An example of a person who might be described as sedulous about his health is someone who continually and carefully monitors what he eats and how much he exercises.
Sedulous attention to the task.
2001 Pollan, Michael, The Botany of Desire, Random House, New York, page 135.
With the right equipment, an indoor grower could create a utopia for his plants, an artificial habitat more perfect than any in nature, [...]. These sedulous attentions would be wasted on male plants, which are worse than useless in sinsemilla production.
2010 Paul Routledge, Daily Mirror, 9 March 2010 .