nutrients

Question 1

carbohydrates

Answer 1

Most carbohydrates in our diet come from plant-based foods, especially:

Starches (a polysaccharide) → found in grains, legumes, root vegetables

Sugars → from fruits, vegetables, and sugar cane

There are two key exceptions that come from animal sources:

Lactose — a sugar found in milk and dairy

Glycogen — found in small amounts in meat, but it’s mostly broken down quickly after slaughter, so it’s not a major dietary source

Question 2

what every carbohydrates is in

Answer 2

Most of the carbohydrates we eat come from plants, and they can be divided into different types depending on their structure and function.

Starch is a complex carbohydrate (a polysaccharide) found in grains, legumes, and root vegetables like potatoes. It’s made up of long chains of glucose and serves as a plant’s way of storing energy. When we eat starch, our body breaks it down into glucose to use for energy.

Glucose is a simple sugar (a monosaccharide) that naturally occurs in fruits, some vegetables (like corn and carrots), and honey. It’s also the main sugar our body uses for energy and the end product of digesting most carbohydrates.

Fructose is another monosaccharide, found mainly in fruits, honey, and some vegetables. It’s sweeter than glucose and combines with it to form the disaccharide sucrose (table sugar).

Lactose is a sugar found only in milk and dairy products. It’s a disaccharide made of glucose and galactose. Galactose, like glucose and fructose, is a monosaccharide but is mostly found as part of lactose.

Glycogen is a polysaccharide like starch, but it comes from animals. It’s how animals, including humans, store glucose — mainly in the liver and muscles. Although meat contains small amounts of glycogen, it breaks down quickly after slaughter, so it’s not a major part of our diet.

Cellulose is another plant polysaccharide, found in vegetables, especially leafy ones, and in whole grains. Unlike starch, cellulose cannot be digested by humans because we lack the enzyme cellulase. Still, it’s very important in the diet as fiber — it adds bulk to stool, helps move waste through the colon, and supports digestive health.

Carbohydrate | Found In | Type | Notes |

Question 3

lipids

Answer 3

Dietary Lipids Overview
Although we do consume some cholesterol and phospholipids, the majority of dietary fats are triglycerides, also called neutral fats. These make up the bulk of the lipids in our diet.

🥩 Saturated Fats
Found mainly in animal products such as:

Meat

Butter

Cheese

Whole milk

Also found in a few plant sources, such as:

Coconut oil

Palm oil

These fats are typically solid at room temperature.

🌰 Unsaturated Fats
Found mostly in plant-based foods, such as:

Nuts

Seeds

Vegetable oils (like olive, canola, sunflower)

Usually liquid at room temperature

Often considered healthier fats

🥚 Cholesterol
A type of lipid that’s only found in animal-derived foods, including:

Egg yolks

Meat

Milk and dairy products

Note: The body also makes its own cholesterol in the liver, so we don’t rely entirely on dietary sources.

Question 4

protiens

Answer 4

Dietary Proteins: Complete vs. Incomplete
🧬 What are proteins?
Proteins are long chains of amino acids (amino acid polymers).

The body uses them for tissue growth, repair, enzymes, hormones, and more.

✅ Complete Proteins
Contain all 8 essential amino acids (the ones your body cannot make on its own).

Found in animal products, including:

Eggs

Milk

Fish

Meat

Also found in some plant sources, like:

Soy

Quinoa

✅ These are called complete proteins because they meet all the body’s amino acid requirements.

❌ Incomplete Proteins
Found in plant-based foods like:

Legumes (beans, peas, lentils)

Nuts

Cereal grains (wheat, rice, oats, etc.)

These proteins lack one or more essential amino acids, so they’re considered incomplete.

🥗 Vegetarian Diet Tip
Vegetarians and especially vegans need to combine different plant protein sources to get all essential amino acids.

Common combo:

Grains + legumes = a complete protein (e.g., rice and beans, peanut butter on whole wheat, hummus and pita)

🌱 This is called protein complementation and is key to preventing protein malnutrition in plant-based diets.

🧠 Summary:
Animal proteins = complete

Most plant proteins = incomplete

But plant combinations (like rice + beans) or soy/quinoa = complete

Question 5

vitamens

Answer 5

Vitamins: Essential Organic Nutrients
Vitamins are organic compounds that the body needs in small amounts.

Most vitamins serve as coenzymes or parts of coenzymes, meaning they help enzymes perform specific chemical reactions (catalysis) in the body.

🍎 Sources and Importance
Vitamins are found across all major food groups, but no single food contains all vitamins.

Because of this, eating a balanced diet is the best way to ensure you get all the necessary vitamins.

🛡️ Vitamin Benefits and Controversies
Vitamins A, C, and E are noted for their potential anticancer properties.

Eating vegetables like broccoli, cabbage, and Brussels sprouts (rich in vitamins A and C) is associated with a reduced risk of cancer.

However, the overall ability of vitamins to prevent or cure diseases is still debated and not conclusively proven.

Question 6

minerals

Answer 6

Minerals: Essential Inorganic Nutrients
The body needs adequate amounts of seven major minerals:

Calcium

Phosphorus

Potassium

Sulfur

Sodium

Chloride

Magnesium

In addition, the body requires trace amounts of about a dozen other minerals (called trace minerals).

🥦 Sources of Minerals
Fats and sugars contain almost no minerals.

Cereals and grains are generally poor sources of minerals.

The richest sources of minerals are:

Vegetables

Legumes (beans, peas)

Milk and dairy products

Some meats

🧠 Additional Info
Minerals play many important roles in body functions, which are discussed more in the metabolism section.

Appendix D (in your text) gives more details on how vitamins and minerals work in the body.