Here’s a frustrating truth many dieters know: the longer you cut calories, the harder weight loss becomes. This is called metabolic adaptation — when your body senses a calorie deficit and lowers energy expenditure to conserve fuel.

In a study on contestants from The Biggest Loser (Obesity, 2016), researchers found that participants’ metabolisms slowed dramatically after weight loss — some burned 500 fewer calories per day than expected, even years later. This explains why yo-yo dieting is so common: your body fights back against prolonged calorie restriction.

So what’s the alternative? Instead of constant restriction, intermittent fasting introduces cycles of eating and fasting.This rhythm gives your body recovery periods and reduces the pressure of long-term deficits. Some research (e.g., Annual Review of Nutrition, 2017) suggests that fasting patterns may protect metabolism better than continuous calorie cutting.

With Fastry, you’re not constantly eating less — you’re eating differently. That distinction matters for long-term success. It turns calorie consciousness into a lifestyle, not a punishment.