Fasting on a ketogenic diet — twelve lessons I’ve learned about what not to do and what to do for a successful fast. Curious how fatty coffees can fit into a fasting routine? Read on to learn how and why that can work, plus practical tips for fasting well.
People often ask me: how can drinking fatty coffee be considered fasting when you’re consuming calories? That’s a valid question. After years of experimenting with keto and intermittent fasting, I’ve learned strategies that clarify when certain beverages or small additions help or hinder your goals.
I’ve practiced fasting for about four years. As a woman with a history of hormone imbalances, I’ve adapted my approach to keep things safe and effective. Below I summarize key ideas and considerations that I use and share with others.
One discovery that changed how I use fasting was learning that bone broth can extend a fast in certain situations. Today I’ll explain why that works and when it can be useful. You can make your own bone broth or buy a quality product — many people choose the convenience of ready-made broth.
Below are practical, experience-based highlights and recommendations for intermittent fasting while following a ketogenic lifestyle. These notes are aimed at helping you decide which practices support metabolic health, weight management, and hormone balance.
Key Points and Strategies
- Two main fasting approaches exist: metabolic/insulin-focused fasting (minimal calories, emphasize low insulin) and adaptive or flexible fasting (small amounts of fat or broth to reduce hunger and support adherence). Your goals determine which path is better.
- For insulin regulation and weight loss, strict fasting that minimizes proteins and carbohydrates is most effective. Small amounts of pure fat may not raise insulin much, but they do provide energy and can slow autophagy and some cellular repair processes.
- Fatty coffees (bulletproof-style) can help people tolerate longer fasting windows by reducing hunger and providing mental clarity. However, they are not a true fast in the strict sense and may blunt some benefits like autophagy and longevity pathways.
- Bone broth is a middle ground: it supplies electrolytes, collagen, and a small amount of protein. In low quantities it can extend comfort during a fast and support electrolytes, but if you’re pursuing maximal cellular repair, even bone broth can interfere.
- Women, especially those with sensitive or fluctuating hormones, should monitor how fasting affects mood, energy, sleep, and menstrual cycles. Adjust fasting windows, frequency, and what you consume during fasts to prioritize hormonal balance.
- What to avoid before a fast: large carbohydrate meals that spike insulin, excessive caffeine late in the day, and heavy or inflammatory foods. These can disrupt sleep, increase hunger, or make fasting harder.
- When breaking a fast, choose nutrient-dense, minimally processed foods that are easy to digest: bone broth, soft-cooked vegetables, fermented foods, or a small meal with balanced fat, moderate protein, and low carbohydrates.
- Hydration and electrolytes are essential. Salt, magnesium, and potassium support energy and reduce headaches or dizziness. Bone broth, mineral water, or electrolyte blends without added sugar are useful.
- If your goal is longevity and slowing aging, minimize calorie-containing beverages during fasts. Water, herbal tea, and black coffee are the closest to a strict fast for those benefits.
- Track how different fasting styles affect your sleep, stress, and performance. If fasting increases cortisol or disrupts sleep, shorten the window or reduce frequency until you find a sustainable routine.
- Consistency and gradual changes matter more than extremes. Build up fasting windows over weeks, not days, and prioritize recovery, sleep, and nutrient-dense eating on feeding days.
- Use fasting as a tool, not a test of willpower. The best fasting plan is the one you can follow without harming your physical or mental health.
Mini Guide & Transcript
I offer a short downloadable PDF with a transcript of the video, practical resources, and step-by-step suggestions to improve fat-burning and fasting success. It’s a concise reference you can save and use whenever you need it.
To get the mini guide, provide your details through the offered form and the file will be delivered to your inbox.
Highlights
- The two fasting approaches and how they shape strategy
- Which fasting method best supports insulin regulation
- Why fatty coffee can undermine some longevity-focused benefits
- What to avoid eating immediately before and after a fast
Resources
- High-quality bone broth can be a convenient option for electrolyte support and collagen.
- Beginner-friendly videos and podcasts explain fasting basics and practical strategies for success.
- Recipes for satisfying, low-carb, high-fat beverages can help with adherence when you’re in a more flexible fasting approach.
- Bundles and guides are available for structured learning about ketogenic eating and fasting protocols.
I choose and recommend products based on ingredient quality, customer care, and integrity. The brands mentioned here are ones I trust, and my opinions remain independent.