Most nonsurgical weight loss programs are based on a combination of diet, behavior modification and regular exercise. Unfortunately, even the most effective interventions don't work for everyone. It's estimated that less than 5 percent of individuals who participate in nonsurgical weight loss programs will lose a significant amount of weight and maintain that loss for an extended period of time.
I have helped numerous clients succeed in significant weight loss journeys that involve losses of over 20-30 kg in body fat over the space of 1-2 years or more. I actually find such longer term journeys more rewarding as they allow me to teach my clients about the impact of nutrition and lifestyle habits on their physiology. This not only helps them, but also helps those closest to them as well.