Even if you follow the Weight Watchers program to the letter, you won't be effective at losing weight if you consume a more significant amount of calories than what your body requires daily. That is true even if you follow the program to the letter. When broken down into its parts, weight loss is a relatively simple process, despite the common misconception that it is a challenging endeavor. The fundamental reason why people struggle to lose weight or gain weight in the first place is that they consume more calories than their bodies need daily.