If you have tried to lose weight at one time or another, you have probably been told or have read somewhere that to get rid of excess weight, you need to burn more calories than you take in. The logic is simple and sensible, however it can also lead to believe one of the most common weight-loss misconceptions which is: The less you eat, the more you lose. 
To a certain degree, this is true if you consume more calories than you need to maintain your weight, then you would certainly gain weight. However, if you dramatically lower your caloric intake all of a sudden, your body will switch to survival mode thinking that you are starving and will cling to your stored fats. Thus, you may actually be sabotaging your weight loss efforts if you starve yourself.
A healthy diet should only go down to only 1,200 calories a day and not any less although every individual dieter needs to determine the “magic number” that works for them for optimum weight loss. According to research, when women take in less than the optimal amount, their metabolic rate at rest drastically drops by as much as 45 percent.
Experts say that it may be necessary to adjust your caloric intake a couple of times during the weight loss process particularly if you need to shed a large amount of weight to account for your changing metabolism, weight and activity.