Christians, Is eating processed food sinful? It's science?

God created us to be vegetarian and just eat the plants he created (except that one, ha, ha). Then permitted us to eat meat after the flood. Right? So I'm guessing he imparted us with the knowledge to cook meat and simple foods. But the processed food most of us eat today is pure science- and isn't it sinful to trust in science? Isn't that crappy casserole you make with canned soup and take to your ladies church group sinful?