The BEST Fasting Rules for Visceral Fat Loss (WAY BETTER Than 16:8!)

Summary

Dr. Mindy Pelz argues for “flexible fasting” rather than following the same daily eating schedule rigidly. She describes fasting as a tool for metabolic health, while emphasizing that people should adapt it to their needs instead of forcing themselves to follow one rule.

Pelz highlights a 12-week randomized trial involving 104 women aged 40–60. As she describes it, participants used a flexible eight-hour eating window—starting between 8 a.m. and noon and finishing between 4 p.m. and 8 p.m.—and did moderate aerobic exercise. The flexible-window group reportedly lost 6.6 pounds more than the comparison group, with 83–87% adherence. Pelz notes that she could not access all the details about the control group, so the comparison is not fully clear in the video.

Key Fasting Strategies

• Vary your eating window. Choose when to eat based on your schedule and appetite, and adjust the window from day to day. For example, eat before a morning workout and finish earlier, or start later to have dinner with family.
• Drink more than plain water during a fast, according to Pelz. She suggests water, mineral water, unsweetened tea, black coffee, and electrolytes or minerals. She says coffee may support autophagy and that minerals may help with dizziness.
• Distinguish shorter fasts from prolonged fasts. Pelz presents fasts under 24 hours as routine or “maintenance” tools, and fasts of 24–72 hours as occasional therapeutic tools—not something to do regularly. She advises people experiencing chronic stress not to exceed 24 hours.
• Treat hunger as information, not a test of willpower. She recommends adjusting the eating window if hunger is persistent, and suggests minerals, olive oil, or MCT oil in coffee as ways to manage hunger. The video does not discuss whether these affect a fast’s calorie-free status.
• Combine fasting with movement. Pelz says fasting should not replace exercise and points to moderate aerobic activity as part of the study’s approach. She also mentions strength training, creatine before a fasted workout, and protein in the post-workout meal as options.
• End a fast thoughtfully. She emphasizes that what and how you eat after fasting matters, and recommends protein with meals, along with fiber and fermented foods to support the gut microbiome.
• Don’t force a fast if you feel unwell. She says that if you feel shaky, dizzy, anxious, or agitated, you can use strategies to feel better or end the fast early. She cites a separate 2025 study as suggesting that ending a fast early when glucose falls below a personal threshold can still be compatible with weight and glucose improvements.
• Don’t assume fasting disrupts sex hormones. Pelz cites a study of pre- and postmenopausal women that found no significant changes in estrogen, progesterone, or testosterone with time-restricted eating. She says fasting should still be tailored to menstrual and life-stage needs, and reiterates her preference to avoid fasting during the week before a period.

Pelz’s Practical Checklist

1. Change your eating window as needed rather than following the same hours every day.
2. Replenish minerals during the fasting window.
3. Include protein with meals.
4. Include fiber and fermented foods during the eating period.
5. Pair fasting with moderate physical activity.

Presenters and Sources Mentioned

• Presenter: Dr. Mindy Pelz
• A November 2025 randomized controlled trial in Nature Communications involving 104 women aged 40–60.
• A 2016 meta-analysis on cortisol and prolonged fasting.
• A 2023 study in Obesity on time-restricted eating and sex hormones in pre- and postmenopausal women.
• A 2025 study involving more than 6,000 users on glucose thresholds and ending a fast early; the publication is not identified in the subtitles.
• Pelz’s book, Fast Like a Girl.
• Products or resources she mentions: Element, BEAM Minerals, Qualia creatine, and Reset Academy.