This guide investigates the chemical composition and health implications of various natural and artificial additives commonly found in the modern food supply. John L. Clark provides a systematic overview of the substances used to preserve, color, and flavor processed foods, evaluating their safety profiles and potential physiological impacts. The text serves as a reference manual for consumers seeking to understand the ingredients listed on food packaging.

The subject matter points to a compact, utilitarian reference text designed for the general consumer interested in food safety. Its inclusion in the Collins Gem series suggests a focus on accessibility and brevity for quick field consultation.