Weight loss and weight maintenance are not rocket science. Anyone who says that either is rocket science, or tries to make it complicated, is trying to make a buck or two out of your pocket.
Here is the equation for weight loss:
-Move more. Eat less. Make sure to focus on whole foods and minimally processed foods that fill you up and keep your "calorie budget" balanced. Just like your check book. Don't know what your calorie budget is? Check it out at Spark People.
Here is the equation for weight maintenance: Don't become complacent. Stay within your "calorie budget" by moving the right amount and eating for energy and nourishment.
Neither one is easy.
But the important stuff never is.