Are these packaged milks (Good Life, Nandini) safe for health?
All leading packaged milk brands in india are UHT (Ultra Heat Treatment) treated. UHT involves heating milk at a temperature of 135 degrees Celsius (which is above boiling point) for a few seconds and then cooling it down.
What happens when milk is heated at such a high temperature? It loses its nutritional value, taste and smell. True, micro-bacteria are killed in this process, but we should also be aware of the fact that not all bacteria are bad for us and this process also kills the good ones. Once going through the UHT process, the milk we buy has an artificial smell and taste added to it. What I don't know is whether additional nutrients are added to the milk or not. The process also involves homogenization, which ensures that milk and water are not separated (so curdling doesn't happen). In a nutshell, the milk provided to us is nothing but treated liquid sold as milk.
The milk is then packed between five to six layers of cardboard, polythene and aluminum sheets. This is done to preserve the milk for a longer period of time. The shelf life of milk in Tetra Pak is six to nine months and can be kept at room temperature without curdling. It doesn't curdle or get contaminated because it is kept away from light and bacteria.
However, this is not healthy. Tetra Pak packing has been found to release chemicals in to milk such as urea. And of course it is also simply not fresh.