Change your exercise routine. If you've been sticking with your regular exercise routine each week, your body may have adapted to the energy output and won't necessarily shift into weight-loss mode. An easy way to overcome this is to modify your routine so you're either trying an entirely new exercise or increasing the intensity of your existing one. The goal is to "surprise" your body with some new movements that challenge new muscle groups or require you to workout harder. The result will be a stronger calorie burn, which can then help you start losing weight again.

Modify your diet. One of the biggest mistakes most dieters make is eating the same low-calorie diet day after day, week after week. It's likely that your body has simply adapted to your eating schedule, so it may be time to change things up and add some different foods to your plate. Consider adding more protein, trying new vegetables or cutting back on carbs and starches for a few days to jumpstart your metabolism. This is a simple strategy for resetting your metabolism, but it won't take long for the changes to take effect.