Mehak Agarwal, now 13, was banned from having milk when she was 8. Her friends found it strange, their parents found it bewildering. “When other parents were purging soft drinks from their homes, I was getting rid of milk and plastics,” says her mum, dermatologist Shehla Agarwal.   What made milk taboo in the Agarwal home were the hormones lacing it, among them oxytocin given to cows and buffaloes to make […]