5:2 diet is a bit different in that there is a significant caloric deficit on those two fasting days (you only eat up to 500 calories). Most people, myself included, do tend to eat no or low carbs, higher in protein and healthy fats on fasting days because you get more "bang for your buck" with your 500 calories. Lots of veggies, too.
I would think that by only restricting what you eat two days a week, rather than necessarily how much, you may not actually get any sort of calorie deficit. Or it may be very small. But you never know until you try!
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