Question

why hydrogenated vegetable fats are not advised to be used in preparation of food stuff

Answer 1

The problem with partially hydrogenated oils is that they contain trans fat, which raises LDL (“bad”) cholesterol, lowers HDL (“good”) cholesterol and has other harmful effects. In contrast, fully hydrogenated oils, in essence, become saturated fats—but they contain no trans fat

Answer 2

hydrogen is used for preparation of solid Vanaspati ghee for liquid vegetable fats like groundnut oil coconut oil at Sector this process is known as catalytic hydrogenation of oil because it takes place in the presence of finely divided Nickel or Platinum acting as a catalyst this process occurs at high pressure at and at the temperature of about 200 degree Celsius