Summary of public health guidelines and associated evidence-base relating to physical activity, diet and sleep. Key references include \citealp{Kromhout_2016,Aune_2017,Mujcic_2016,Firth_2019,O_Keefe_2014,Plunk_2013,Cao_2015,Wen_2011,Chekroud2018,Watson_2015,MILNER_2009,Duggan_2016}