In simple terms, blood sugar is the concentration of glucose (or sugar) in your blood. Whenever you eat a meal, your body receives a surge of sugar and other nutrients from food as it gets digested. The sugar broken down from carbohydrates gets transported to your bloodstream, where the hormone insulin is released to bring the sugar from your bloodstream into your cells to be used for energy. If your energy stores are full during the time of digestion, insulin will signal for any excess sugar to get stored elsewhere in your body as fat. If your blood sugar levels are consistently high (which results from eating a diet high in refined sugar), you can bet that your pancreas is working overtime to produce enough insulin to deal with the sugar it’s constantly receiving.