To identify studies regarding weight maintenance, with an emphasis on dietary interventions, a complete search of articles was carried out by using PubMed and SCOPUS. The studies were restricted to those in English. The key words included ‘overweight’, ‘obesity’, ‘weight maintenance’, ‘weight regain’, and ‘diet therapy’. Articles from 1974 to 2013 were included. We found 75 articles. We excluded studies published only as abstracts and those involving behavioral therapy or exercise per se. Finally we evaluated 26 studies.
LeCheminant and his colleagues used a liquid form of very low energy diet (VLED) for weight loss. Subsequently, they randomized participants to receive a structured meal plan combined with either two-meal replacements or orlistat and physical activity. There was no significant difference in weight change between the groups during weight maintenance.[3]

Don't become overwhelmed with the initial hype. Really consider whether you can maintain a plan and if it provides the tools and strategies you require for long-term success. Can you realistically eat this way for the rest of your life? Does the plan include other strategies – exercise, sleep, stress control, etc. – that complement long-term success? Once you've found the right plan, commit to it. What you put into it, you'll get back. Very best wishes as you begin your fat-loss journey. 
If you’ve been eating fast food for years, get real about your approach: You’re probably not going to stick to an organic, gluten-free, paleo overhaul for very long. “You want to change as little as possible to create calorie deficit,” says Dr. Seltzer, who insists the best way to support sustainable weight loss is to incorporate small changes into existing habits. So instead of giving up your daily BLT bagels in favor of an egg-white wrap, try ordering your sandwich on a lighter English muffin. Or say you eat a snack bar every afternoon: Swap your 300-calorie bar for a 150-calorie alternative. “Your brain will feel the same way about it, so you won’t feel deprived,” he says.