No less a magazine than Mother Jones recently published an account of an alternative medicine researcher claiming the truly horrifying: kale might be bad for you. His patients, otherwise healthy, started presenting with digestive problems, fatigue, and skin and hair problems. He found that a lot of them had elevated thallium levels — and that a lot of them ate significant amounts of brassicas, the plant family that includes kale and cabbage. When he had some patients remove these foods from their diet, their thallium levels dropped and their symptoms improved.
Monya De, MD MPH 