Some people will never get their money back.
The first category, the elderly, because they are old, lose appetite and have less daily activities, their calorie consumption will be reduced accordingly, their hunger will be reduced and their food intake will be reduced. Coupled with the deviation of their dietary preferences, they will be more picky about their diet, so their appetite will be reduced. Such physical conditions and eating habits will inevitably lead to such people not being able to get back their money, even the buffet.
The second category, women. Women will eat less and drink less because of physical reasons, beauty, slimming and image needs. This is true even for young women at the peak of metabolism. Of course, except for some special industries or occupations, such as athletes, women in other industries generally eat less.
The third category: children, children have picky eaters, and it is universal. Boys and girls are the same. Moreover, in addition to dishes and staple foods, the cafeteria generally has snacks that children especially like, such as cakes, puddings, ice cream, drinks and so on. Together, these two factors directly lead to children not getting their money back in the cafeteria.
The third category, men who travel together, are the main consumers of the canteen and should be able to eat the money back. However, these people usually go into binge drinking immediately after eating a little food in the cafeteria. Excessive alcohol will greatly suppress hunger, so these people will hardly eat their money.
Then, the answer to this question is obvious, and almost everyone can't eat it back.