When it comes to weight loss, you know just about everything you’re supposed to remove from your life — processed foods, a couch potato habit, soda. But losing weight doesn’t have to solely be about subtraction. In fact, the most successful weight-loss plans work well because they include additions like healthy foods, positive thoughts and more.

You worked hard to shed pounds, but then it crept right back. It happens. In fact, about 80% of people who lose weight regain it all or more, according to some estimates. It’s a term known by industry experts as ‘weight cycling’ — and colloquially as yo-yo dieting. Here, a look at what this yo-yoing means, why it occurs and smart strategies to keep the weight off for good.