There is a general perception that almost no one succeeds in long-term maintenance of weight loss. However, research has shown that ≈20% of overweight individuals are successful at long-term weight loss when defined as losing at least 10% of initial body weight and maintaining the loss for at least 1 year.
…The single best predictor of risk of regain was how long participants had successfully maintained their weight loss. Individuals who had kept their weight off for 2 years or more had markedly increased odds of continuing to maintain their weight over the following year. This finding is encouraging because it suggests that, if individuals can succeed at maintaining their weight loss for 2 years, they can reduce their risk of subsequent regain by nearly 50%.
It’s about maintaining your changed lifestyle. If you did it by dieting you always have to diet; if you workout a lot you just need to keep working out.