Intermittent fasting (IF) has been one of the most talked-about dietary approaches of the last decade. But beyond the hype, what does the research actually show?
What Is Intermittent Fasting?
IF is an eating pattern that cycles between periods of fasting and eating. It doesn't dictate what you eat — it focuses on when you eat.
Common protocols:
- 16:8 — Fast for 16 hours, eat within an 8-hour window (e.g., 12pm–8pm)
- 5:2 — Eat normally 5 days, restrict calories (~500) on 2 non-consecutive days
- OMAD — One meal a day (advanced, not recommended for beginners)
What the Science Says
Multiple meta-analyses confirm IF can lead to weight loss — but mostly because it reduces overall calorie intake, not because of any metabolic magic. When calories are matched, IF performs similarly to continuous calorie restriction.
Studies have also looked at markers such as insulin and blood sugar. In a year-long randomised trial published in the New England Journal of Medicine (Liu et al., 2022), time-restricted eating combined with calorie restriction did not lead to more weight loss or larger changes in these markers than calorie restriction alone.
Is It Right for You?
IF works well for people who aren't hungry in the morning and find it easier to skip breakfast than to eat less at every meal. It's not ideal for athletes with high training volumes, people with a history of disordered eating, or those on medications requiring food.
Tracking IF With Pacali
Use Pacali's fasting timer to track your fasting window, and log meals in the eating window to check you're meeting your protein target and not compensating with low-quality foods.
