---
id: nutrition-science
title: "Nutrition Science: Macronutrients, Micronutrients, and Diet"
schema_type: Article
category: health
language: en
confidence: high
last_verified: "2026-05-24"
created_date: "2026-05-24"
generation_method: ai_assisted
ai_models:
  - claude-opus
derived_from_human_seed: true
conflict_of_interest: none_declared
is_live_document: false
data_period: static
atomic_facts:
  - id: fact-hlth-nut-001
    statement: "WHO: <5g salt/day, <10% energy from free sugars, 400g+ fruits/veg daily."
    source_title: WHO Healthy Diet Fact Sheet (2024)
    source_url: https://www.who.int/news-room/fact-sheets/detail/healthy-diet
    confidence: high
  - id: fact-hlth-nut-002
    statement: "Mediterranean diet: 25-30% CVD event reduction (PREDIMED trial, NEJM 2013/2018)."
    source_title: Estruch et al. Mediterranean Diet for CVD Prevention (NEJM 2018)
    source_url: https://doi.org/10.1056/NEJMoa1800389
    confidence: high
  - id: fact-hlth-nut-003
    statement: EAT-Lancet Commission (2019) proposed planetary health diet for 10B people by 2050.
    source_title: "Willett et al. Food in the Anthropocene: EAT-Lancet (Lancet 2019)"
    source_url: https://doi.org/10.1016/S0140-6736(18)31788-4
    confidence: high
completeness: 0.9
primary_sources:
  - title: Understanding Nutrition, 16th Edition (Whitney & Rolfes)
    type: textbook
    year: 2021
    url: https://www.cengage.com/c/understanding-nutrition-16e-whitney/9780357447628/
    institution: Cengage
  - title: WHO Healthy Diet Fact Sheet
    type: official_report
    year: 2024
    url: https://www.who.int/news-room/fact-sheets/detail/healthy-diet
    institution: WHO
known_gaps:
  - Personalized nutrition (nutrigenomics)
  - Ultra-processed food health effects
disputed_statements:
  - statement: No major disputed statements identified
secondary_sources:
  - title: Understanding Nutrition (Whitney & Rolfes, 16th Edition)
    type: textbook
    year: 2024
    authors:
      - Whitney, Ellie
      - Rolfes, Sharon Rady
    institution: Cengage Learning
    url: https://www.cengage.com/c/understanding-nutrition-16e-whitney/
  - title: Modern Nutrition in Health and Disease (Ross et al., 12th Edition)
    type: textbook
    year: 2024
    authors:
      - Ross, A. Catharine
      - Caballero, Benjamin
      - Cousins, Robert J.
      - Tucker, Katherine L.
      - Ziegler, Thomas R.
    institution: Wolters Kluwer
    url: https://www.lww.com/modern-nutrition-in-health-and-disease/p/9781284220315
  - title: "WHO Fact Sheet: Healthy Diet (Updated 2024)"
    type: report
    year: 2024
    authors:
      - WHO
    institution: World Health Organization
    url: https://www.who.int/news-room/fact-sheets/detail/healthy-diet
  - title: FAO State of Food Security and Nutrition in the World 2024
    type: report
    year: 2024
    authors:
      - FAO/IFAD/UNICEF/WFP/WHO
    institution: FAO
    url: https://www.fao.org/publications/sofi/2024/en/
updated: "2026-05-24"
---
## TL;DR
Nutrition science studies how food components affect human health. The balance of macronutrients (carbs, proteins, fats) and adequacy of micronutrients (vitamins, minerals) determine physiological function and disease risk.

## Core Explanation
Macronutrients: carbohydrates — simple (sugars) vs complex (starches, fiber). Glycemic index measures blood sugar response. Proteins — composed of 20 amino acids (9 essential, must come from diet). Fats — saturated (solid at room temp), unsaturated (liquid), trans (industrial, harmful). Micronutrients: vitamins (A, B-complex, C, D, E, K) and minerals (calcium, iron, zinc, iodine).

## Detailed Analysis
Dietary patterns: Mediterranean (olive oil, vegetables, fish — associated with 25-30% CVD reduction), DASH (hypertension reduction), plant-based. The double burden of malnutrition — undernutrition and obesity coexisting — affects many developing nations.

## Further Reading
- Harvard Nutrition Source
- USDA Dietary Guidelines
- FAO: Food-Based Dietary Guidelines