Ever wondered what's actually in the food you eat and... Show more
Biology
English
Irish
Agricultural Science
Mathematics
PhysicsSign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
23
•
Updated 16 Feb 2026
•
Understanding Biomolecules: Nutritional Building Blocks
D
Daniel
@daniel_rrww5
1 / 4
Food Components and Chemical Elements
Your body is basically a complex chemistry set, and food provides the raw materials for every reaction happening inside you right now. Food does three main jobs: gives you energy to move and think, helps build new cells as you grow, and repairs damaged tissue when you get hurt.
All food comes down to just 11 chemical elements working together. The big six are carbon (C), hydrogen (H), oxygen (O), nitrogen (N), phosphorus (P), and sulphur (S). Then you've got your salts like sodium (Na) and calcium (Ca), plus trace elements like iron (Fe) that you need in tiny amounts but are absolutely crucial.
These elements combine in different ways to create the six main food components: water, carbohydrates, lipids, proteins, vitamins, and minerals. Think of it like LEGO blocks - same basic pieces, endless combinations.
Carbohydrates are your body's favourite energy source, made from carbon, hydrogen, and oxygen. There are three types: monosaccharides (simple sugars like glucose in fruit), disaccharides (double sugars like lactose in milk), and polysaccharides (complex carbs like starch in bread and pasta).
Remember: Carbohydrates always have twice as many hydrogen atoms as oxygen atoms - that's the CX(H2O)Y formula in action!
Carbohydrates, Lipids, and Proteins
Carbohydrates aren't just for energy - they're also building materials. Cellulose forms plant cell walls, whilst chitin makes up insect shells and fungal cell walls. Your body breaks down carbs during respiration to release the energy stored in those chemical bonds.
Lipids (fats and oils) are the misunderstood heroes of nutrition. Made from carbon, hydrogen, and oxygen, they include everything from the butter on your toast to the cholesterol your body actually needs. Triglycerides (three fatty acids plus glycerol) store energy, whilst phospholipids help build cell membranes.
Lipids do loads more than you'd think: they insulate your body like biological bubble wrap, waterproof your skin, cushion vital organs, and help your nerve cells send messages properly. The fat around your kidneys isn't just sitting there - it's protective padding.
Proteins are the workhorses of your body, containing carbon, hydrogen, oxygen, and nitrogen. They're made from chains of amino acids linked by peptide bonds. There are 20 common amino acids that combine in countless ways - like a biological alphabet creating different "words."
Fun fact: Every single enzyme in your body is a protein, which means proteins control virtually every chemical reaction keeping you alive!
Proteins, Vitamins, and Metabolism
Proteins have two main roles: structural (building stuff) and metabolic (controlling reactions). Keratin makes your hair and nails strong, myosin powers your muscles, and enzymes like chlorophyll capture sunlight during photosynthesis.
Your body constantly runs two types of reactions: anabolic reactions use energy to build large molecules from small ones (like photosynthesis making glucose), whilst catabolic reactions break down large molecules to release energy (like respiration and digestion). Think building up versus breaking down.
Vitamins are organic molecules that plants make but animals need from their diet. They're either fat-soluble (A, D, E, K) or water-soluble (B, C). Vitamin C builds connective tissue - the biological "glue" holding your body together. Get it from citrus fruits and leafy greens, or risk scurvy with bleeding gums and loose teeth.
Vitamin D helps you absorb calcium for strong bones and teeth. Your skin makes it from sunlight, or you can get it from dairy, fish, and eggs. Without enough, kids get rickets (soft, bent bones) and adults get weak, calcium-depleted bones.
Smart tip: Remember fat-soluble vitamins (A, D, E, K) with "ADEK" - these get stored in your body fat, whilst water-soluble ones (B, C) get flushed out regularly!
Minerals and Water
Minerals are basically salts that your body needs in tiny amounts but can't function without. Plants absorb them through roots: calcium and magnesium help make chlorophyll green, nitrates build proteins, and phosphates create ATP (your cellular energy currency) and DNA.
Animals get minerals from food. Calcium builds bones and teeth, iron makes haemoglobin carry oxygen in red blood cells, and sodium controls how much water your cells hold. It's like having the right ingredients for different biological recipes.
Water might seem boring, but it's absolutely essential. It heats up and cools down slowly, keeping your body temperature steady at 37°C. When you sweat, water absorbs loads of heat as it evaporates, cooling you down naturally.
Water's also the ultimate multitasker: it dissolves nearly everything (universal solvent), transports substances in blood and plant sap, provides the liquid environment where metabolism happens, and even participates directly in photosynthesis and respiration reactions.
Did you know: Water controls your cell shape and helps move materials in and out of cells - without it, you'd literally fall apart at the cellular level!
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
Where can I download the Knowunity app?
You can download the app in the Google Play Store and in the Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
Most popular content in Biology
Can't find what you're looking for? Explore other subjects.
Students love us — and so will you.
4.6/5
App Store
4.7/5
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
Understanding Biomolecules: Nutritional Building Blocks
D
Daniel
@daniel_rrww5
Ever wondered what's actually in the food you eat and why your body needs it? Food isn't just fuel - it's made up of six essential components that keep every cell in your body working properly, from giving you energy... Show more
Food Components and Chemical Elements
Your body is basically a complex chemistry set, and food provides the raw materials for every reaction happening inside you right now. Food does three main jobs: gives you energy to move and think, helps build new cells as you grow, and repairs damaged tissue when you get hurt.
All food comes down to just 11 chemical elements working together. The big six are carbon (C), hydrogen (H), oxygen (O), nitrogen (N), phosphorus (P), and sulphur (S). Then you've got your salts like sodium (Na) and calcium (Ca), plus trace elements like iron (Fe) that you need in tiny amounts but are absolutely crucial.
These elements combine in different ways to create the six main food components: water, carbohydrates, lipids, proteins, vitamins, and minerals. Think of it like LEGO blocks - same basic pieces, endless combinations.
Carbohydrates are your body's favourite energy source, made from carbon, hydrogen, and oxygen. There are three types: monosaccharides (simple sugars like glucose in fruit), disaccharides (double sugars like lactose in milk), and polysaccharides (complex carbs like starch in bread and pasta).
Remember: Carbohydrates always have twice as many hydrogen atoms as oxygen atoms - that's the CX(H2O)Y formula in action!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Carbohydrates, Lipids, and Proteins
Carbohydrates aren't just for energy - they're also building materials. Cellulose forms plant cell walls, whilst chitin makes up insect shells and fungal cell walls. Your body breaks down carbs during respiration to release the energy stored in those chemical bonds.
Lipids (fats and oils) are the misunderstood heroes of nutrition. Made from carbon, hydrogen, and oxygen, they include everything from the butter on your toast to the cholesterol your body actually needs. Triglycerides (three fatty acids plus glycerol) store energy, whilst phospholipids help build cell membranes.
Lipids do loads more than you'd think: they insulate your body like biological bubble wrap, waterproof your skin, cushion vital organs, and help your nerve cells send messages properly. The fat around your kidneys isn't just sitting there - it's protective padding.
Proteins are the workhorses of your body, containing carbon, hydrogen, oxygen, and nitrogen. They're made from chains of amino acids linked by peptide bonds. There are 20 common amino acids that combine in countless ways - like a biological alphabet creating different "words."
Fun fact: Every single enzyme in your body is a protein, which means proteins control virtually every chemical reaction keeping you alive!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Proteins, Vitamins, and Metabolism
Proteins have two main roles: structural (building stuff) and metabolic (controlling reactions). Keratin makes your hair and nails strong, myosin powers your muscles, and enzymes like chlorophyll capture sunlight during photosynthesis.
Your body constantly runs two types of reactions: anabolic reactions use energy to build large molecules from small ones (like photosynthesis making glucose), whilst catabolic reactions break down large molecules to release energy (like respiration and digestion). Think building up versus breaking down.
Vitamins are organic molecules that plants make but animals need from their diet. They're either fat-soluble (A, D, E, K) or water-soluble (B, C). Vitamin C builds connective tissue - the biological "glue" holding your body together. Get it from citrus fruits and leafy greens, or risk scurvy with bleeding gums and loose teeth.
Vitamin D helps you absorb calcium for strong bones and teeth. Your skin makes it from sunlight, or you can get it from dairy, fish, and eggs. Without enough, kids get rickets (soft, bent bones) and adults get weak, calcium-depleted bones.
Smart tip: Remember fat-soluble vitamins (A, D, E, K) with "ADEK" - these get stored in your body fat, whilst water-soluble ones (B, C) get flushed out regularly!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Minerals and Water
Minerals are basically salts that your body needs in tiny amounts but can't function without. Plants absorb them through roots: calcium and magnesium help make chlorophyll green, nitrates build proteins, and phosphates create ATP (your cellular energy currency) and DNA.
Animals get minerals from food. Calcium builds bones and teeth, iron makes haemoglobin carry oxygen in red blood cells, and sodium controls how much water your cells hold. It's like having the right ingredients for different biological recipes.
Water might seem boring, but it's absolutely essential. It heats up and cools down slowly, keeping your body temperature steady at 37°C. When you sweat, water absorbs loads of heat as it evaporates, cooling you down naturally.
Water's also the ultimate multitasker: it dissolves nearly everything (universal solvent), transports substances in blood and plant sap, provides the liquid environment where metabolism happens, and even participates directly in photosynthesis and respiration reactions.
Did you know: Water controls your cell shape and helps move materials in and out of cells - without it, you'd literally fall apart at the cellular level!
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
Where can I download the Knowunity app?
You can download the app in the Google Play Store and in the Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
1
Smart Tools NEW
Transform this note into: ✓ 50+ Practice Questions ✓ Interactive Flashcards ✓ Full Practice Test ✓ Essay Outlines
Practice Test
Quiz
Flashcards
Essay
Most popular content in Biology
Can't find what you're looking for? Explore other subjects.
Students love us — and so will you.
4.6/5
App Store
4.7/5
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user