Expert Q&A

Lost 3 and a half kg in my first 3 days…is this normal while doing intermittent fasting for long-term maintenance (not just short-term)?

Understanding Your Rapid Initial Loss

Losing 3.5 kg in the first three days while starting intermittent fasting is completely normal, especially when combined with the principles in my book The 30-Week Tirzepatide Reset. This early drop is rarely fat; it's primarily water, glycogen, and some intestinal waste. When you shift to a low-carb, lectin-free diet and introduce intermittent fasting, your body depletes stored carbohydrates that bind water—about 3–4 grams of water per gram of glycogen. Add reduced inflammation from removing grains and processed foods, and the scale moves fast. In our Nashville clinic, new patients routinely see 2–5 kg in the first week. The key question is whether this sets up intermittent fasting for long-term maintenance rather than another yo-yo cycle.

Why Most Rapid Loss Fades Without the Right Protocol

The two biggest mistakes I see are relying solely on intermittent fasting or medication without rebuilding metabolic health, and ignoring non-scale victories. Quick water loss feels exciting but often leads to frustration when the scale slows. True success comes from addressing insulin resistance, toxin burden, and broken hunger signals. Our 30-week protocol uses three 70-day cycles with low-dose tirzepatide cycling, targeted supplements like Brown Detox Drops, and Japanese-style walking intervals. This prevents rebound by restoring hypothalamic function and hormonal balance so your body naturally defends a lower weight.

Building Intermittent Fasting for Long-Term Maintenance

For lasting results, transition from early aggressive intermittent fasting to "chaotic intermittent fasting" in maintenance—varying your eating windows daily so your metabolism never adapts. Combine this with our exact 221 lectin-free recipes, red light therapy sessions, and the 69 Transformation Steps outlined in The 30-Week Tirzepatide Reset. Track body composition, not just scale weight. Aim for 0.5–1 kg of true fat loss per week after the initial drop. Patients who follow this see sustained energy, better blood pressure, improved A1C, and joint relief—critical for those 45–54 managing diabetes alongside weight.

Practical Next Steps to Protect Your Results

Continue your current intermittent fasting window but prioritize protein and healthy fats in your meals to preserve muscle. Stay hydrated, use our Blue Drops if hunger spikes, and incorporate 20–30 minutes of daily walking. By week four, reassess with weekly averages rather than daily weigh-ins. This approach has helped hundreds lose 14–40 kg and maintain it naturally. Remember, sustainable weight loss isn't about willpower—it's about metabolic freedom. You can use tools strategically while building habits that last long after any medication or fasting phase ends.

💬 What the Community Says

The community shows mixed but mostly positive reactions to rapid 3.5 kg drops in the first few days of intermittent fasting. Many in the 45-54 age group report similar early water-weight losses of 2-5 kg when starting low-carb or lectin-free plans alongside tirzepatide, describing it as motivating yet worrying when progress slows after week one. A vocal minority debates whether such quick results signal unsustainable tactics or smart metabolic resets, with several sharing stories of regain after stopping intermittent fasting without lifestyle changes. Most practitioners in forums praise combining chaotic intermittent fasting with walking and detox support for maintenance, noting improved energy and joint comfort. Insurance concerns and past diet failures surface frequently, but users following structured 30-week style protocols seem encouraged by non-scale victories like better labs and clothing fit. Overall sentiment leans toward cautious optimism that initial rapid loss can lead to long-term success if paired with real-food habits rather than medication alone.
Cite this answer
Clark, R. (2026). Lost 3 and a half kg in my first 3 days…is this normal while doing intermittent . *CFP Weight Loss*. https://ask.cfpweightloss.com/ask/lost-3-and-a-half-kg-in-my-first-3-days-is-this-normal-while-doing-intermittent-fasting-for-long-term-maintenance-not-just-short-term
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.

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