Almost all foods give us energy. Some give us more energy than others. Energy is【B1】in calories. Foods rich in【B2】, starches or sugars have a lot of calories. At【B3】you eat foods that have more energy than you need. The extra energy is stored in the【B4】as fat. If you eat too much, you become overweight. When you eat fewer calories than the body uses, you【B5】weight. The body can choose what it needs from the nutrients in the【B6】. Your body sees to it【B7】each organ gets the right amount of nutrients it needs. However, if the diet lacks some nutrients, the body has no【B8】of getting them. Your body works twenty four hours a day. It is always building itself【B9】, and getting rid of waste products. It needs a constant【B10】of nutrients to do its job. When it receives the nutrients, it sends them【B11】they are needed. Nutrients working with other nutrients【B12】the difference in our health and well-being. No single nutrient can work properly【B13】. For example, it takes calcium to build strong bones, but that is only the【B14】. Without vitamin D, the calcium can not be taken【B15】the body. The use of protein is another【B16】. Protein forms part of every cell and all the fluids that【B17】in and around the cells. However, it takes vitamin C to help make the fluids between the cells.【B18】vitamin C, the protein could not do its job. The foods you eat keep you.【B19】for today, but they also build your body for a lifetime. They keep you well today, tomorrow, and【B20】. 【B1】