The lowest dose found to have any effect in rats would be equivalent to eating ~5kg of uncooked flour per day, every day. I do not think many people eat anything remotely close to that amount of raw dough.
In isolation, sure. How many of these little doses of toxins from hundreds of food additives does it take before the diet as a whole is toxic enough to have an adverse effect? Is anyone even watching the combinations found in typical diets?