Our "food reward" system is powerful – and is largely behind why we crave unhealthy foods.
Women might find themselves reaching for sweets and potato chips in the two weeks before their period, even if they don't have a diagnosis of PMS. An OBGYN explains these cyclical food cravings.
Obese people don't have more frequent or intense food wanting episodes than lean people, but they do enjoy their food less.
Nutritional deficiencies are linked to food cravings in certain situations. In general, however, there is no real evidence to link our common food cravings with nutritional deficiencies.