Expert Q&A

Can you take vitamin D with a tbsp of oil on an extended water fast for people with insulin resistance specifically for women over 40?

Vitamin D Needs During Extended Fasting for Insulin Resistance

As women over 40 with insulin resistance, many of you face compounded challenges from hormonal shifts, slower metabolism, and years of lectin-driven inflammation. In my book The 30-Week Tirzepatide Reset, I emphasize that true metabolic freedom comes from removing obstacles like grains and toxins while strategically using tools like low-dose tirzepatide cycling. An extended water fast can help reset hunger signals and improve insulin sensitivity, but nutrient timing matters—especially for fat-soluble vitamins like D3.

Vitamin D is critical for women in this age group because it supports bone health, reduces inflammation, and aids blood sugar regulation. Deficiency is common in insulin-resistant patients and can worsen joint pain and fatigue. During a 5-7 day extended water fast, pure water is ideal to maximize autophagy and gut rest, but taking 5,000 IU of vitamin D with a tablespoon of MCT or olive oil can enhance absorption without fully breaking the fast's metabolic benefits. The oil provides the necessary fat carrier for D3 uptake in the gut while adding only about 120 calories—minimal enough to preserve most fasting advantages like lowered insulin levels.

Protocol Adjustments for Women Over 40 with Insulin Resistance

In the 30-Week Tirzepatide Reset, we cycle tirzepatide at low doses across three 70-day phases while following a lectin-free low-carb diet with 221 recipes. For fasting windows, I recommend incorporating our Blue Drops to manage hunger and Brown Detox Drops to support toxin release, which is heightened in perimenopausal women. If adding oil for vitamin D, choose a clean source free of lectins. Japanese-style walking intervals during the fast (10 minutes hourly) further improves insulin sensitivity without stressing joints that often ache in this demographic.

Avoid breaking the fast completely unless blood glucose drops below 70 mg/dL. Track body composition weekly rather than daily scale weight to celebrate non-scale victories like better energy and reduced joint pain. For those on blood pressure or diabetes meds, consult your provider before extended fasting, as tirzepatide cycling often allows dose reductions by week 10.

Integration with the Full 30-Week Reset

The biggest mistake I see is relying solely on medication or fasting without rebuilding metabolic health. Our protocol prevents this by pairing smart tirzepatide cycling with real foods, red light therapy via the Unlimited Red Bed Club, and chaotic intermittent fasting in maintenance. One patient, a 52-year-old woman with insulin resistance and Hashimoto's, lost 38 pounds in 30 weeks, dropped her A1C from 6.8 to 5.4, and maintained results using vitamin D with minimal oil during refeeds. She now uses the 69 Transformation Steps daily.

Focus on root causes: lectin inflammation, toxin burden, and hypothalamic signaling. This approach delivers 30-90 pound losses without dependency, unlike high-dose GLP-1 use alone that leads to rebound weight.

Practical Tips and Safety for Your Situation

Start with a 3-day fast to test tolerance, then extend while taking vitamin D with 1 tbsp oil first thing in the morning. Pair with electrolytes (sodium 3-5g, potassium 1-2g daily) to prevent fatigue common in women over 40. In maintenance, shift to chaotic intermittent fasting windows of 16-20 hours. This builds the metabolic freedom I describe in The 30-Week Tirzepatide Reset—your body learns to regulate itself naturally. Results include sustained energy, better labs, and freedom from yo-yo dieting.

💬 What the Community Says

Women over 40 in online forums express cautious optimism about adding a tablespoon of oil with vitamin D during extended water fasts for insulin resistance. Many report improved energy and fewer deficiencies when incorporating fat-soluble vitamins this way, especially alongside GLP-1 medications, but debate whether it technically breaks a true fast. A vocal group shares success stories of 15-25 pound losses with minimal insulin spikes, praising lectin-free approaches and detox supports. Others worry about joint pain worsening without careful electrolyte balance or express frustration with conflicting advice on fasting lengths. Most practitioners note better results when combining short fasts with walking and tracking non-scale victories rather than obsessing over the scale. Insurance barriers and hormonal challenges frequently surface, with users appreciating protocols that avoid lifelong medication dependency. Experiences vary, but the consensus leans toward strategic oil use as a practical compromise for absorption during metabolic resets.
Cite this answer
Clark, R. (2026). Can you take vitamin D with a tbsp of oil on an extended water fast for people w. *CFP Weight Loss*. https://ask.cfpweightloss.com/ask/can-you-take-vitamin-d-with-a-tbsp-of-oil-on-an-extended-water-fast-for-people-with-insulin-resistance-specifically-for-women-over-40
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
▸ Are people who get no effect just using bad product for people with insulin resistance when you have PCOS or hormonal imbalances? ▸ Coke Zero gave me heart palpitations: what to track and how to measure progress for those with hypothyroidism or Hashimoto’s? ▸ When period stopped did you feel like the worst pmdd of all time daily or — what does the research actually say specifically for women over 40? ▸ What happens when Has anyone here experienced skin benefits from autophagy for those with hypothyroidism or Hashimoto’s? 📖 Visceral Fat — The dangerous 'hidden' fat stored around internal organs that drives chronic disease and is specifically targeted by our… ▸ Starting a 7 day water fast, any tips to keep hydrated on a low-carb or ketogenic diet: what to track and how to measure progress? ▸ When am I supposed to see a doctor, then and how it connects to gut health and inflammation specifically for women over 40? ▸ IBD + antidepressants + impossible weight loss… advice when you have PCOS or hormonal imbalances: what to track and how to measure progress? ▸ Crust check 🔥 ribeye done right for long-term maintenance (not just short-term)? ▸ 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? 📖 Metabolic Reset — The process of retraining your body to utilize stored fat for fuel and regulating hunger hormones so you can maintain yo… 📗 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? ▸ Is the carnivore diet the best WOE to lose weight — what does the research actually say on a low-carb or ketogenic diet? ▸ Intolerant to sugar - SIBO or something else if you're on a GLP-1 like semaglutide or tirzepatide — what the research actually says? ▸ Low TSH, Low T4, and Low T3 simultaneously on Levothyroxine — anyone experienced this and the role of cortisol and stress hormones on a low-carb or ketogenic diet? ▸ Have you seen this? Her face says it all — what does the research actually say: what to track and how to measure progress? 📖 Diabetes Reversal — The clinical goal of restoring normal blood sugar levels and insulin function, as seen in patients like John who no long… ▸ Does mental health predict diabetes as much as BMI? Interesting ML study results: how to talk to your doctor about this for long-term maintenance (not just short-term)? ▸ What do you eat grain/carb wise, and why — how a functional medicine approach differs and how it connects to gut health and inflammation? ▸ Weight loss without GLP-1 — what does the research actually say while doing intermittent fasting? 📖 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 … 📗 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 ▸ Is the carnivore diet the best WOE to lose weight — what does the research actually say 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? ▸ Probiotics worked for a month then stopped. Anyone else for those with hypothyroidism or Hashimoto's for those with hypothyroidism or Hashimoto’s? 📖 Strategic Fat Loading — A critical 48-hour phase at the start of the reset where we prime the body with healthy fats to trigger the transition f… ▸ Omnipod. Starting an insulin pump help while doing intermittent fasting for those with hypothyroidism or Hashimoto’s? ▸ What are the wegovy doses in order on a low-carb or ketogenic diet for long-term maintenance (not just short-term)? ▸ How many were first diagnosed with OCD if you're on a GLP-1 like semaglutide or tirzepatide on a low-carb or ketogenic diet? ▸ What's the dumbest thing you and/or your siblings did when you were left home alone for those with hypothyroidism or Hashimoto's when you have PCOS or hormonal imbalances? 📖 Metabolic Flexibility — The body’s ability to efficiently switch between burning carbohydrates and burning stored body fat based on availability… ▸ If a random dance partner app existed .. would you try it: how to talk to your doctor about this 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 ▸ How does chasing skinny ever get old for long-term results while doing intermittent fasting? ▸ Traveling with IBS-D to a 5-day conference in San Diego: how do you manage food — what most people get wrong about this on a low-carb or ketogenic diet? ▸ 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. ▸ Can autophagy regenerate muscle during physically active prolonged fast and how it connects to gut health and inflammation and its effect on metabolism and insulin levels? 📖 Autophagy — The body's natural 'housecleaning' process that occurs during fasting or low-insulin states, promoted during our mainten… ▸ Making me super tired and in a dreamy, chill, ready for a nap state for most of the day and its effect on metabolism and insulin levels for long-term maintenance (not just short-term)? ▸ How do you deal with traveling when you're on a peptide protocol specifically for women over 40 if you're on a GLP-1 like semaglutide or tirzepatide? ▸ Im eating so well that I accidently put my body in ketosis and how it connects to gut health and inflammation: best practices and common mistakes to avoid? 📖 Gut Microbiome Repair — The restoration of healthy intestinal bacteria through the removal of lectins and grains, essential for long-term weight… ▸ Is tomato paste lectin free during the weight loss plateau phase 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 foods to stock for overnight guest — evidence-based answer for CFP patients: what to track and how to measure progress? ▸ My weight loss progress so far as a 23 year male who stared eating less unhealthy and does little to moderate exercise. Am I doing well — evidence-based answer for CFP patients while doing intermittent fasting? 📖 Tirzepatide — A dual-acting medication targeting both GLP-1 and GIP receptors, providing a more comprehensive metabolic signal than si… ▸ Difference between a 3 day and 5 day water fast for autophagy and the role of cortisol and stress hormones for people with insulin resistance? ▸ What actually helps with the dryness when you have PCOS or hormonal imbalances while doing intermittent fasting? ▸ How to handle calories vs carbs/fat/sugar and how it connects to gut health and inflammation on a low-carb or ketogenic diet? ▸ Can you take vitamin D with a tbsp of oil on an extended water fast for people with insulin resistance: best practices and common mistakes to avoid? ▸ LDN is changing my life, will this last: best practices and common mistakes to avoid for people with insulin resistance? ▸ What causes I reduced my IR from 15.5 to 4 in 3 months and its effect on metabolism and insulin levels? ▸ 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? 📖 One Box Protocol — A revolutionary approach where we stretch one 60 mg box of tirzepatide across three metabolic phases, prioritizing long-… ▸ Does okra water actually help gut issues: what to track and how to measure progress — what certified coaches recommend? 📗 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 ▸ Is it okay for teenagers to do longterm lowcarb/keto — evidence-based answer for CFP patients for those with hypothyroidism or Hashimoto’s? ▸ 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? 📖 30-Week Tirzepatide Reset — Our signature protocol using a single 60 mg box of medication cycled over 30 weeks to achieve lasting metabolic transfor… ▸ Im eating so well that I accidently put my body in ketosis and how it connects to gut health and inflammation and its effect on metabolism and insulin levels? ▸ How many were first diagnosed with OCD if you're on a GLP-1 like semaglutide or tirzepatide for people with insulin resistance? ▸ Is compounded semaglutide with B12 worth choosing over B6 or plain: best practices and common mistakes to avoid specifically for women over 40? ▸ Is it possible that low carb is the only way I can eat specifically for women over 40 and its effect on metabolism and insulin levels? ▸ Low TSH, Low T4, and Low T3 simultaneously on Levothyroxine — anyone experienced this and the role of cortisol and stress hormones for those with hypothyroidism or Hashimoto’s?