"In a study done by the Environmental Working Group, it was found that sugary cereals, packaged as a part of a “healthy breakfast”, can contain upwards of 50% sugar by weight. This is more sugar per serving than Twinkies or 3 chocolate chip cookies. This high level of sugar can be detrimental to the biology of your body, especially at breakfast. When you consume this much sugar in your first meal, blood sugar spikes, then drops, signaling your brain that you need more sugar. This can lead to a vicious cycle throughout the day of blood sugar highs and lows, which effect energy levels, concentration, and lead to the consumption of other sugary foods."