The word 'Propensity' fits best in the sentence blank due to its meaning of a natural inclination. It conveys the patient's tendency towards unhealthy eating.
Propensity is the best fit for the sentence blank as it means a natural inclination towards a particular behavior. In this context, the patient's propensity for eating unhealthy foods led to the advice to restrict his caloric intake and exercise more.
Habit and disinclination are not as suitable as they do not convey the idea of a natural inclination towards unhealthy eating.
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