All you really need to know is get the smallest available plan because there is no benefit of the larger ones. If you end up eating more than the smallest plan allows, you can very easily add money to your account. It is likely the standard plan will be enough, but even if you knew you would eat more than the standard plan, it still doesn’t make sense to get a bigger one.
The 60% “discount” on the meal plan that yourmomma mentioned is basically designed to deceive people. Essentially, the money you pay for the plan is converted into I-Bucks. 1 I-Buck is worth $2.50. So the $10 meal from the post above would cost 4 I-Bucks after the 60% “discount”. But in reality, the meal still costs $10 because I-Bucks are worth $2.50 each. They just show you the price in I-Bucks to essentially trick you into thinking you are paying less than the total cost, but in fact, you are paying the total cost.
This can get pretty confusing, so let me know if you have any other questions or if I should re-explain anything in this post