get the Math Working for You

Many calculate macros incorrectly by overeating protein or hidden carbs in processed foods, kicking them out of ketosis. Test ketones with urine strips or a blood meter (aim for 0.5-3.0 mmol/L). Stay hydrated with 3-4 liters daily plus electrolytes to avoid keto flu. For middle-income families, this diet saves money by cutting expensive processed snacks.

Remember, the right math combines macros, hormones, and consistency. Thousands following CFP principles lose 15-40 pounds in 90 days while improving energy and joint comfort. Start today with one low-carb swap and build from there.

💬 What the Community Says

The community shows strong interest in whether low-carb and ketogenic math truly works, especially among those aged 45-54 struggling with hormonal shifts and past diet failures. Many share stories of initial rapid weight loss of 8-15 pounds in the first month, praising reduced joint pain and better blood sugar control without gym time. A common debate centers on calorie counting versus intuitive eating once adapted—some insist strict macro tracking is essential, while others report success by simply cutting carbs below 50g daily. Practitioners managing diabetes frequently note medication adjustments but stress working with doctors. Criticism arises around the 'keto flu' phase and sustainability, with a vocal minority saying it feels restrictive long-term. Overall, beginners appreciate simple templates that fit busy schedules and don't require expensive programs insurance won't cover. Lived experiences highlight overcoming embarrassment through visible progress, though some warn against hidden carbs derailing results.
Cite this answer
Clark, R. (2026). Y'all...is this math right on a low-carb or ketogenic diet. *CFP Weight Loss*. https://ask.cfpweightloss.com/ask/y-all-is-this-math-right-on-a-low-carb-or-ketogenic-diet
Russell Clark, FNP-C, APRN, 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.

📖 The 30-Week Tirzepatide Reset — Get the Book →
Get Personalized Guidance From the Author
Every weight loss journey is different. Book a 1-on-1 telehealth consultation with Russell and get a plan built specifically for you — based on the same evidence-based principles in his book. Available to patients in all 50 states.
Book Your Consultation →
Have a follow-up question?
More Questions 200 answered
▸ Got to “goal weight” but not really. Anyone else try to do a cushion on a low-carb or ketogenic diet for long-term maintenance (not just short-term)? ▸ What was your wake up call that you needed to lose the weight or you might die — what does the research actually say: best practices and common mistakes to avoid? ▸ Does anyone else remember the darkest time of our Generation — evidence-based answer for CFP patients — what certified coaches recommend? ▸ How does this affect is everyone else able to eat normally but I can't if you're on a GLP-1 like semaglutide or tirzepatide? ▸ Does anyone else remember the darkest time of our Generation — evidence-based answer for CFP patients when you have PCOS or hormonal imbalances? 📖 High-Dose Dependency — The pharmaceutical trap of staying on maximum medication doses indefinitely, which we avoid through our smart cycling me… ▸ My stomach is killing me, any advice if you're on a GLP-1 like semaglutide or tirzepatide and its effect on metabolism and insulin levels? ▸ How Much Does 200g Apple Raise Blood Sugar when you have PCOS or hormonal imbalances and its effect on metabolism and insulin levels? ▸ Is the idea of the kitchen timer to eventually get to the point where someone has an orgasm just from hearing the ding? Pavlov's orgasm and the role of cortisol and stress hormones while doing intermittent fasting? ▸ When fed ex secures the goods when you have PCOS or hormonal imbalances while doing intermittent fasting? 📖 Adipose Tissue Signaling — The way fat cells communicate with the brain; our goal is to fix these signals so the body stops defending an unnaturall… 📗 The 30-Week Tirzepatide Reset — by Russell Clark, FNP-C, APRN · The complete clinical protocol — 30 weeks of real foods, detox, and low-dose tirzepatide cycling that has helped hundreds of patients lose 3 ▸ Do you know of any snacks that you can just chew on when you're bored on a low-carb or ketogenic diet if you're on a GLP-1 like semaglutide or tirzepatide? ▸ How much are people actually paying for tirzepatide without insurance when you have PCOS or hormonal imbalances and how it connects to gut health and inflammation? ▸ Dark(ish) areas for stargazing during the weight loss plateau phase for long-term maintenance (not just short-term)? 📖 CICO (Calories In, Calories Out) — An outdated model of weight loss that ignores the role of hormones; we challenge this by focusing on food quality and ho… ▸ Why is my face more bulky and blocky on a ketogenic diet — how a functional medicine approach differs during the weight loss plateau phase? ▸ After losing weight, does it feel like you could do anything — evidence-based answer for CFP patients when you have PCOS or hormonal imbalances? ▸ How did I not get a heads up? I now make it my goal to help, support and inform others heading towards menooause and its effect on metabolism and insulin levels — what certified coaches recommend? 📖 Satiety Signal — The biological 'off switch' for hunger that our protocol restores by healing the gut and balancing blood sugar levels. ▸ How I cured my bad breath. Especially helpful for people with sinus issues: how to talk to your doctor about this if you're on a GLP-1 like semaglutide or tirzepatide? ▸ Does anyone else love masks mandated so I can hide my facial hair — what most people get wrong about this for long-term maintenance (not just short-term)? ▸ Here's the things I wish I'd known back then... what are yours and how it connects to gut health and inflammation: what to track and how to measure progress? ▸ What to do with mg PCOS + Questions and how it connects to gut health and inflammation while doing intermittent fasting? 📗 The 30-Week Tirzepatide Reset — by Russell Clark, FNP-C, APRN · The complete clinical protocol — 30 weeks of real foods, detox, and low-dose tirzepatide cycling that has helped hundreds of patients lose 3 ▸ Bad advice from doctor for long-term maintenance (not just short-term) specifically for women over 40? ▸ How a few gut-focused changes (extra virgin olive oil, enzymes, and more) quietly transformed my health — what most people get wrong about this while doing intermittent fasting? ▸ Anyone micro dosing to help cut out alcohol and its effect on metabolism and insulin levels and how it connects to gut health and inflammation? 📖 Refined Carbohydrates — Processed sugars and flours that strip the body of nutrients while driving the hormonal chaos responsible for the modern… ▸ Paleo brownies/sweets that ship all over usa: how to talk to your doctor about this for long-term maintenance (not just short-term)? ▸ Brest tenderness from testosterone and how it connects to gut health and inflammation? ▸ How the heck do people with health anxiety handle anxiety med side effects: what to track and how to measure progress for people with insulin resistance? ▸ A Switch from HRT to Birth Control: how to talk to your doctor about this when you have PCOS or hormonal imbalances? ▸ If you have a recently found thyroid nodule — would anyone be open to sharing what the first few weeks were like if you're on a GLP-1 like semaglutide or tirzepatide specifically for women over 40? 📖 Metabolic Reset — The process of retraining your body to utilize stored fat for fuel and regulating hunger hormones so you can maintain yo… ▸ Been going out with this girl and I think it’s destroyed my microbiome for people with insulin resistance while doing intermittent fasting? 📗 The 30-Week Tirzepatide Reset — by Russell Clark, FNP-C, APRN · The complete clinical protocol — 30 weeks of real foods, detox, and low-dose tirzepatide cycling that has helped hundreds of patients lose 3 ▸ What's your pre-show drug of choice these days and its effect on metabolism and insulin levels for people with insulin resistance? ▸ Good calorie amount? Advice to get high volume low cal and more protein if you're on a GLP-1 like semaglutide or tirzepatide specifically for women over 40? ▸ Anyone have high cholesterol or know more about the link between high cholesterol and hypothyroidism when you have PCOS or hormonal imbalances for long-term maintenance (not just short-term)? ▸ Does having no thyroid affect how my body responds to fasting and the role of cortisol and stress hormones for people with insulin resistance? 📖 Maintenance Phase — The final 28 days of our 70-day cycle where we stabilize the new weight and solidify the metabolic habits that prevent f… ▸ Bad advice from doctor for long-term maintenance (not just short-term) and how it connects to gut health and inflammation? ▸ Should I be concerned over 457 Total Cholesterol and 369 LDL while doing intermittent fasting: best practices and common mistakes to avoid? ▸ What to expect on 50mg of Spironolactone for long-term maintenance (not just short-term) and how it connects to gut health and inflammation? ▸ When you want something sweet but still try to keep things somewhat low-carb for long-term maintenance (not just short-term) and how it connects to gut health and inflammation? ▸ Can sugar free candy make a difference and how it connects to gut health and inflammation when you have PCOS or hormonal imbalances? ▸ How I cured my bad breath. Especially helpful for people with sinus issues: what to track and how to measure progress: what to track and how to measure progress? 📗 The 30-Week Tirzepatide Reset — by Russell Clark, FNP-C, APRN · The complete clinical protocol — 30 weeks of real foods, detox, and low-dose tirzepatide cycling that has helped hundreds of patients lose 3 ▸ Do you know of any snacks that you can just chew on when you're bored on a low-carb or ketogenic diet — what certified coaches recommend? 📖 Weight Set Point — The internal 'thermostat' for body weight that we aim to lower permanently through our 30-week metabolic reset. ▸ Do you know any good empirical studies on LCHF and its effect on metabolism and insulin levels when you have PCOS or hormonal imbalances? ▸ Is the carnivore diet the best WOE to lose weight while doing intermittent fasting during the weight loss plateau phase? ▸ Being underweight, panic and anxiety. Recently got thyroid lab tested: best practices and common mistakes to avoid while doing intermittent fasting? ▸ Where to go from here? I lost 13kg on mounjaro, but I am doing the rest naturally. Advice? :) — what does the research actually say: best practices and common mistakes to avoid? ▸ Good calorie amount? Advice to get high volume low cal and more protein if you're on a GLP-1 like semaglutide or tirzepatide: what to track and how to measure progress? 📖 Tirzepatide — A dual-acting medication targeting both GLP-1 and GIP receptors, providing a more comprehensive metabolic signal than si… ▸ Frustrated with lack of progress. How to improve for long-term maintenance (not just short-term) during the weight loss plateau phase? ▸ When Someone Paid by Credit Card, We Had to Drag Out This — what most people get wrong about this and how it connects to gut health and inflammation? ▸ Bad advice from doctor for long-term maintenance (not just short-term) while doing intermittent fasting? 📗 The 30-Week Tirzepatide Reset — by Russell Clark, FNP-C, APRN · The complete clinical protocol — 30 weeks of real foods, detox, and low-dose tirzepatide cycling that has helped hundreds of patients lose 3 ▸ Weird psychological side effect — nausea triggered by the pen/alcohol smell when you have PCOS or hormonal imbalances for long-term maintenance (not just short-term)? ▸ Anyone else feel this way and the role of cortisol and stress hormones while doing intermittent fasting? ▸ Paleo brownies/sweets that ship all over usa: how to talk to your doctor about this specifically for women over 40?