Can not, any item has his half-life, manufacturers are calculated its half-life before judging its shelf life, expired milk powder, all kinds of nutrient loss, such as the loss of amino acids in the expired milk powder up to 40% or more, the human body's digestive utilization of it is also reduced by 5% to 6%; there are beyond the shelf life of the deterioration of the problem, or by bacterial contamination, people in the water when brewing, the general hot water And can not kill these bacteria and micro-organisms, human consumption will jeopardize health, so it is best not to eat.