Does Skipping Breakfast Count As Intermittent Fasting?

Intermittent fasting is a trending nutrition strategy—but many women unknowingly compromise their hormonal health by skipping breakfast. In this episode, Lisa explores how breakfast impacts ovulation, energy levels, progesterone production, and overall cycle health. Drawing on research highlighted in Real Food for Fertility, she discusses why a strategic eating window—with sufficient calories and macronutrients—is critical for fertility optimization, especially for active women or those TTC.

Timestamps

• 00:00 – Chart interpretation struggles & the real reason you’re undernourished
• 04:30 – Study overview: breakfast, energy intake & physical activity
• 10:15 – Skipping breakfast = accidental under-eating?
• 15:45 – Macronutrient losses: lower protein and carbs in breakfast skippers
• 20:30 – How meal timing affects cycle length, mucus & luteal phase health
• 25:00 – Intermittent fasting done right: Lisa’s clinical recommendations
• 30:45 – Coffee, hunger suppression, and menstrual cycle disruption

Key Takeaways

• Skipping breakfast often leads to a 20–25% drop in total daily caloric intake—without compensatory eating later in the day.
• Women who skip breakfast tend to consume significantly less protein and carbohydrates overall, impacting hormone production.
• Under-eating—even unintentionally—reduces estrogen and progesterone levels, disrupting ovulation and the luteal phase.
• Strategic intermittent fasting can be cycle-safe when using a 10-hour eating window with three complete meals.
• Fertility-focused nutrition must consider macronutrient adequacy, timing, and the body’s physiological needs—not trends.

Resources and Mentions

• Skipping breakfast reduces energy intake and physical activity in healthy women who are habitual breakfast eaters- A randomized crossover trial.
• Real Food for Fertility | Lisa Hendrickson-Jack and Lily Nichols
• The Fifth Vital Sign: Master Your Cycles & Optimize Your Fertility (Book) | Lisa Hendrickson-Jack
• Fertility Awareness Mastery Charting Workbook
• Fertility Awareness Mastery Online Self-Study Program

Related Podcast Episodes

• [FAMM Practitioner Series] FFP 481 | Exercise, Undereating & The Menstrual Cycle | Haley Smith
• FFP 459 | Exercise, Under-Eating & Your Hormones | FAMM Research Series | Lisa | Fertility Friday
• FFP 370 | Eat More, Exercise Less, and Loose Weight? | A Women-Centred Approach To Weight Loss | Kitty Blomfield

Disclaimer

This podcast episode is provided for educational purposes only and is not intended as medical advice. Always consult a qualified healthcare professional with questions regarding your health or treatment.

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Lisa Hendrickson is a certified fertility awareness educator and holistic reproductive health practitioner with over 20 years of experience. As the host of the Fertility Friday Podcast and author of The Fifth Vital Sign, Lisa helps women and practitioners understand the menstrual cycle as a powerful diagnostic tool for fertility, hormone health, and overall well-being.