4: Carbohydrates
- Page ID
- 156268
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\(\newcommand{\avec}{\mathbf a}\) \(\newcommand{\bvec}{\mathbf b}\) \(\newcommand{\cvec}{\mathbf c}\) \(\newcommand{\dvec}{\mathbf d}\) \(\newcommand{\dtil}{\widetilde{\mathbf d}}\) \(\newcommand{\evec}{\mathbf e}\) \(\newcommand{\fvec}{\mathbf f}\) \(\newcommand{\nvec}{\mathbf n}\) \(\newcommand{\pvec}{\mathbf p}\) \(\newcommand{\qvec}{\mathbf q}\) \(\newcommand{\svec}{\mathbf s}\) \(\newcommand{\tvec}{\mathbf t}\) \(\newcommand{\uvec}{\mathbf u}\) \(\newcommand{\vvec}{\mathbf v}\) \(\newcommand{\wvec}{\mathbf w}\) \(\newcommand{\xvec}{\mathbf x}\) \(\newcommand{\yvec}{\mathbf y}\) \(\newcommand{\zvec}{\mathbf z}\) \(\newcommand{\rvec}{\mathbf r}\) \(\newcommand{\mvec}{\mathbf m}\) \(\newcommand{\zerovec}{\mathbf 0}\) \(\newcommand{\onevec}{\mathbf 1}\) \(\newcommand{\real}{\mathbb R}\) \(\newcommand{\twovec}[2]{\left[\begin{array}{r}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\ctwovec}[2]{\left[\begin{array}{c}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\threevec}[3]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\cthreevec}[3]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\fourvec}[4]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\cfourvec}[4]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\fivevec}[5]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\cfivevec}[5]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\mattwo}[4]{\left[\begin{array}{rr}#1 \amp #2 \\ #3 \amp #4 \\ \end{array}\right]}\) \(\newcommand{\laspan}[1]{\text{Span}\{#1\}}\) \(\newcommand{\bcal}{\cal B}\) \(\newcommand{\ccal}{\cal C}\) \(\newcommand{\scal}{\cal S}\) \(\newcommand{\wcal}{\cal W}\) \(\newcommand{\ecal}{\cal E}\) \(\newcommand{\coords}[2]{\left\{#1\right\}_{#2}}\) \(\newcommand{\gray}[1]{\color{gray}{#1}}\) \(\newcommand{\lgray}[1]{\color{lightgray}{#1}}\) \(\newcommand{\rank}{\operatorname{rank}}\) \(\newcommand{\row}{\text{Row}}\) \(\newcommand{\col}{\text{Col}}\) \(\renewcommand{\row}{\text{Row}}\) \(\newcommand{\nul}{\text{Nul}}\) \(\newcommand{\var}{\text{Var}}\) \(\newcommand{\corr}{\text{corr}}\) \(\newcommand{\len}[1]{\left|#1\right|}\) \(\newcommand{\bbar}{\overline{\bvec}}\) \(\newcommand{\bhat}{\widehat{\bvec}}\) \(\newcommand{\bperp}{\bvec^\perp}\) \(\newcommand{\xhat}{\widehat{\xvec}}\) \(\newcommand{\vhat}{\widehat{\vvec}}\) \(\newcommand{\uhat}{\widehat{\uvec}}\) \(\newcommand{\what}{\widehat{\wvec}}\) \(\newcommand{\Sighat}{\widehat{\Sigma}}\) \(\newcommand{\lt}{<}\) \(\newcommand{\gt}{>}\) \(\newcommand{\amp}{&}\) \(\definecolor{fillinmathshade}{gray}{0.9}\)Macronutrients are the fundamental building blocks of the human diet, providing the energy and raw materials our bodies need to function, grow, and thrive. These nutrients — carbohydrates, proteins, and fats — are required in large amounts and each plays a unique and vital role in maintaining health. Carbohydrates are the body’s primary energy source. Proteins support tissue growth and repair, and fats provide essential fatty acids and aid in the absorption of fat-soluble vitamins. Understanding how macronutrients work, how much we need, and how to choose high-quality sources is essential for making informed dietary decisions.
Carbohydrates are especially important for the brain and nervous system. Chemically, carbohydrates are organic compounds made up of carbon, hydrogen, and oxygen atoms, typically in a 1:2:1 ratio and represented by the formula (CH₂O)n, where n is the number of carbons in the molecule. This formula also explains the origin of the term “carbohydrate”: the components are carbon (“carbo”) and the parts of water (hence, “hydrate”). The basic building block of all carbohydrates is the sugar molecule, also known as a monosaccharide (Figure 4.1).
- 4.1: Classification of Carbohydrates
- This page covers carbohydrates classification into simple (monosaccharides and disaccharides) and complex (oligosaccharides and polysaccharides), detailing their structures, functions, and health benefits. Monosaccharides like glucose provide energy, while disaccharides can cause issues like lactose intolerance. It distinguishes between naturally occurring and added sugars, highlighting health risks of excessive added sugar intake and recommending limits.
- 4.2: Nutrition And Diabetes Mellitus
- This page covers the hormonal regulation of blood glucose, focusing on insulin and glucagon's roles in glucose homeostasis. It explains how insulin decreases blood glucose post-meals while glucagon raises it during fasting. Additionally, it addresses diabetes mellitus, noting its rising prevalence, especially in low-income regions, and differentiates between type 1 diabetes, which requires insulin therapy, and type 2 diabetes, linked to insulin resistance and lifestyle choices.
- 4.3: Carbohydrate Recommendations
- This page discusses the Dietary Guidelines for Americans, recommending carbohydrates to constitute 45–65% of daily calories, or 225 to 325 grams in a 2,000-calorie diet. A minimum of 130 grams is advised for optimal brain function. It emphasizes the importance of complex carbohydrates from whole grains, fruits, and vegetables while urging the limitation of added sugars and refined grains due to their low nutritional benefits and associated health risks.
- 4.4: Chapter 4 References
- This page offers a comprehensive overview of nutrition and dietary guidelines, highlighting essential resources such as textbooks and credible articles. It covers a range of topics including photosynthesis, carbohydrates, sweeteners, dietary fiber, lactose intolerance, and diabetes. Key references are from OpenStax and the Academy of Nutrition and Dietetics, emphasizing the significance of nutrition in health guidelines and physiological processes.