Currently employees are subject to financial penalties if they do not have regular health checks or enroll in programs to help them better manage their weight. Despite increased desire to maintain employee privacy, courts have ruled that companies should have increased power to regulate their workers' health. Recently, a case in Wisconsin involving the company Flambleau Inc. looked at whether the company was allowed force its employees to complete a health questionnaire and have their blood pressure and weight checked just to qualify for their healthcare program. The judge ruled in favor of Flambleau.
See "Employee Wellness Programs Use Carrots and, Increasingly, Sticks", Reed Abelson, The New York Times, January 25, 2016