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Dietary components fuels

In order to survive, humans mnst meet two basic metabolic requirements we mnst be able to synthesize everything onr cells need that is not supplied by our diet, and we must be able to protect our internal environment from toxins and changing conditions in onr external environment. In order to meet these reqnirements, we metabolize onr dietary components through four basic types of pathways fuel oxidative pathways, fuel storage and mobilization pathways, biosynthetic pathways, and detoxification or waste disposal pathways. Cooperation between tissnes and responses to changes in onr external environment are commn-nicated thongh transport pathways and intercellnlar signaling pathways (Fig. 1.1). [Pg.1]

In the following section, we will provide an overview of varions types of dietary components and examples of the pathways involved in ntilizing these components. We will describe the fuels in our diet, the compounds produced by their digestion, and the basic patterns of fuel metabolism in the tissues of our bodies. We will describe how these patterns change when we eat, when we fast for a short time, and when we starve for prolonged periods. Patients with medical problems that involve an inability to deal normally with fuels will be introduced. These patients will appear repeatedly throughout the book and will be joined by other patients as we delve deeper into biochemistry. [Pg.2]

All cells continuously use ATP and require a constant supply of fuels to provide energy for the generation of ATP. Chapters 1 through 3 of this text outline the basic patterns of fuel utilization in the human and provide information about dietary components. [Pg.339]

Metabolic fuel Those dietary components that are oxidized as a source of metabolic energy fats, carbohydrates, proteins and alcohol. [Pg.423]

First, several reports over the last 25 yr show that carbon recycling from a-linolenate in neonatal rats and near-term primate fetuses consumes the majority of a-linolenate that is not used as a fuel. Second, a-linolenate cannot be synthesized de novo by mammals and is the main dietary precursor to the n-3 long-chain polyunsaturated fatty acids (LC-PUFAs), eicosapentaenoate (20 5n-3) and docosahexaenoate (22 6n-3), which have important regulatory and membrane functions, respectively. Thus, a-linolenate is a vitamin-like nutrient that would not be expected to be easily p-oxidized or extensively carbon recycled into other lipids when it already has an important precursor role for membrane components needed for normal development of the visual and nervous systems. [Pg.145]

There are a number of other polysaccharides in foods. Collectively they are known as non-starch polysaccharides, the major components of dietary fibre (section 7.3.3.2). Non-starch polysaccharides are not digested by human enzymes, although all can be fermented to some extent by intestinal bacteria, and the products of bacterial fermentation may be absorbed and metabolized as metabolic fuels. The major nonstarch polysaccharides (shown in Figure 4.8) are ... [Pg.88]

Dietary SFAs are abundantly present in animal products, but can also be found in plant products. The major SFAs in the diet include caprylic acid (C8 0), caproic acid (C10 0), lauric acid (C12 0), myristic acid (C14 0), palmitic acid (C16 0) and stearic acid (C18 0 National Academy of Sciences et al., 2005). SFAs have two primary functions in the body they serve as a source of energy and are structural components of cell membranes (National Academy of Sciences et al., 2005). SFAs are not essential in the diet as they can be synthesized as needed from other fuel sources. In addition, SFAs are not associated with a beneficial role in the prevention of chronic disease, and neither an Al, EAR nor RDA has been set for SFA intake (National Academy of Sciences et al., 2005). [Pg.256]


See other pages where Dietary components fuels is mentioned: [Pg.122]    [Pg.1]    [Pg.3]    [Pg.5]    [Pg.9]    [Pg.11]    [Pg.13]    [Pg.15]    [Pg.19]    [Pg.472]    [Pg.585]    [Pg.585]    [Pg.143]    [Pg.216]    [Pg.469]   
See also in sourсe #XX -- [ Pg.2 ]




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Fuel components

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