Nurses' health has been the subject of much discussion in reference to obesity and smoking. The effect of nursing on nurses' physical and mental health has also been a subject of a number of research papers where the effect of shift work or working with chemicals such as in chemotherapy has been explored.[46][47][48][49][50] In 2016 the government announced £600 million was to be spent on "tackling obesity and improving the well-being of its 1.3 million staff".