Often our portion sizes are much larger than we need. You should serve meals using a smaller plate. If there is more food than needed, put it away for another meal. It’s much harder to have another serving if your leftovers have been portioned out for another meal.
Eat slowly. It takes some time for your body to register that you are full. If you eat quickly, you will eat too much food, and end up eating more calories than you need.
Don’t eat if you aren’t hungry and choose foods that keep you fuller for longer.
By drinking up to a litre of water before a meal, you will feel fuller and less likely to overeat.