In the 1970s, when concern about the link between saturated fats (like butter, lard, tallow) and heart diseases started growing, experts suggested a shift to unsaturated fats, which are in the liquid form. But the food-processing industry needed semisolids, for products like cakes and biscuits, for which they partially hydrogenated oil. Hydrogenation is the addition of hydrogen atoms to break oil
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/making-trans-fats
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/down-earth
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/food-policy
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/food-standards
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/food-standard-authority
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/edible-oils
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health-effects
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/heart-diseases
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/cse-study
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/india