Final regulations to implement ACA provisions, issued in 2013 by the US Department of Labor (DOL), said health-contingent wellness programs can vary group health plan premiums or cost sharing based on health status and will not be considered to discriminate based on health status if they meet five standards.
It's only a partial answer, but a Nile crocodile can eat up to half its body weight at a sitting, according to National Geographic. Since few freshwater fish weigh half as much as a crocodile, we can probably assume these croc feasts occur when they're able to ambush ungulates (e.g. zebras and antelope).
So how much does an adult crocodile actually eat? I think relevant other questions in this context are: Do all adult crocodiles (or even all crocodilia) eat roughly the same (corrected for body mass)? Some crocodiles apparantly eat fruit and seeds on a regular basis*, is this is a relevant part of their caloric intake or just a vitamin supplement?