Understanding Nutrition and Obesity

From the study guide

Nutrition & Obesity Revision Sheet

1. 📌 Essentials

  • IMC (Body Mass Index): weight (kg) / height² (m² normal: 18.5–24.9.
  • BMR: energy needed for vital functions at rest. -TEE:** total energy expenditure = BMR + physical activity.
  • Energy conversion: 1 kcal = 4.187 kJ.
  • Macronutrient distribution: carbs (~50%), lipids (~30%), proteins (~15%).
  • Obesity: excess fat, diagnosed via IMC >30 or >25 + waist circumference.
  • Kwashiorkor: protein deficiency causing edema and growth retardation.
  • Diet imbalance: excess lipids, insufficient carbs/proteins.
  • Main causes of obesity: sedentary lifestyle, poor diet, genetics, psychological factors.
  • Surgical treatments: sleeve gastrectomy, gastric bypass, gastric banding.
  • Research focus: genetics, inflammation, microbiota, brain-gut axis.

2. 🧩 Key Structures & Components

  • Adipose tissue: stores excess lipids, involved in energy balance.
  • Hypothalamus: regulates hunger, satiety, and energy expenditure.
  • Gastrointestinal tract: signals satiety/hunger via hormones.
  • Lipid droplets: intracellular storage form of fats.
  • Microbiota: gut bacteria influence energy absorption and metabolism.
  • Hormones: leptin, ghrelin, insulin regulate appetite and storage.
  • Liver: central in lipid and carbohydrate metabolism.
  • Muscle tissue: major site of energy utilization.
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Practice quiz preview

1. What is the primary purpose of calculating the Body Mass Index (BMI) in nutritional assessment?

2. Which of the following factors most significantly influences an individual's Total Energy Expenditure (TEE)?

3. What is a common characteristic of dietary imbalance leading to health issues?

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Flashcard preview

IMC — normal range?

18.5–24.9

BMR — role?

Energy for vital functions

Obesity — diagnosis criteria?

IMC >30 or >25 with waist circumference

IMC — normal range?

18.5–24.9 kg/m²

BMR — role?

Energy needed at rest

Obesity — IMC threshold?

Over 30 or over 25 + waist

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The practice quiz has 10 multiple-choice questions, each with an explanation. Use it to check what you know and find your gaps.

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