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for carbohydrates: simple carbohydrates are available rapidly, whereas complex ones, which need to be digested, are available on longer time. You can think of what are advised when you need a rapid boost or before sport. As examples, for simple carbohydrates you could think of fructose found in fruits; complex ones could be starch found in pasta.
For lipids: unsaturated lipid are more liquid at room temperature than saturated lipids. so you need to find an oil and some more solid fat.
For proteins: you are looking for a protein of the cytoskeleton and one enxyme.
Simple carbohydrates are quick energy sources, but they do not usually supply any other nutrients or fiber Glucose is the major kind of simple sugar. Fructose: known as fruit sugar. Most plants contain fructose, especially fruits and saps. Complex carbohydrates often supply energy and other nutrients and fiber that the body needs. They are a better choice. STARCH - in the body breaks down into simple sugars. The body has to break down all sugar/starch into glucose to use it. Starch supplies the body with long, sustained energy. DIETARY FIBER - which is found in plant cells. Because it is tough and stringy, it does not break down completely in the body. Fiber is essential for regulating the body. It is the non-digestible part of plants. These fats are derived from animal products such as meat, dairy and eggs. But they are also found in some plant-based sources such as coconut, palm and palm kernel oils. These fats are solid at room temperature. Saturated fats directly raise total and LDL (bad) cholesterol levels. Unsaturated fats Monounsaturated fats and polyunsaturated fats are two types of unsaturated fatty acids. They are derived from vegetables and plants. Monounsaturated fats are liquid at room temperature but begin to solidify at cold temperatures. This type of fat is preferable to other types of fat and can be found in olives, olive oil, nuts, peanut oil, canola oil and avocados. Some studies have shown that these kinds of fats can actually lower LDL (bad) cholesterol and maintain HDL (good) cholesterol. Polyunsaturated fats are also liquid at room temperature. These are found in safflower, sesame, corn, cottonseed and soybean oils. This type of fat has also been shown to reduce levels of LDL cholesterol, but too much can also lower your HDL cholesterol. Structural proteins Structural proteins confer stiffness and rigidity to otherwise-fluid biological components. Most structural proteins are fibrous proteins; for example, actin and tubulin are globular and soluble as monomers, but polymerize to form long, stiff fibers that make up the cytoskeleton, which allows the cell to maintain its shape and size. Collagen and elastin are critical components of connective tissue such as cartilage, and keratin is found in hard or filamentous structures such as hair, nails, feathers, hooves, and some animal shells i dont get metabolic proteins ....proteins function as enzymes to speed up reactions is this what u meant?
For metabolic proteins: yes the metabolism is regulated by enzymes. this is the way the body can control which reactions take place.
for cellulose (fibers) one of the problems for digestion is that we do not have the enzymes to digest specific links not found in animal sugar polymers.