why do girls eat so little on first dates???

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i've noticed this 'cause i've dated a lot of girls to find my perfect partner. i tried to be romantic,and find myself with my date in a good restaurant... well...most of them,in time of ordering food will say,whatever you order,i will have it too. i eat, a lot... i can finish what i have order but my date in majority that i have counted only eats not even half of what she ordered. a month ago,me and my girl couzin,went to mcdonalds well,she finished what she ordered. my girl friends,never like to eat a lot in a restaurant,they more prefer to wine and dine in my home. why is this so??? do girls are really like this??? my male friends also find it weird... girls,can we have the answer??? boys,what do you think about this issue???