Ughh ! answer me aspa?

ok me and my bff come to my house everyday after school bt heres the thing that bugs me my bff like eats all my food and then my mom yells at me and says stuff and like she eats everthing in this house blah bt what am i suppose to sayy dont eat my food cus i cant say that cus we go to her house i eat there bt i dont like eat like thousands pounds of food i have like a bag chips or something so what am suppose to say to her dont eat here bt i can eat ur house dont want to sound like a jerk so i need ideas for tell my bff to not eat all my food in my pantry so any suggestest that work