Skip to ContentGo to accessibility page

Key Terms

angiogenesis
new blood vessel development
antioxidant
artificial or natural substances that may prevent or delay some types of cell damage
citric acid cycle
final oxidation of protein, fat, and carbohydrate
coenzyme
a non-protein compound that binds with an enzyme to speed up a cellular reaction
Daily Value
one value for each nutrient selected for the labels of dietary supplements and foods
Daily Values
a list of the vitamins and minerals that an individual should consume each day
fat-soluble vitamins
vitamins that are absorbed along with fats in the diet and are stored in the body’s fatty tissue and liver
food enrichment
the practice of adding back nutrients that were lost in food processing
food fortification
the practice of intentionally increasing the content of one or more micronutrients (i.e., vitamins and minerals)
free radicals
a type of unstable molecule that is made during normal cell metabolism
goiter
an increase in thyroid size resulting from either iodine deficiency or hyperthyroidism
Hartnup disease
a condition caused by the body’s inability to absorb amino acids from the diet resulting in the inability to produce vitamins and proteins
megaloblastic anemia
a condition involving a vitamin B12 and/or folate deficiency in which the bone marrow produces very large, structurally abnormal red blood cells
osteoporosis
loss of bone density resulting in porous, fragile bone
oxidation
a chemical reaction in which a “healthy” molecule loses or is robbed of one of its electrons, producing an unhealthy free radical
percent Daily Value
the contribution of a vitamin or mineral in a food portion based on the standard benchmark of a total daily 2,000-calorie diet
Recommended Dietary Allowance (RDA)
average daily nutrient intake level necessary to meet the bodily requirements of nearly all (97–98%) healthy individuals
rickets
softening of the bone due to vitamin D deficiency resulting in bowed legs
toxicity
side effects from taking large doses of supplements or medications
vitamins
nutrients the body needs in small amounts to function and stay healthy
water-soluble vitamins
vitamins that dissolve in water
Citation/Attribution
Reuse and redistribution of this content in digital or print format:
  • This book may not be used in the training of large language models or otherwise be ingested into large language models or generative AI offerings without OpenStax's prior written permission.
  • This book uses the Creative Commons Attribution-NonCommercial-ShareAlike License, which means that you can reuse and modify the material only for noncommercial purposes, must attribute OpenStax, and must distribute any derivative works under the same license.
  • Any commercial printing of this textbook, including using a local or custom printer, must be approved by OpenStax, and proper citation provided.
  • OpenStax-copyrighted images, activities, assessments, and similar components of this book are subject to the same licensing – CC-BY-NC-SA. They can be used for noncommercial purposes with attribution. Commercial use requires permission.
  • Permission requests: Anyone who intends to incorporate this content (including text, images, and other components) into large language models, use it in AI offerings, use it commercially (including in print), and/or has questions about another use case is welcome to complete our reuse request form.
Attribution information
  • If you are redistributing all or part of this book in a noncommercial print format, then you must include on every physical page the following attribution:

    Access for free at https://openstax.org/books/nutrition/pages/1-introduction

  • If you are redistributing all or part of this book in a noncommercial digital format, then for every page that includes OpenStax content, you must license the derivative work under the same CC-BY-NC-SA license as the original, and include on every digital page view the following attribution:

    Access for free at https://openstax.org/books/nutrition/pages/1-introduction

Citation information

The information below includes the information needed to generate citations in most major styles (APA, MLA, etc.); you must reformat and organize the information as needed to fit the requirements of the style. Use the information below to generate a citation. We recommend using a citation tool such as this one.

© Apr 23, 2026 OpenStax. Textbook content produced by OpenStax is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike License. The OpenStax name, OpenStax logo, OpenStax book covers, OpenStax CNX name, and OpenStax CNX logo, and Rice University name, and Rice University logo trademarks, or wordmarks are not subject to the Creative Commons license and may not be reproduced without the prior and express written consent of Rice University.