The fastest way to lose weight is through nutritional advice and prescribed exercise. Often the term diet is used, this is a term I don't like as it sounds very restrictive. With the correct nutritional intake nothing needs to be cut out, only modified.
A nutritional consultation covers the following areas:
Daily intake analysis
Calorific requirements
Nutritional value of food
Hydration
Basal Metabolic Rate (daily calories expended)v
Ratios (carbohydrate / protein / fat)
Food myths
Healthy eating
Menu modification (healthy alternatives when eating out)v
A forward thinking individual plan