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Simple carbohydrates, often referred to as sugars, indeed have high caloric density. This means that they provide a significant amount of energy (calories) relative to their weight. Simple carbohydrates are found naturally in foods like fruits and milk, and they are also added to many processed foods. While they can provide quick bursts of energy due to their rapid digestion and absorption, they usually lack essential nutrients such as vitamins and minerals. This characteristic makes them a quick source of calories without much nutritional benefit.

In contrast, the other statements do not accurately reflect the nature of simple carbohydrates. They are not low in calories since they provide a high-calorie content compared to their nutrient profile. Additionally, simple carbohydrates are typically low in essential nutrients, contrary to what the second option suggests. Lastly, they are not made up of multiple saccharide units; rather, they consist of one or two sugar molecules, such as glucose (a monosaccharide) or sucrose (a disaccharide).