It depends on the individual, as the effectiveness of behavioural psychology for weight loss will vary from person to person. However, there are some general principles of behavioural psychology that may be useful for weight loss. One key principle is behaviour modification. This involves changing your behaviour patterns in order to achieve your weight loss goals. For example, if you tend to snack on unhealthy foods between meals, try replacing those snacks with healthy alternatives, like fruit or vegetables. Seeing a behavioural psychologist can help you to identify and change any unhealthy behaviours that may sabotage your weight loss efforts,