Research shows that people can under report their food intake by up to 50%. So instead of consuming 2,000 calories a person might be consuming 3,000. This may be the cause of your dreaded plateau in your weight loss program.
Begin tracking your food by writing down everything you eat, portions, and calories. At the end of the day see how many calories you have consumed. This is a great place to start to see if you may be taking in more calories than you are expending.