Expert Q&A

Lost 3 and a half kg in my first 3 days…is this normal: how to talk to your doctor about this

Understanding Your Rapid Initial Drop

Losing 3.5 kg in the first three days is surprisingly common for beginners, especially those over 45 dealing with hormonal changes. In my work with thousands of patients through the CFP Weight Loss method, this early drop is rarely pure fat. Instead, it reflects glycogen depletion and water weight loss. Each gram of glycogen holds about 3-4 grams of water; when you reduce carbs or calories sharply, your body releases this stored fluid. For someone with insulin resistance or diabetes, this effect can be even more pronounced as blood sugar stabilizes.

Expect 0.5-1 kg of true fat loss per week after this initial phase. The first week often shows 2-5 kg total because of reduced inflammation and sodium shifts. If you're experiencing joint pain, this fluid reduction can actually ease discomfort, making movement feel more possible despite past exercise struggles.

When to Celebrate Versus When to Monitor

This pace isn't sustainable or healthy long-term. True metabolic change from the CFP approach focuses on sustainable fat loss of 0.5-1% of body weight weekly. Losing faster risks muscle loss, which slows metabolism further—exactly what many middle-income adults fear after failed diets. Track symptoms: dizziness, fatigue, or constipation signal you may need to increase electrolytes or protein. Those managing blood pressure should monitor readings daily, as fluid shifts can affect them.

In my book, I emphasize rebuilding confidence by distinguishing "scale wins" from real progress. Measure waist circumference and energy levels too. If your 3.5 kg includes significant bloating reduction, that's a win for hormonal balance.

How to Talk to Your Doctor About Rapid Weight Loss

Many feel embarrassed discussing obesity or quick results, especially when insurance won't cover programs. Prepare by logging your daily intake, symptoms, and measurements for two weeks. Start the conversation: "I've started a structured eating pattern and lost 3.5 kg in three days. My blood sugar feels steadier, but I'm concerned about sustainability. Can we check my electrolytes and thyroid?"

Bring specific questions: "Given my age and joint issues, how do we protect muscle while continuing?" Share that conflicting nutrition advice overwhelmed you before, and this feels different. Most doctors respond positively to data-driven patients. Request basic labs—comprehensive metabolic panel, A1C, and lipid profile—to track diabetes and blood pressure improvements. If they seem dismissive, ask for a referral to a registered dietitian covered by insurance.

Building Sustainable Momentum After the Initial Loss

Transition now to the core CFP principles: balanced plates with 30g protein per meal, consistent meal timing within your schedule, and gentle movement that respects joint pain. Walk 10-15 minutes after meals instead of gym intimidation. This prevents rebound and addresses the hormonal barriers making weight harder to lose after 45. Reassess in two weeks—most see another 1-2 kg drop while feeling energized, not deprived. Remember, real success rebuilds trust in your body after years of diet failure.

💬 What the Community Says

In online forums, many adults aged 45-55 report losing 2-4 kg in the first few days of new programs and wonder if it's normal. The community is split between excitement about the "whoosh" effect from water weight and worry it signals muscle loss or unsustainable restriction. Beginners with hormonal issues or diabetes often share that doctors dismissed early losses until they presented symptom logs and lab requests. A vocal minority describes joint pain easing quickly, boosting confidence to continue despite insurance limitations and time constraints. Most practitioners find discussing results gets better responses when focusing on blood pressure improvements rather than the scale alone. Lived experiences highlight embarrassment fading once they realize rapid starts are common but require follow-up monitoring to avoid yo-yo patterns seen in past diet attempts.
Cite this answer
Clark, R. (2026). Lost 3 and a half kg in my first 3 days…is this normal: how to talk to your doct. *CFP Weight Loss*. https://ask.cfpweightloss.com/ask/lost-3-and-a-half-kg-in-my-first-3-days-is-this-normal-how-to-talk-to-your-doctor-about-this
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
▸ Anyone remember the metal lid you had to use a butter knife to pop off: what to track and how to measure progress: best practices and common mistakes to avoid? ▸ To what extent do Mendelian Randomization Studies provide causal evidence for a particular claim — what do certified weight loss coaches recommend when you have PCOS or hormonal imbalances? ▸ The cost of meat is soaring, especially beef. What are y’all doing to stay on budget on a low-carb or ketogenic diet? ▸ Probiotics worked for a month then stopped. Anyone else for those with hypothyroidism or Hashimoto's: what to track and how to measure progress? ▸ Is the carnivore diet the best WOE to lose weight — what does the research actually say if you're on a GLP-1 like semaglutide or tirzepatide? ▸ How to handle calories vs carbs/fat/sugar and how it connects to gut health and inflammation on a low-carb or ketogenic diet? ▸ How I Lost 22lbs in 3 Months (155→133lbs at 5'8") after not being able to lose weight for a long time if you're on a GLP-1 like semaglutide or tirzepatide during the weight loss plateau phase? 📖 Inflammatory Markers — Clinical indicators like CRP that we monitor to ensure the body is moving from a state of disease to a state of vibrant … ▸ Sugar free pudding with greek yogurt — evidence-based answer for CFP patients for long-term maintenance (not just short-term)? ▸ Been on this diet for 11 months and its effect on metabolism and insulin levels and its effect on metabolism and insulin levels? ▸ Anyone remember the metal lid you had to use a butter knife to pop off: what to track and how to measure progress 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 ▸ I am on my second week of mounjaro (2.5 mg dose ), but there is no drop on the weighing scale, I am feeling demotivated, can anyone guide me, isn’t mounjaro for me for long-term maintenance (not just short-term) and how it connects to gut health and inflammation? ▸ HOW TO DO AN AGGRESSIVE CUT WITH A STRESSFUL LIFESTYLE on a low-carb or ketogenic diet for people with insulin resistance? 📖 Hashimoto’s Success — Achieving weight loss and reduced inflammation in thyroid patients by removing dietary triggers like lectins and modern … ▸ What can I ask for if estrodiol cream remains in shortage? Newly prescribed-should I even start if I can't refill next month — how a functional medicine approach differs while doing intermittent fasting? ▸ When the fatigue is real: how to talk to your doctor about this for people with insulin resistance? ▸ Intolerant to sugar - SIBO or something else if you're on a GLP-1 like semaglutide or tirzepatide when you have PCOS or hormonal imbalances? ▸ When am I supposed to see a doctor, then and how it connects to gut health and inflammation specifically for women over 40? ▸ Do yall ever daydream of who you were before your diagnosis when you have PCOS or hormonal imbalances when you have PCOS or hormonal imbalances? ▸ If a random dance partner app existed .. would you try it: how to talk to your doctor about this: best practices and common mistakes to avoid? ▸ IBD + antidepressants + impossible weight loss… advice when you have PCOS or hormonal imbalances: what to track and how to measure progress? 📖 Tirzepatide Micro-Dosing — The practice of using the lowest effective dose to achieve results, minimizing side effects while maximizing the longevi… ▸ Crust check 🔥 ribeye done right when you have PCOS or hormonal imbalances? 📗 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 ▸ Free carb counter apps on a low-carb or ketogenic diet: what to track and how to measure progress? ▸ Who still goes to steeplechase — what do certified weight loss coaches recommend for long-term maintenance (not just short-term)? ▸ Did L. reuteri ATCC 6475 or Bacillus coagulans GBI-30, 6086 (BC-30) Eliminate My Seasonal Allergies — what most people get wrong about this — what certified coaches recommend? 📖 Hidden Hunger — A state where the body is overfed but undernourished, leading to constant cravings because the brain isn't receiving the… ▸ Coke Zero gave me heart palpitations: what to track and how to measure progress for those with hypothyroidism or Hashimoto’s? ▸ Omnipod. Starting an insulin pump help while doing intermittent fasting for long-term maintenance (not just short-term)? ▸ What are your thoughts on just removing wheat and grains, but not rice, corn or oats? Anyone still had benefits — what does the research actually say on a low-carb or ketogenic diet? 📖 30-Week Tirzepatide Reset — Our signature protocol using a single 60 mg box of medication cycled over 30 weeks to achieve lasting metabolic transfor… ▸ Were any of you guys fans of Journey? How big were they when you have PCOS or hormonal imbalances? ▸ Sugar free 2020, who's with me — what most people get wrong about this: 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 ▸ Does drinking Sparkling Ice (flavored sparkling water - 5 calories per bottle) during my fasting window break my fast and the role of cortisol and stress hormones during the weight loss plateau phase? ▸ How does chasing skinny ever get old for long-term results while doing intermittent fasting? ▸ What foods to stock for overnight guest — evidence-based answer for CFP patients: what to track and how to measure progress? 📖 Metabolic Reset — The process of retraining your body to utilize stored fat for fuel and regulating hunger hormones so you can maintain yo… ▸ Difference between a 3 day and 5 day water fast for autophagy and the role of cortisol and stress hormones on a low-carb or ketogenic diet? ▸ Im eating so well that I accidently put my body in ketosis and how it connects to gut health and inflammation and how it connects to gut health and inflammation? ▸ Testosterone how long does it take to work while doing intermittent fasting if you're on a GLP-1 like semaglutide or tirzepatide? ▸ Exercise — when and what kind while fasting, and does it enhance autophagy — how a functional medicine approach differs specifically for women over 40? ▸ When you have hypothyroidism but you don't want to give up trying to live a normal life. 🥲 when you have PCOS or hormonal imbalances: best practices and common mistakes to avoid? 📗 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 ▸ Good calorie amount? Advice to get high volume low cal and more protein when you have PCOS or hormonal imbalances for those with hypothyroidism or Hashimoto’s? ▸ Traveling with IBS-D to a 5-day conference in San Diego: how do you manage food — what most people get wrong about this during the weight loss plateau phase? 📖 The Clark Protocol — Our evidence-based framework that combines clinical nurse practitioner expertise with personal experience to solve the o… ▸ What are the wegovy doses in order on a low-carb or ketogenic diet when you have PCOS or hormonal imbalances? ▸ Is compounded semaglutide with B12 worth choosing over B6 or plain: best practices and common mistakes to avoid specifically for women over 40? ▸ When you want something sweet but still try to keep things somewhat low-carb and how it connects to gut health and inflammation on a low-carb or ketogenic diet? ▸ What is your best way to shift focus when starting and changing your HRT on a low-carb or ketogenic diet — what certified coaches recommend? 📖 Nutrient Density — Prioritizing foods that provide maximum vitamins and minerals per calorie to satisfy the brain and end the cycle of hidd… ▸ What can I ask for if estrodiol cream remains in shortage? Newly prescribed-should I even start if I can't refill next month — how a functional medicine approach differs — what the research actually says? ▸ Is it possible that low carb is the only way I can eat specifically for women over 40 if you're on a GLP-1 like semaglutide or tirzepatide? 📗 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 ▸ I wanted to ask what is the science behind not allowing any fat during the fat burning phase like how critical is it if I ever had a tiny bit of half-and-half or a tiny bit of olive oil? Is it really do something to the body. 📖 Gut-Brain Axis — The complex communication network between your digestive system and your brain that controls satiety, mood, and metaboli… ▸ Do you guys eat 100% clean all the time — what does the research actually say for those with hypothyroidism or Hashimoto’s? ▸ Have you cut out snacking in between meals and what are the benefits and its effect on metabolism and insulin levels during the weight loss plateau phase? ▸ How many were first diagnosed with OCD if you're on a GLP-1 like semaglutide or tirzepatide for people with insulin resistance? 📖 One Box Protocol — A revolutionary approach where we stretch one 60 mg box of tirzepatide across three metabolic phases, prioritizing long-… ▸ Has anybody heard of or experienced improvement from neurological disorders through fasting and autophagy if you're on a GLP-1 like semaglutide or tirzepatide: best practices and common mistakes to avoid? ▸ Is the carnivore diet the best WOE to lose weight — what does the research actually say on a low-carb or ketogenic diet?