The foods that natural man ate contained only small amounts of sugar, and as these were absorbed from the stomach and intestines, his appetite disappeared when the sugar reached the bloodstream. Some would be the sugars contained in the food, but most would come from the breakdown of starch. Starch is a complex chain made up of sugar units which are broken off one at a time by the digestive enzymes so that they reach the bloodstream over a period of time. As one digests the starch he also digests and absorbs the numerous other nutrients which he needs. Later, when man discovered how to extract the sugar from plants, he could eat straight sugar. In this form sugar is immediately absorbed by the body, hunger disappears immediately and there is a quick rush of energy, but also a period of exhaustion and weakness afterwards. This weakness leads to a craving for another dose of sugar, and this is how sugar addiction starts.
What is commonly known as white sugar is also called sucrose, a highly refined product, and a pure chemical product. Brown sugar is sucrose with the addition of a small amount of molasses. Sucrose is present (that is, added to) a lot of foods. I knew that there is a lot of sugar in soft drinks and jam for example, but to my surprise I learned that sugar is also added to bread, meat products, processed vegetables and even some tooth paste!

It is widely known that white sugar is bad for teeth, but the consumption of white sugar has more, far reaching consequences. The metabolism of sugar requires accessory nutrients which are involved in its combustion, including vitamins, minerals and even some protein and fat molecules. These elements are depleted by the consumption of refined sugar. When eating sugar becomes a habit, the supply of vitamins and minerals is used up, and eventually such nutrients must be pulled from tissues in the body in order to continue support of the metabolic activities fueled by sugar. Even though most people are aware only of the weight gained consumption of quantities of refined sugar, it can result in the body becoming increasingly deficient in important nutrients. In some cases only a limited amount of the sugar is burned since one feels too tired to be very active. Without the desire for exercise, much of the sugar is stored away as fat. The result is an unnatural obesity that has come to characterize those who regularly consume soft drinks, candy and so on, incurring a nutrient debt which they never pay off. Hunger and craving for more food goes along with it as the body searches for what it really needs. With modern refined foods (which by themselves have a shortage of vitamins and minerals), especially those containing a large amount of sugar, obesity and malnutrition may occur together. Eating more this way will not improve one's health, on the contrary.
I have also found that studies have shown that eating white sugar and other sweets can in effect "paralyze" the white blood cells for half an hour or more. Any interference with the white blood cells' work can result in an infection or overgrowth of normal micro-organisms. The toxins produces by the infecting organism can further strain an already overloaded lymph system and make the immune system even weaker.
I grew up with white sugar, present in all the foods and candy I was eating. That is why all my molars have dental fillings. I slowly changed over to a more healthy diet, and at present I rarely eat something that has white sugar in it. My tooth decay has drastically dropped. Last time I needed dental work was to replace an old filling. But I am still human, and that means I still like sweet things. So, when I make a cake, I use "evaporated cane sugar", sometimes called "evaporated cane juice", this sugar is cane juice from which the water has been evaporated and the fiber has been removed. Then it is crystallized and granulated, keeping most of its vitamins and minerals. The nice thing about evaporated cane sugar is that it does not cause tooth decay, nor diabetes (which is strongly linked to the consumption of white sugar). We bake our own bread and use evaporated cane sugar in the recipes. When you buy your food read the labels to see how much white sugar it contains. Try to limit it as much as possible!
Another natural sweetener you could use is Stevia, a sweet product with a taste close to sugar, made from the Stevia plant. It also comes in liquid form and can be found in health food stores. Info about Stevia: http://www.stevia.net/ 

 
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