The taste of vanilla is fairly neutral. Lumps can occur when the milk is too cold, but that can not find a problem. Ordinary shaker should have but otherwise it increases the risk of clumping. Perhaps even better let stand a little in order not to swallow too much air whipped with ... that bends slightly to unwanted bloating before;) Otherwise, the stomach should be still used to it and you should not perhaps equal to a shake drink early as the first meal on an empty stomach because that could cause rapid bowel movements. Even the meal replacement shake should never be only supplementary. 3 Orderntliche meals a day and in between 1-2 shakes a day. But one should also not his life since taking to the kidneys and liver have to metabolize everything and although fortunately no Asphartam contained in it, so still all ingredients are not acceptable in the long run.