It will depend on a few different factors, such as what stage of change your client is in. If they are ready to make a change, then here are a few strategies:
1. Setting small but attainable goals is important for success. Having the client be accountable for things such as recording daily food intake or even showing up for an exercise session could be a good start.
2. A supportive environment from family and friends plays a big role in success and helps motivation.
3. Have a plan in place to overcome barriers to eating well or exercising. Examples are to plan healthy, low-fat meals ahead of time and have clothes ready to go for the gym.
4. Guidelines for proper nutrition, as well as a set exercise program that includes both cardio and strength training will help clients achieve goals of fat loss.
Hope this helps.