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Intermittent Fasting: Is It Worth It? Real Answers 2025

An analog clock on a plate, symbolizing IF is about when you eat and not what you eat

Intermittent Fasting (IF) is a different kind of dieting, focusing more on when you eat rather than what you eat or how much. The name comes from its nature – a pattern that cycles between periods of eating and not eating.

Over the last few years, IF has gone from niche to mainstream, with fans swearing by everything from the 16:8 method to alternate-day fasting. Some say it helped them shed stubborn pounds, while others praise its potential perks for energy, focus, and even longevity. 

But is intermittent fasting really that great? With the help of our in-house nutritionist, I cracked open the IF trend, and I’ll break everything down for you in this well-researched and comprehensive guide. So stay tuned until the end to learn everything there is about IF!

Quote from our certified nutritionist

What Is Intermittent Fasting, & How Does It Work?

Think of intermittent fasting as a time-based eating strategy, not a classical diet. Instead of obsessing over carbs or calories, IF focuses on when you eat rather than what you eat. You cycle between periods of eating and fasting, when you don’t eat anything or eat very little.

Unlike classic calorie restriction, where you're trimming portions all day, IF gives your body longer breaks from digestion, which some research suggests might have benefits beyond the scale1. It’s worth noting that many of these benefits of IF are mediated by the weight loss that often comes with IF.

Types of Intermittent Fasting

The good news is that there’s no one-size-fits-all when it comes to intermittent fasting. Different approaches suit different lifestyles, hunger cues, and goals. You can even design your own methods, but if you’re looking for inspiration, here are the most popular types: