We the People of the United States, in Order to form a more perfect Union, establish Justice, insure domestic Tranquility, provide for the common defence, promote the general Welfare, and secure the Blessings of Liberty to ourselves and our Posterity, do ordain and establish this Constitution for the United States of America.
I think any one of the bolded items could be reasonably interpreted to include “make sure kids have food”. You are of course free to disagree but that seems pretty disingenuous to me.