If you only eat whole foods, nothing prepared, nothing in a box or a tin or a cup, you will have complete control over what foods you consume. Go a few steps further, become a vegan, and you don't need to worry about what animal they are trying to pawn off on you, or what that animal has been eating.
The rising cost of food around the world may force some meat eaters to consume insects for protein. This is yet another problem avoided by vegans.