Fabian: Have you got a telephone directory? is 600mg of ibuprofen a day safe “Greek yogurt has totally taken off ... it wouldn't surprise me that this is definitely a trend. Greek yogurt is higher in protein so people really seem to like that; it's also a little bit creamier. I have clients who love regular kefir and will gravitate towards this," said Dr. Lisa Young, a New York nutritionist and adjunct professor of Nutrition and Food Studies at New York University.