<body><h1>Sugars or carbohydrates:</h1><p>These include sugary, starchy and vegetable fibers:These substances are the main source of energy for large segments of the people in the worldThey may be simple monosaccharides, such as glucose, fructose, and galactose, or double-sucrose, lactose and maltose, or multiple sugars, such as starch, glycogen, cellulose fibers, and pectins.As for fiber, they are complex sugars that are difficult to digest, and they do not constitute an important source of energy, but they are useful for the work of the human digestive system.Food rich in sugars include rice, corn, wheat and other grains, potatoes, legumes, fruits, and various sweets. Glucose, or (dextrose), is the most important source of energy in order to benefit from it directly. It is necessary for the brain function and some call it “blood sugar”.Glucose is found naturally in many fruits and vegetables, and it can combine with other monosaccharides, so it becomes like the sugar that we consume daily in tea and coffee, which is sucrose, and its molecules consist of two simple monosaccharides, glucose and fructose, and the latter is at least one and a half times sweeter than the first one.There is another disaccharide that you find in our daily food, such as milk and breastfeeding mother’s milk as well, which is lactose, and its molecule consists of glucose and galactose sugar, and starchy substances give maltosewhen broken down, which consists of two units of glucose.All these sugars, after digestion, are converted into glucose, so that the body can benefit from it by taking on an energy-producing substance immediately, and excess of it is converted in the liver and muscles into storedglucose, called glycogen, or also into fats.When the level of glucose in the blood falls below the normal limit, glycogen degrades to supply it directly to the body, and this mechanism is very importantfor people who engage in a lot of physical activity.</p></body>