Synthetic food coloring is made from aniline dye isolated from coal tar as raw material, so it is also called coal tar coloring or aniline coloring, such as synthetic amaranth, carmine, and lemon yellow, etc. Occasionally add a certain amount of artificial Foods that synthesize food coloring do not cause poisoning, diarrhea, etc. Therefore, people can rest assured that foods with a small amount of artificially synthesized colors are practically added. Which of the following, if true, would most weaken the argument? ['Consuming foods with a small amount of synthetic food coloring is not good for human health.', 'Regular and occasional consumption have different effects on the human body.', 'Aniline dye contains harmful substances to the human body.', 'Foods added with a small amount of natural food coloring will not affect human health.']