Start at a level you can manage and build up your level of physical activity over time. Being physically active will help increase energy and reduce weight. As your weight is reduced it's easier and more fun to be active. Fish, skinned poultry and lean low fat meats. If you can't get by without a snack, try a piece of fresh fruit or a muesli bar.
Alcohol stimulates the storage of fat and is also high in calories.
Eat at least three well planned meals every day including breakfast. Drink plenty of water - 5 or more glasses daily. A low fat soup or salad at the beginning of a meal will fill you up. It takes time for your brain to recognise that your stomach is full. Eat slowly - don't rush your food.