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Actually two reasons. The first is the fiber. Kale has the insoluble kind, which means it doesn’t break downit passes right through you. The other reason is a carbohydrate it contains called raffinose. Our bodies can’t break that down either during digestion. That’s according to the Johns Hopkins Digestive Center. Instead, the fiber and raffinose go straight to your colon where they ferment and send you running for the restroom. So lay off the kale if you won’t be near a bathroom for a while – or you’re on a date.