Discuss the toxic constituents in foods. Add a note on recent trends and challenges in food adulteration.

1. 1 · Open in two lines. Toxic constituents are harmful substances in food: natural toxicants, or toxic adulterants added on purpose. Newer, smarter adulteration makes them harder to catch.
2. 2 · Natural toxicants. [Table: toxicant | food | effect | how to reduce: BOAA, aflatoxin, goitrogens, trypsin inhibitors, solanine, lectins, cyanogenic glycosides]
3. 3 · Toxic adulterants.
   • Argemone oil → epidemic dropsy.
   • Metanil yellow, Sudan dyes, malachite green → non-permitted colours.
   • Lead chromate → lead poisoning.
   • Calcium carbide → banned fruit ripener.
4. 4 · Recent trends. Economically motivated adulteration, synthetic milk, sugar syrups in honey, chemical ripening, false 'pure' or 'organic' claims, loose and online sales.
5. 5 · New detection and awareness. Rapid kits, Food Safety on Wheels, chromatography, NMR and DNA tests; the DART booklet and Eat Right India.
6. 6 · Challenges. Unorganised sector, too few officers and labs, adulterants designed to escape tests, low awareness, weak traceability.
7. 7 · Application in a diet plan. Dietitians advise against khesari dal as a staple, discarding mouldy nuts and using iodised salt; canteens buy from licensed suppliers.
8. 8 · Close in one line. Safer food needs alert consumers, modern labs and firm enforcement working together.

Scoring tip: Two neat tables (natural toxicants and toxic adulterants) earn most of the marks; finish with three trends and three challenges.