However, there is substantial evidence that pregnancy cravings serve a social function, rather than a nutritional one. Because popular pregnancy cravings differ in their nutritional make-up from culture to culture, it can be inferred that there is no set of nutritional needs that these cravings are filling. Instead, it may be that strange cravings help pregnant women signal their pregnant status and recruit help from others. Some decent evidence for this is the fact that women often crave obscure foods and reject commonplace ones. Providing pregnant relations with food may have been common among the human ancestor Homo erectus, which provides a possible explanation for the evolution of this behaviour. One of the treatments for morning sickness consists of accommodating food cravings and aversions. Depending from the historical period and the culture there are different traditions regarding pregnancy cravings. Some examples are: During pregnancy, Hmong women would follow their food cravings to guarantee that their child would not be born with a deformity. In Malta, a pregnant woman is encouraged to satisfy her cravings for specific foods, out of fear that her unborn child will bear a representational birthmark (Maltese: xewqa, literally "desire" or "craving"). In the Babylonian Talmud, folio 82a of Tractate Yoma mentions pregnancy cravings for non-kosher food (the passage discusses a pregnant woman who craves pork on Yom Kippur) as the paradigmatic example of a presumed life-threatening situation where a person is allowed to eat non-kosher food (and is permitted to eat it on Yom Kippur). In the Philippines, the condition is traditionally known as lihi, and it is believed that traits of a food that a pregnant woman craves and consumes is imparted to the child. This also extends to objects or people that a woman would find pleasurable to see during her pregnancy. In Thailand, a woman who starts craving sour foods after her period has stopped is deemed to be pregnant. Chocolate craving Chocolate is seen as a sweet that is desired more by women than by men. Studies conducted in the UK and US and Canada have concluded that women indeed crave chocolate more than men. Also this chocolate craving seems to occur more perimenstrual. However a biological explanation has not been scientifically proven. It seems to have a cultural cause instead of a biological cause. Spanish women experience perimenstrual chocolate craving far less than American women (24% versus 60%) although they should