So what would you think would be the  top causes of delayed subway trains in big cities across the country? Poorly trained employees? Waiting for people to load and unload? Nope, none of the above. It’s crash dieters who faint from dizziness, according to the Metropolitan Transportation Authority. Yes, you read that right.

After track work and signal problems, ill passengers, most of them crash dieters, rated among the main reasons for subway disruptions. Medics have to respond when someone passes out, slowing down the trains. NBC News has more.

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