A. No, excess of anything is harmful. Kohlrabi is rich in fibres which can lead to gastrointestinal problems like bloating, diarrhoea or vomiting. Hyperkalemia can occur when potassium intake is very high, which can lead to heart attacks. Kohlrabi is rich in potassium and can lead to such symptoms if taken in excess. Additionally, it is a cruciferous vegetable that can block the intake of iodine.