Helping people lose weight is big business and all the main supermarkets have their own weight loss lines of varying qualities. M&S's new 'Fuller for Longer' range of sandwiches, salads and ready meals is one of the better ones.
The range is based on the idea that eating more protein with your meal will keep you fuller for longer. This is because protein is slower to digest than carbohydrates and so the stomach will empty more slowly after a higher protein meal. In addition the energy will be released more slowly avoiding the sudden blood sugar drop (and post lunch sleepiness) you can get after a high carb meal.
The good news is that you don't have to shop at M&S to benefit ... When purchasing pre-prepared food look on the label for food with as close to 1:1 protein to carbohydrate as possible. When preparing food yourself add an equal volume of carbohydrates and protein plus the same volume in non-starchy vegetables. This should keep you feeling fuller for longer and help avoid post-meal energy slumps.