This document discusses various food sources and nutrients that provide energy and physical components necessary for human survival, growth, and reproduction. It explains that calories provide energy for bodily functions and movement, and that being overweight or underweight can impact health. It also outlines that proteins, carbohydrates, and fats are important macronutrients that serve as energy sources and building blocks, with proteins found in foods like meat and grains, carbohydrates providing glucose from sugars and starches, and fats storing energy and aiding nutrient absorption.

1. Food sources and nutrition

2. calorie
s
• We need calories to give us enough energy to
move around, stay warm, grow, work, think, and
play. Even our blood circulation and digestion
need the energy gained from calories in order to
function well.
•

4. Being overweight or fat is
having more body fat than is
optimally healthy. Being
overweight is especially
common where food
supplies are plentiful
and lifestyles are sedentary.
Being underweight can be a
symptom of an underlying
condition, in which case it is
secondary. Unexplained
weight loss may require a
professional medical
diagnosis

5. • Nutrients are substances that provide energy and physical
components to the organism, allowing it to survive, grow,
and reproduce. Nutrients can be basic elements or
complex macromolecules.

6. protein
• Protein is a nutrient needed by the human body for growth and maintenance
• Protein can be found in all cells of the body and is the major structural component of all cells
in the body, especially muscle
• Protein sources areMeat, dairy, eggs, soy, fish, whole grains, and cereals
This Photo by Unknown author is licensed under CC BY.

7. carbohydrates
• Carbohydrates (also called carbs) are a type
of macronutrient found in certain foods and
drinks. Sugars, starches and fiber are
carbohydrates.
• Carbohydrates provide the body with the
energy it needs and are a good source of
many vitamins and minerals.

8. Fats and olis
• Despite its bad image, fat has many important
functions in our body. Fat stores and provides
energy when food intake is limited, aids in the
absorption of fat-soluble vitamins (such as vitamin
A, D, E and K), surrounding fats protect vital
organs (like kidney and gut) against physical
shock and fats beneath the skin help preserve
body heat. Fat is also a building block for
hormones and cell membranes.
• The most obvious and defining difference
between fats and oils is that fats are typically solid
at room temperature whereas oils are liquid at
room temperature.